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LAGRANGE LAser GRavitational-wave ANtenna at GEo-lunar L3, L4 , L5 John W. Conklin for the LAGRANGE team Information contained herein is not subject to Export Control or ITAR
58

Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Dec 22, 2020

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Page 1: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

ELA

ser

GR

avit

atio

nal-w

ave

AN

tenn

aat

GE

o-lu

nar

L3, L

4 , L

5

John

W. C

onkl

info

r th

e LA

GR

AN

GE

tea

m

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 2: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

2

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

The

SALK

S C

olla

bora

tion

Sta

nfor

dN

ASA

AR

CL o

ckhe

ed

Mar

tinK

AC

ST o

fSa

udi A

rabi

aS

RI

Inte

rnat

iona

lsc

ienc

epa

yloa

d le

ad

(GR

S / I

MS)

scie

nce

orbi

t, or

b. in

ject

ion,

pr

op. m

od.

tele

scop

e,

spac

ecra

ftsc

ienc

e pa

yloa

d,

tech

dev

elop

men

tμN

thru

ster

s

John

Con

klin

Kar

thik

Bal

akris

hnan

Chi

n Sa

n H

an

BJ

Jaro

uxG

opal

Vasu

deva

nVi

ctor

Agu

ero

Page 3: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

3

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Des

ign

Ove

rvie

w•

3 id

entic

al d

rag-

free

spa

cecr

aft &

pay

load

s

•St

able

geo

cent

ric o

rbit

(EM

L3,

L4,

L5)

•67

0,00

0 km

equ

ilate

ral t

riang

le (6

link

s)

•M

inim

um c

ompl

exity

•1

sphe

rical

TM

per

S/C

•1

lase

r & b

ench

per

S/C

•2

tele

scop

es, i

n-fie

ld p

oint

ing

•7

DoF

cont

rol p

er s

pace

craf

t

•Fl

ight

pro

ven

tech

with

hig

h TR

L(H

oney

wel

l gyr

o, D

ISC

OS,

GP-

B, L

ISA

)

•C

ontin

uous

, sim

ulta

neou

s, fa

st c

omm

•Fi

xed

ante

nnas

on

each

S/C

•M

bps

thro

ugh

NA

SA G

N (1

1 m

cla

ss),

~1 h

our d

ata

late

ncy

•C

ritic

al fo

r mis

sion

suc

cess

(GP-

B, L

IGO

)

•5

year

mis

sion

life

time

Page 4: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

4

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Prin

cipa

l Cos

t Sa

ving

s R

elat

ive

to L

ISA

1.R

educ

ed S

/C m

ass

from

redu

ced

payl

oad

com

pone

nts

•1

GR

S, 1

Las

er, 1

opt

ics

benc

h, s

mal

ler (

20 c

m) t

eles

cope

s•

2 La

sers

bud

gete

d fo

r red

unda

ncy

(4 in

LIS

A)

•N

o cr

edib

le T

M fa

ilure

mec

hani

sm•

TM s

ensi

ng, c

harg

e co

ntro

l, sp

in-u

p, a

nd d

rag-

free

hav

e re

dund

ancy

•La

unch

mas

s sa

ving

s: ~

150

kg ×

3 sp

acec

raft

2.O

rbit

chan

ge: G

eoce

ntric

, 667

,000

km

arm

leng

th•

Req

uire

s 1

smal

l pro

puls

ion

mod

ule

inst

ead

of 3

•La

unch

mas

s sa

ving

s: ~

2,5

00 k

g

•R

educ

ed o

pera

tions

& c

omm

unic

atio

ns c

ompl

exity

•LA

GR

AN

GE

wet

laun

ch m

ass:

~2,

000

kg (~

5,00

0 kg

for L

ISA

)•

His

toric

tren

ds s

how

cos

t sca

les

with

mas

s

•Sa

ve ~

$150

M in

laun

ch a

lone

Page 5: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E St

rain

Sen

siti

vity

•A

rm le

ngth

: 670

,000

km

•M

etro

logy

: 8 p

m/H

z1/2

at 3

mH

z(s

ee A

PPEN

DIX

D)

•A

ccel

erat

ion

nois

e: 3×1

0–15

m/s

ec2

•M

ust b

e ov

er-d

esig

ned

•Se

nsiti

vity

2x

less

than

LISA

bel

ow 2

0 m

Hz

•B

elow

2 m

Hz

gala

ctic

bina

ry c

onfu

sion

set

s lim

it

•LA

GR

AN

GE

mai

ntai

nsm

ost i

mpo

rtan

t sci

ence

obje

ctiv

es o

f LIS

A

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 6: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

6

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Orb

it S

elec

tion

•C

omm

unic

atio

ns (&

cos

t) dr

ives

dec

isio

n fo

r geo

cent

ric o

rbit

•~

3 st

able

, nea

r-Ea

rth

orbi

ts fo

und

1.H

igh

retr

ogra

de: ~

600,

000

km fr

om E

arth

(Hel

lings

, OM

EGA

199

8)

2.Ea

rth-

moo

n L3

, L4,

L5:

384

,000

km

from

Ear

th (L

AG

RA

NG

E)

3.Ea

rth-

Sun

L2 c

ircul

ar H

alo:

~1.

