Kyoto Area Neutron Source Activity Kyoto Neutron Source ... · AccLab BmSci ICR KyotoUniversity UCANS-I, 2010, Aug., Beijing 100 105 1010 1015 1020 Effective thermal neutron flux

AccLab BmSci ICRKyotoUniversity

UCANS-I, 2010, Aug., Beijing

Kyoto Neutron Source Activity – Satellite Pulsed Tiny Neutron Source –

Y.Iwashita, M.Ichikawa, M.Yamada, H.Tongu, T.Nagae, T.Tanimori, H.Fujioka, K.Imai

- Kyoto University

H.M.Shimizu - KEK

Kyoto Area Neutron Source Activity – Satellite Pulsed Tiny Neutron Source –

1



Background (skipped)• Why Satellite?

• Big Facility Irony

• Flexibility, Usability, Availability, Freedom, etc.

• Education, Incubation of Ideas

• Excavation of needs, potential users

• .....

SPULTNSSatellite Pulsed Tiny Neutron Source

2



Photon Case

http://www.atomin.go.jp/atomin/high_sch/reference/radiation/radiation_light/index_05.html

Phot

on B

rillia

nce

Sun ROTARY ANODE TYPE X RAY TUBE

Medical X RAY TUBE

Spring-8 SR from BM

Spring-8 SR from Wiggler

Spring-8 SR from Soft X-ray Undulator

Spring-8 SR from Undulator

1010

:Solar Mass ~105.5 Earth

Big Facility

Tiny Source

/Pallas~1010

3





Network beyond Satellite?

Collaborations ∝ N2!!

Makes all neutronians happy!4



Hokkaido45MeV EL

Kumatori

J-PARCJRR3

Kyoto

Activity at Kyoto


UCANS-I, 2010, Aug., Beijing6





Uji Campus

8



Institute for Chemical ResearchAccelerator Laboratory

100MeV e-Linac300MeV e-SRing

7MeV p-LinacIon Ring

9



ICR 7MeV Proton LinacRFQ-2MeVDTL-7MeV

<180pps, 50µsduty <~1%

1992.8

2MeV±1%

input RF

10

L5773 x 2(L3403)





Tandem Building

Main Campus at Sakyo

12



8MV Tandem van de Graaff at Faculty of Science

Prof. T.NagaeThe spokesman.

Prof. K.Imai has retired this March.


UCANS-I, 2010, Aug., Beijingf-SANS

RadiographyDetector, device R&D

基礎物理

SANS

Old Tandem

p, 3.5MeV, Iave<0.15mA

9Be(p,n)7Li(p,n) pulsed cold neutron

(0.7-2.3)×1011 n/s7Li(p,n)8Be+γ

p (3.5MeV)

N

14



Layout as of 2010.8.13

N

10m

3.5MeV p-linac

Tandem

Fcourse

Gcourse

H course

3.5MeVp-linac

Beam Dump

VCN-f-SANS?

ProductionTarget



Specifications3.5MeV, <15mApk, <100µAave.<100Hz, <0.1ms, duty <1%, Beam Power < 0.35kWCompact（< 4m）✓ low energy✓ less shield and moderator➡ gain neutron flux

pLinac will be installed this year.Hope further progress (in budget?).

16



M.R. Hawkesworth, Neutron Radiography: Equipment and Methods,

Atomic Energy Review 15, No. 2, 169-220, 1977.R.W.Hamm, Proc. SPIE 4142 (2000) 39-47

n⋅µC-1 = n/(µA⋅s)

→ ~1011 n/s @ 0.1mAave

Neutron yield

3.5MeV x 0.1mA=350W

!!"#$%&'()'*&$+%,-'."&/01'2,%'/,3'&-&%#.'45%+"6/&'7&58'%&56+",-1)9'

!

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

Li(p,n)

Be(p,n)

Low Neutron Energy

1µC = 6x1012 p2x109 n/µC-1

→one n / 3000 p

17



100

105

1010

1015

1020

1930 1940 1950 1960 1970 1980 1990 2000 2010 2020Effe

ctiv

e th

erm

al n

eutro

n flu

x n/

cm2 /s

Chadwick

350mCiRa-Be source

Bercray 37" cyclotronCP-1

CP-2

X-10

NRXMTR NRU HFIR

HFBR

ILL

ZINP-P

WNRZINP-P'

IPNSISIS

SINQFRM-II

SNS

How weak?

KENS

J-PARC JSNS

IncubationComponent R&DFrontier Study

optics/detectors (UCN preparation)

Education Kyoto

better than1010

18

History of neutron sources. Updated from Ref. [4].



VCN-focusing-

SANS

VCN-f-SANS

using modulating PMSx lens

19



Small Angle Neutron Scattering 　

€

q =4π sinθ

λ,

d =2πq, 2θ ≈ λ

d

ki

kfq2θ

⇒Particles

1. Size(rotating radius)2. Form (sphere/clinder/…)3. Surface structure

Neutron’s features … sensitivity to light elements

e.g. H, Li, C, N, O,… ⇔ SAXS

magnetism ferro-, antiferro-, spin glass…

excitations e.g. atomic motion (vibration,

libration, diffusion,…)

20



small size sample

Cold Neutron (CN) + small θ → Very CN + large θ on-sample focusing is applicable

SANS = low q?

€

q =4π sinθ

λ

ex. q=0.031Å-1 (micell of Pluronic)

2θ[º] v[m/s] E[meV]Cold Neutron 5Å