5 M

kmfr

om E

arth

(mus

t be

chec

ked)

•1.

& 2

. hav

e si

mila

r per

form

ance

(ran

ge ra

te, b

reat

hing

, etc

.)

•EM

L3,

L4,

L5

chos

en b

ecau

se:

•C

lose

st to

Ear

th

•M

inim

um c

ruis

e tim

e

•La

unch

to W

eak

Stab

ility

Bou

ndar

y: 4

mon

ths

with

∆v

= 58

0 m

/sec

•La

unch

to T

rans

-Lun

ar In

ject

ion:

7 m

onth

s w

ith∆

v =

475

m/s

ec

Page 7: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

7

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Orb

it P

erfo

rman

ce S

umm

ary

•In

itial

con

ditio

ns m

axim

ize

time

each

S/C

rem

ains

at L

-poi

nt•

Stat

ion

keep

ing

ever

y 6-

12 m

onth

s (L

3)

•St

atio

n ke

epin

g ca

pabi

lity

reco

mm

ende

d fo

r any

orb

it

•3

S/C

sim

ulta

neou

s op

timiz

atio

n m

ay im

prov

e pe

rfor

man

ce•

e.g.

syn

chro

nous

per

iodi

c or

bits

EM L

3,L4

,L5

LISA

Arm

leng

th0.

67 G

m5

Gm

∆ar

m le

ngth

≤5%

1%B

reat

hing

ang

le≤±5

deg

±0.5

deg

Ran

ge ra

te≤

150

m/s

ec10

m/s

ec∆

orbi

t pla

ne5

deg

60 d

eg

(see

AP

PE

ND

IX B

)

Page 8: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

8

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Inte

rfer

omet

ric

Mea

sure

men

t Sy

stem

•IM

S fo

llow

s LI

SA s

chem

e w

ith s

ome

diffe

renc

es

•1

W N

d:YA

G(1

064

nm),

split

to fe

ed b

oth

arm

s

•Sp

lit in

terf

erom

etry

: lon

g-ar

m /

shor

t-arm

inte

rfer

omet

ers

•Sh

ort-a

rm (T

M to

opt

ics

benc

h): M

iche

lson

or g

ravi

ty F

abry

-Pér

otca

vity

•Lo

ng-a

rm (o

ptic

s be

nch

to re

mot

e op

tics

benc

h): l

ocal

& re

ceiv

ed la

ser p

hase

di

ffere

nce

(PB

S or

diff

ract

ion

grat

ing)

•La

ser p

re-s

tabi

lizat

ion

by o

ptic

al c

avity

or i

odin

e ce

ll

•Si

ngle

TM

requ

ires

no b

ack-

link→

4 ph

ase

mea

sure

men

ts (6

for L

ISA

)

•15

0 M

Hz

Dop

pler

freq

uenc

y

•R

equi

res

mod

ified

LIS

A p

hase

met

er

•A

ltern

ate:

freq

uenc

y sh

ift lo

w-p

ower

loca

l bea

m w

ith A

OM

(or E

OM

)•

Req

uire

s cl

ock

with

~10

–14

accu

racy

(e.g

. spa

ce q

ualif

ied

H m

aser

)

•6 μr

adpo

int-a

head

ang

le: L

ISA

PA

AM

(TR

L 4)

Page 9: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

9

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

LISA

-like

Opt

ical

Ben

ch

Poss

ibly

re

plac

e w

ith

grat

ing

Page 10: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Inte

rfer

omet

ryw

ith

a D

iffra

ctio

n G

rati

ng•

Dou

ble

side

d di

ffrac

tion

grat

ing

on lo

w C

TE m

ater

ial

•Sm

all,

~ m

m re

lay

regi

on b

etw

een

long

& s

hort

arm

inte

rfer

omet

ers

•C

TE <

dn/

dT

•Fe

wer

com

pone

nts →

smal

ler o

ptic

s be

nch

•Se

nsiti

vity

to g

ratin

g m

otio

n: 1

μcy

cle/

pm (s

imila

r to

LISA

req.

)

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 11: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

11

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Tele

scop

e D

esig

n•

20 c

m a

pert

ure

•±2

.5 d

eg b

eam

ste

erin

g

•5

pm p

ath-

leng

th s

tabi

lity

•C

ompo

site

met

erin

g st

ruct

ure

•O

ff-ax

is, 2

-sta

ge d

esig

n

•St

age

one

is 6

:1 3

-mirr

orA

nast

igm

at

•Le

ads

to ±

15 d

eg s

teer

ing

mirr

or n

ear e

xit p

upil

•m

Kte

mpe

ratu

re c

ontr

ol

•O

ff-ax

is T

MA

TR

L9

•m

Kte

mp

cont

rol,

low

CTE

com

posi

te, p

m p

ath

leng

th c

ombo

TR

L 4

Stag

e O

ne D

esig

n

Page 12: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

12

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Adv

anta

ges

of a

Sph

eric

al G

RS

1.N

o TM

forc

ing

or to

rqui

ng•

Nei

ther

ele

ctro

stat

ic s

uppo

rt n

or c

apac

itive

sen

sing

requ

ired,

redu

cing

di

stur

banc

es &

com

plex

ity

2.La

rge

gap

(35

mm

)•

Dis

turb

ance

s re

duce

d an

d/or

spa

cecr

aft r

equi

rem

ents

rela

xed

3.A

long

flig

ht h

erita

ge•

Hon

eyw

ell g

yros

, Tria

d I (

5×10

–11

m/s

ec2 ),

GP-

B (4

×10–1

1m

/sec

2 H

z1/2 )

4.Sc

alab

ility

•Pe

rfor

man

ce c

an b

e sc

aled

up

or d

own

by a

djus

ting

TM a

nd g

ap s

ize

5.Si

mpl

icity

•N

o cr

oss

coup

ling

of d

egre

es o

f fre

edom

6.Si

mpl

e fli

ght-p

rove

n ca

ging

mec

hani

sm (D

ISC

OS)

Page 13: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

13

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Mod

ular

Gra

vita

tion

al R

efer

ence

Sen

sor

Page 14: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

14

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

LAG

RA

NG

E Te

st M

ass

•Te

st m

ass:

70%

/30%

Au/

Pt (L

ISA

)•

Alte

rnat

e: B

ergl

ide

(2%

/97.

5%/0

.5%

Be/

Cu/

Co)

•Sp

inni

ng (3

-10

Hz)

ave

rage

all

but

axis

ymm

etric

irreg

ular

ities

•O

ut-o

f-pla

ne m

otio

n →

patc

h le

ngth

cha

nges

1 pm

/Hz1/

2at

1 m

Hz

(see

APP

END

IX E

)

•H

ollo

wed

out

sec

tions

(∆I/I

= 0.

1)sh

iftpo

lhod

eto

0.3

-1 H

z (A

PPEN

DIX

E)

•M

C d

eter

min

ed to

IFO

lim

it by

not

chin

g sp

in +

har

mon

ics

•C

arbi

de c

oate

d (e

.g. S

iC, Z

rC)

•H

ard

(no

stic

king

), re

flect

ive,

con

duct

ive,

allo

ws

UV

char

ge c

ontr

ol,

mea

sure

d pa

tche

s co

nsis

tent

or b

ette

r tha

n go

ld (A

PPEN

DIX

E)

r

0.2 r

20°

0.2

r

I 3

Opt

imal

geo

met

ry

Page 15: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

15

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Mic

rone

wto

nTh

rust

ers

•D

rag-

free

& a

ttitu

de v

ia μ

N th

rust

ers

•N

o ex

istin

g th

rust

er m

eets

LIS

A n

oise

,m

ax th

rust

and

life

time

requ

irem

ents

•N

GO

eva

luat

ing

alte

rnat

es to

FEE

Ps

•SR

I mic

ro-fa

bric

ated

ion

thru

ster

attr

activ

e al

tern

ate

to B

usek

CM

NT

or It

alia

n/A

ustr

ian

FEEP

s•

Mic

ro-fa

bric

ated

em

issi

on s

ites

prod

uce

ions

& e

lect

rons

•“D

igita

l pro

puls

ion”

: 100

’s –

1,00

0’s

of in

depe

nden

t em

itter

s / c

m2

•Si

ngle

uni

t can

pro

duce

forc

es +

torq

ues

•H

uge

dyna

mic

rang

e: io

n pr

oduc

tion

phys

ics

unch

ange

d ov

er 1

0–9to

1 N

•U

p to

10,

000

sec

Isp

•Pr

otot

ype:

1 n

Nto

5 μ

N th

rust

er io

n so

urce

test

ed to

40

hr o

f ope

ratio

n

•C

an b

e de

mon

stra

ted

on a

1U

Cub

eSat

Page 16: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Acc

eler

atio

n N

oise

Bud

get

•70

mm

dia

mA

uPts

pher

e, 3

5 m

m g

ap•

Man

y te

rms ∝

gap–1

, gap

–2

•R

equi

rem

ents

rela

xed

w.r.

t. LI

SA

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 17: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

17

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Spac

ecra

ft &

Mis

sion

Des

ign

•S/

C b

ased

on

exis

ting

LM S

/C, T

RL

>6•

~3 m

×0.

7 m

, 300

kg,

500

W

•Fi

xed

10 W

ant

enna

bet

wee

n te

lesc

opes

•Th

erm

al d

esig

n: G

RS

10 μ

K a

t 1 m

Hz

•±5

0 K

at e

xter

ior a

t 27.

3 pe

riod

•Th

erm

al lo

ad ra

diat

ed to

p/bo

ttom

•Pa

yloa

d at

cen

ter

•La

unch

mas

s: 2

,070

kg

•4-

7 m

onth

cru

ise

•5

year

life

time

•$9

50M

FY1

2

Page 18: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

18

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

1st Te

ch D

emo

on n

ano/

mic

ro S

ats:

UV

LED

Sat

•St

anfo

rd: P

aylo

ad

•16

UV

LED

s(4

diff

eren

t typ

es)

•El

ectr

omet

er

•B

ias

plat

es

•A

ctiv

e ac

cha

rge

cont

rol

•N

ASA

AR

C:

•Sy

stem

s en

gine

erin

g,in

tegr

atio

n &

test

ing

•K

AC

ST:

•S/

C b

us, l

aunc

h, o

ps

•Fl

ight

pay

load

: Mar

. 201

2

•La

unch

: 201

3

Low

cos

t, ~2

yr →

TRL

9

Page 19: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Engi

neer

ing

Uni

t

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 20: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

20

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(1/5

)1.

The

max

imum

one

-way

Dop

pler

is ~

150

MH

z, m

akin

g th

e ro

und

trip

~30

0 M

Hz.

H

ow d

o yo

u pl

an to

han

dle

this

?

Phas

e at

rem

ote

S/C

not

nec

essa

rily

re-

tran

smitt

ed. H

eter

odyn

e on

bot

hS/

C ~

150

MH

z. P

hase

met

erm

od o

r fr

eque

ncy

shift

loca

l las

er.

2.LI

SA re

quire

s a

fairl

y so

phis

ticat

ed

cloc

k no

ise

corr

ectio

n sy

stem

. To

mee

t yo

ur le

ngth

sen

sing

requ

irem

ents

with

th

ese

Dop

pler

freq

uenc

ies,

this

wou

ld

have

to b

e re

scal

ed. D

id y

ou lo

ok in

to

this

?

Yes,

it is

in o

ur b

udge

t. R

esid

ual c

lock

no

ise ∝

Dop

pler

freq

uenc

y.

LAG

RA

NG

E D

oppl

er is

10x

LIS

A.

Red

uced

sho

t noi

se h

elps

a b

it.

LAG

RA

NG

E cl

ock

nois

e =

3 pm

/Hz–

1/2

at 3

mH

z(L

ISA

~ 0

.4 p

m/H

z–1/

2 )

3.H

ave

you

look

ed a

t pat

h le

ngth

sta

bilit

y of

the

tele

scop

e?Ye

s, L

M a

naly

zed

path

leng

th s

tabi

lity

w.r.

t. te

mpe

ratu

re c

hang

e &

ste

erin

g.

4.D

oes

the

tele

scop

e ne

ed a

focu

s m

echa

nism

to c

ompe

nsat

e fo

r de-

wat

erin

g of

the

com

posi

te m

eter

ing

stru

ctur

e?

Yes.

Page 21: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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RA

NG

E, 2

0 D

ecem

ber

2011

21

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(2/5

)

5.Th

e an

gula

r var

iatio

ns a

re +

/-5

deg

betw

een

S/C

. The

tele

scop

e re

duce

s th

e be

am s

ize

by

a fa

ctor

of 6

but

als

o in

crea

ses

the

angu

lar

varia

tions

by

a fa

ctor

of 6

, req

uirin

g +/

-30

deg

of a

ngul

ar a

ctua

tion.

Are

you

pro

posi

ng to

us

e 2

mirr

ors

actu

atin

g by

+/-

15 d

eg to

co

rrec

t for

this

?

Tele

scop

e ra

nge

is ±

2.5

deg,

and

st

eerin

g is

han

dled

by

a si

ngle

m

irror

. (se

e C

hart

11)

6.D

o th

e te

lesc

ope

and

in-fi

eld

guid

ing

syst

em

requ

ire a

n ad

ditio

nal i

nter

fero

met

er to

read

ou

t the

ir le

ngth

cha

nges

?

Met

erin

g st

ruct

ure

tem

pera

ture

co

ntro

lled

to m

Kle

vel,

and

OPD

ca

libra

ted

as a

func

tion

of fi

eld,

al

low

ing

one

to o

pera

te w

ithou

t ac

tivel

y tr

acki

ng O

PD a

t pm

le

vel.

Inte

rnal

mon

itorin

g sy

stem

cou

ld b

e us

ed, b

ut a

t th

e co

st o

f add

ition

al p

ower

, w

eigh

t, co

st, c

ompl

exity

.

Page 22: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

22

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(3/5

)

7.Ty

pica

lly a

mea

sure

men

t tel

esco

pe is

so

mew

hat d

iffer

ent f

rom

an

imag

ing

tele

scop

e. Y

ou'v

e id

entif

ied

a Th

ree

Mirr

or

Ana

stig

mat

with

flig

ht h

erita

ge, b

ut d

o yo

u ha

ve te

sts

to s

how

that

it m

eets

the

optic

al

path

leng

thre

quire

men

ts a

nd a

ll ot

her

perf

orm

ance

and

env

ironm

enta

l req

uire

men

ts

at T

RL

9?

Off-

axis

TM

A is

TR

L 9.

mK

tem

p co

ntro

l, lo

w C

TE c

ompo

site

te

lesc

ope,

pm

pat

h le

ngth

m

onito

ring

have

flig

ht

qual

ifica

tion

test

her

itage

. C

ombi

natio

n of

all

thre

e is

new

an

d is

con

side

red

TRL

4.(s

ee A

PPEN

DIX

A)

8.C

an y

ou c

omm

ent h

ow y

ou e

nvis

ion

that

the

typi

cal m

illira

dian

stee

ring

rang

e of

AO

Ms

and

EOM

s ca

n be

incr

ease

d to

the

requ

ired

leve

ls?

Ref

eren

ce 5

5 st

ates

that

max

imum

de

flect

ion

angl

es o

f 0.1

° are

pos

sibl

e us

ing

375V

in a

n 11

cm lo

ng a

nd 2

mm

wid

e cr

ysta

l.

Not

bas

elin

e de

sign

. C

omm

erci

ally

ava

ilabl

e pr

oduc

ts h

ave

larg

er ra

nge,

but

m

ay s

till n

eed

mag

nific

aito

n.

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NG

E, 2

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ecem

ber

2011

23

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(4/5

)

9.Th

e gr

atin

g re

adou

t will

be

very

sen

sitiv

e to

an

gula

r mot

ion

and

late

ral d

ispl

acem

ent o

f th

e gr

atin

g. S

ee P

RL

95, 0

1390

1 (2

005)

for a

m

easu

rem

ent o

f how

the

inte

rfer

omet

ricsi

gnal

in a

Mic

hels

on in

terf

erom

eter

cha

nges

w

hen

the

grat

ing

is tr

ansl

ated

. Did

you

co

nsid

er th

is in

you

r ana

lysi

s?

Sens

itivi

ty to

spo

t mot

ion

over

gr

atin

g su

rfac

e is

1 μ

cycl

e/pm

, eq

uiva

lent

to L

ISA

opt

ical

be

nch

defo

rmat

ion

requ

irem

ents

. Affe

ct o

f sph

ere’

s m

otio

n w

.r.t.

Littr

owca

vity

mus

t be

ana

lyze

d in

det

ail.

10.

A s

pher

ical

met

allic

pro

of m

ass

has

had

figur

e/C

G is

sues

in th

e pa

st. H

ave

thes

e be

en

reso

lved

?

Path

-leng

th c

hang

es d

ue to

sp

here

form

/MC

~ 1

pm

.Se

e ch

art 1

4, A

PPEN

DIX

E.

11.

Are

the

prop

osed

car

bide

coa

tings

con

sist

ent

with

the

expe

cted

sur

face

and

pat

ch fi

eld

requ

irem

ents

?

Yes,

40%

bet

ter t

han

gold

whe

n cl

ean.

How

ever

, mea

sure

men

ts

show

pat

ches

dom

inat

ed b

y co

ntam

inat

ion.

See

char

t 14,

APP

END

IX E

.

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2011

24

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Res

pons

es t

o Q

uest

ions

(5/5

)12

.Th

e ki

netic

ene

rgy

of th

e pr

oof m

ass

is

take

n ou

t by

boun

cing

the

proo

f mas

s in

side

the

hous

ing

with

initi

ally

mm

/s

velo

citie

s. W

hat t

ests

hav

e be

en d

one

that

sho

w th

at th

is d

oes

not d

ent t

he

surf

aces

cre

atin

g pa

tche

s? T

he

shad

ow s

enso

rs, t

he g

ratin

g, a

nd th

e so

urce

s fo

r the

UV

light

will

hav

e to

be

pro

tect

ed fr

om im

pact

?

Onc

e re

leas

ed S

/C ‘c

atch

es u

p’ to

TM

. B

ounc

es n

eed

not b

e in

elas

tic. m

m/s

ec

boun

ces

sim

ilar t

o ca

refu

l han

dlin

gof

TM

pre

-laun

ch. E

last

ic li

mit

of

sphe

re’s

mat

eria

l is

not e

xcee

ded.

Any

re

sidu

al m

arks

ave

rage

d by

spi

n. P

atch

vo

ltage

s of

100

mV

in e

rror

bud

get,

boun

ding

any

pos

sibl

e pa

tche

s pr

oduc

ed o

n-or

bit.

13.

How

long

will

the

dam

ping

take

?C

aptu

re ti

me

only

func

tion

of re

leas

e ve

loci

ty a

nd m

ax th

rust

.C

aptu

re in

~1,

000

sec,

DIS

CO

S ~1

00 s

ec

14.

Hav

e yo

u lo

oked

at o

ther

con

stel

latio

n co

ncer

ns, l

ike

poin

t-ahe

ad v

aria

tions

? If

so, h

ow w

ill th

ey b

e ad

dres

sed?

Yes,

see

APP

END

IX B

15.

Expl

ain

the

crui

se p

hase

ste

ps in

mor

e de

tail.

See

APP

END

IX C

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ber

2011

25

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX A

: Mis

sion

Con

cept

Det

ails

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NG

E, 2

0 D

ecem

ber

2011

26

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

LAG

RA

NG

E / L

ISA

Com

pari

son

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RA

NG

E, 2

0 D

ecem

ber

2011

27

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Tech

nolo

gy R

eadi

ness

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RA

NG

E, 2

0 D

ecem

ber

2011

28

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Spac

ecra

ft &

Pay

load

Mas

s &

Pow

er

Page 29: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

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RA

NG

E, 2

0 D

ecem

ber

2011

29

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX B

: Sci

ence

Orb

it D

etai

ls

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NG

E, 2

0 D

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ber

2011

30

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Scie

nce

Orb

it: 3

65 d

ay s

olut

ion

-4-3

-2-1

01

23

4

x 10

5

-3-2-10123

x 10

5

x (k

m)

Ear

th-M

oon

rota

ting

fram

e ce

nter

ed a

t bar

ycen

ter

y (km)

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RA

NG

E, 2

0 D

ecem

ber

2011

31

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Scie

nce

Orb

it: 3

65 d

ay s

olut

ion

-4

-3

-2

-1

0

1

2

3

4

x 10

5

-3

-2

-1

0

1

2

3

x 10

5

-4-2024

x 10

4

y (k

m)

x (k

m)

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NG

E, 2

0 D

ecem

ber

2011

32

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Rel

ativ

e A

rm L

engt

h C

hang

es

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RA

NG

E, 2

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ecem

ber

2011

33

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Spac

ecra

ft-t

o-Sp

acec

raft

Ran

ge R

ates

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RA

NG

E, 2

0 D

ecem

ber

2011

34

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Bre

athi

ng A

ngle

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RA

NG

E, 2

0 D

ecem

ber

2011

35

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

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ort C

ontro

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Poin

t-ah

ead

Ang

le

Page 36: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

36

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Sola

r &

Lun

ar E

clip

ses

•Ec

lipse

s ov

er 3

65 d

ays

•M

axim

um E

arth

ecl

ipse

leng

th: 4

hou

rs

•M

axim

um L

unar

(par

tial)

eclip

se le

ngth

: 3 h

ours

Num

ber o

f Ecl

ipse

sL3

L4L5

Part

ial

Eclip

se2

02

Tota

l Ec

lipse

32

4

Part

ial

Eclip

se2

20

Tota

l Ec

lipse

00

0

Luna

r Ec

lipse

Eart

h Ec

lipse

Page 37: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

37

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX C

: Orb

it In

ject

ion

Det

ails

Page 38: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Orb

it In

ject

ion

Scen

ario

1: W

eak

Stab

ility

Bou

ndar

yA

.D

ay 0

: Lau

nch →

WSB

(C

3 =

0 km

2 /sec

2 )B

.D

ay 4

1: W

SB →

Luna

r sw

ingb

y(∆

V =

95 m

/s)

C.

Day

81:

Lun

ar s

win

gby→

phas

ing

orbi

t(∆

V =

83 m

/sec

)D

.D

ay 1

00:p

hasi

ng o

rbit →

EM L

5(∆

V =

42 m

/sec

)E.

Day

118

:Ren

dezv

ous

EM L

5(∆

V =

51 m

/sec

)F.

Day

137

:pha

sing

orb

it →

EM L

3(∆

V =

70 m

/sec

)G

.D

ay 1

56:R

ende

zvou

s EM

L3

(∆V

= 67

m/s

ec)

H.

Day

175

:pha

sing

orb

it →

EM L

4(∆

V =

57 m

/sec

)I.

Day

193

:Ren

dezv

ous

EM L

4(∆

V =

0 m

/sec

)•

TO

TA

L Δ

V: 4

75 m

/sec

(incl

udin

g 10

m/s

cour

se c

orre

ctio

ns)

•Ea

ch L

M s

pace

craf

t has

100

m/s

ec

prop

. sys

tem

for i

nser

tion

/ tip

-off

A

BA

ssum

ed

Laun

ch:

1 Ja

n 20

15

C, E

,G

, I

DFH

Req

uire

s 23

0 kg

bip

rop

fuel

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 39: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Orb

it In

ject

ion

Scen

ario

2: T

rans

-Lun

ar In

ject

ion

A

B

C

A.

Day

0: L

aunc

h →

TLI (C

3 =

–1.7

km

2 /sec

2 )B

.D

ay 3

: Lun

ar s

win

gby→

phas

ing

orbi

t(∆

V =

283

m/s

ec)

C.

Day

25:

pha

sing

orb

it →

EM L

5(∆

V =

42 m

/sec

)D

.D

ay 4

0: R

ende

zvou

s EM

L5

(∆V

= 51

m/s

ec)

E.D

ay 5

9: p

hasi

ng o

rbit →

EM L

3(∆

V =

70 m

/sec

)F.

Day

78:

Ren

dezv

ous

EM L

3(∆

V =

67 m

/sec

)G

.D

ay 9

7: p

hasi

ng o

rbit →

EM L

4(∆

V =

57 m

/sec

)H

.D

ay 1

15: R

ende

zvou

s EM

L4

(∆V

= 0

m/s

ec)

•T

OT

AL Δ

V: 5

80 m

/sec

(incl

udin

g 10

m/s

cour

se c

orre

ctio

ns)

•Ea

ch L

M s

pace

craf

t has

100

m/s

ec p

rop.

sy

stem

for i

nser

tion

/ tip

-off

Req

uire

s 29

7 kg

bip

rop

fuel

D

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 40: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

40

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX D

: IM

S D

etai

ls

Page 41: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

41

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Gra

ting

as

a B

eam

Spl

itte

r

Page 42: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

42

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Gra

ting

-Sph

ere

Cav

ity

•M

ode

mat

chin

g an

d st

able

low

fine

sse

cavi

ty d

emon

stra

ted

Page 43: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

43

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Phas

emet

er•

JPL

Phas

emet

er, b

ased

on

GPS

tech

(TR

L 5)

•A

ccom

mod

ate

150

MH

z he

tero

dyne

freq

uenc

y if

poss

ible

•A

ltern

ate:

freq

uenc

y sh

ift lo

cal l

aser

pic

k-of

f to

redu

ce h

eter

odyn

e fr

eq.

•A

OM

or E

OM

with

acc

urat

e sy

nthe

size

r

•~1

50 M

Hz

rang

e, μ

cycl

e ac

cura

cy →

requ

ires

H-m

aser

or e

quiv

alen

t clo

ck

•O

ne-w

ay li

ght t

rave

l tim

e: 2

.25

sec

•Po

int-a

head

ang

le: 6

±0.

5 μr

ad(s

ee A

PPEN

DIX

B)

•LI

SA P

oint

-Ahe

ad A

ngle

Mec

hani

sm s

uffic

ient

(TR

L 4)

•Pi

ezo-

actu

ated

flex

piv

ot m

irror

•80

0 μr

adra

nge,

16

nrad

/Hz1

/2an

gula

r jitt

er, 2

pm

/Hz1

/2pi

ston

jitte

r

Poin

t-ah

ead

Ang

le

Page 44: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

44

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Met

rolo

gy E

rror

Bud

get

•N

oise

is fl

at a

bove

3 m

Hz

& 1

/f2

belo

w

•Sh

ot n

oise

redu

ced

w.r.

t. LI

SA d

ue to

sho

rter

arm

(20

cm te

l.)

•R

esid

ual c

lock

noi

se ~

10 la

rger

due

to la

rger

Dop

pler

rate

Noi

se s

ourc

eN

oise

at 3

mH

z(p

m/H

z1/2 )

Shot

noi

seO

ptic

al p

ath-

leng

th c

hang

es*

Res

idua

l clo

ck

nois

eR

esid

ual l

aser

ph

ase

nois

e3

Tota

l (R

SS)

4 5 3 8*D

omin

ated

by

tele

scop

e

Page 45: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

45

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

APP

END

IX E

: MG

RS

Det

ails

Page 46: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

46

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Test

Mas

s G

eom

etry

•TM

hol

low

ed o

ut•∆

I / I

> 0.

1 →

polh

ode

> 0.

3 -1

Hz

for s

pin

= 3

-10

Hz

•D

ensi

ty lo

ss <

20%

•Sy

mm

etric

→IM

S m

odul

atio

nis

sin

usoi

dal

•Ex

tern

al g

eom

etry

requ

irem

ents

•Sp

heric

al to

< 3

0 nm

•G

P-B

, Hon

eyw

ell r

otor

~ 1

0 nm

•M

ass

unba

lanc

e <

300

nm

•G

P-B

roto

r ~ 1

0 nm

r

0.2

r

20°

0.2

r

I 3

Opt

imal

Geo

met

ry

Page 47: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Bra

ss T

M F

abri

cati

on D

emo

2-pa

rt s

pher

e (C

NC

)3-

part

sph

ere

(lath

e)

Torc

h br

aze

Lap

& p

olis

h

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 48: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

48

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Path

Len

gth

Cha

nges

due

to

Geo

met

ry•

Lapp

ing

and

polis

hing

min

imiz

es s

lope

of s

urfa

ce•

Am

plitu

de o

f sha

pe h

arm

onic

s ∝

1 / s

patia

l siz

e (l)

•La

ser s

pot a

vera

ges

harm

onic

s <

1 m

m

•Sp

in a

vera

ges

all b

utax

isym

met

richa

rmon

ics

•O

ut-o

f-pla

ne m

otio

n→

patc

h le

ngth

cha

nges

•S/

C ji

tter <

3 μ

rad/

Hz1/

2

→<

1 pm

/Hz1/

2

•O

rbit:

5°/2

7.3

days

→1

pm/H

z1/2

at 1

mH

z

•LI

SA o

rbit:

60°

/1 y

ear

→10

pm

/Hz1/

2at

0.1

mH

z

Mea

sure

d G

P-B

rot

or

LAG

RA

NG

E T

M m

odel

Page 49: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

49

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Test

Mas

s C

agin

g &

Rel

ease

•D

ISC

OS

fligh

t pro

ven

mec

hani

sm•

Jack

scr

ew h

olds

TM

aga

inst

hou

sing

•Su

cces

sful

ly d

emon

stra

ted

twic

e on

-or

bit,

2ndtim

e af

ter 6

mon

th c

agin

g

•A

fter r

elea

se, μ

N th

rust

ers

‘cat

ch u

p’w

ith in

ertia

l TM

•C

aptu

re ti

me

only

func

tion

ofre

sidu

al v

eloc

ity &

max

thru

st•

mm

/sec

bou

nces

~ h

andl

ing

on g

roun

d

•D

oes

not r

equi

re in

elas

tic c

ollis

ions

•D

ISC

OS

capt

ure

time:

~10

0 se

c•

On-

orbi

t cap

ture

mat

ched

sim

ulat

ions

•LA

GR

AN

GE:

~10

00 s

ec

DIS

CO

S

Page 50: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

50

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Diff

eren

tial

Opt

ical

Sha

dow

Sen

sor

•nm

/Hz1

/2ac

cura

cy o

ver m

Hz-

1Hz,

~m

m d

ynam

ic ra

nge

•D

emon

stra

ted

to 2

nm

/Hz1

/2at

1 H

z, 2

0 nm

/Hz1

/2at

1 m

Hz

•Li

mite

d by

env

ironm

ent,

not t

he s

enso

r

DO

SS s

chem

eD

OSS

pro

toty

pe a

t Sta

nfor

d

Page 51: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

51

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Test

Mas

s Sp

in-u

p C

oils

•B

ased

on

fligh

t pro

ven

Hon

eyw

ell G

yros

•6

Hel

mho

ltz-li

ke c

oils

•4

in o

rbit-

plan

e fo

r spi

n-up

(ac)

•2

top/

botto

m fo

r pol

hode

dam

ping

& s

pin

axis

alig

nmen

t (dc

)

•O

pen-

loop

sys

tem

(on/

off)

•Sp

in-u

p to

10

Hz

in fe

w h

ours

Hon

eyw

ell E

SG

LAG

RA

NG

E Sp

in-u

p C

oil

Page 52: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

52

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

UV

LED

Cha

rge

Con

trol

•C

harg

e co

ntro

l by

UV

phot

oem

issi

on u

sing

254

nm

line

of a

n rf

mer

cury

sou

rce

succ

essf

ully

dem

onst

rate

d on

GP-

B

•LA

GR

AN

GE:

New

er c

omm

erci

al U

V LE

Ds

(240

-255

nm

)•

Fast

-sw

itcha

ble

(> 1

00 M

Hz)

allo

win

g ac

cha

rge

man

agem

ent t

hrou

gh

sync

hron

izat

ion

with

bia

s el

ectr

ode

•10

mW

→10

μW

at 2

52 n

m

•Pa

ssiv

e ch

arge

man

agem

ent p

ossi

ble

for L

AG

RA

NG

E•

Virt

ual w

ire b

etw

een

TM a

nd S

/C (~

5 pF

capa

cita

nce)

•Sp

ace

qual

ifica

tion

com

plet

e•

Life

time:

>5

year

s

•R

adia

tion

•Sh

ake,

bak

e, s

hock

Page 53: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Test

Mas

s C

oati

ng•

Car

bide

com

pond

(e.g

. SiC

or Z

rC)

•H

ard,

con

duct

ive,

refle

ctiv

e, p

erm

its U

V ch

arge

con

trol

, mea

sure

d pa

tch

pote

ntia

ls s

imila

r to

gold

(see

APP

END

IX E

)

•C

arbi

des

appe

ar b

ette

r cho

ice

for t

est m

ass

coat

ing

•Pa

tche

s do

min

ated

by

cont

amin

atio

n

•Er

ror b

udge

t: pa

tche

s 10

0 m

V dc

, 100

μV/

Hz–1

/2(1

mH

z/ f

)[G

P-B

, Tre

nto]

Prop

erty

Au

Car

bide

sPa

tch

pote

ntia

ls in

10–

7Pa

afte

r bak

e-ou

t, 3

mm

tip

~ 10

mV

~ 6m

VPa

tch

pote

ntia

ls in

“re

gula

r env

ironm

ent”

(from

GP-

B, L

PF, C

asim

irfo

rce

exp.

, etc

)20

-80

mV

20-8

0 m

V

Har

dnes

sLo

wH

igh

“Stic

ktio

n”Lo

wH

igh

Opt

ical

refle

ctiv

ity (m

easu

red)

Hig

hH

igh

UV

Phot

oem

issi

on (e

lect

rons

/pho

ton

at 2

52 n

m)

3.4×

10–7

Au ×

(1.2

-1.9

)

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Page 54: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

LAG

RA

NG

E, 2

0 D

ecem

ber

2011

54

Info

rmat

ion

cont

aine

d he

rein

is n

ot s

ubje

ct to

Exp

ort C

ontro

l orI

TAR

Coa

ting

s Te

sted

at

Stan

ford

Nb

MoC

Au

S

iC

TaC

ZrC

TiC

Nb

Page 55: Information contained herein is not subject to Export Control ......Stable geocentric orbit (EM L3, L4, L5) •670,000 km equilateral triangle (6 links) • Minimum complexity •1

Info

rmat

ion

cont

aine

d he

rein

is n

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Info

rmat

ion

cont

aine

d he

rein

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For

Au

and

TiC

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–N

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min

a 11

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04Ti

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Alu

min

a 11

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vin

prob

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rem

ents

: inv

estig

atio

ns o

f the

pat

ch e

ffect

with

app

licat

ions

to S

T-7

and

LISA

N. A

. Rob

ertson

 et a

lClass. Q

uantum

 Grav.23

(7) p

p. 266

5‐26

80 (20

06) h

ttp://

iops

cien

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g/02

64-9

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LAG

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58

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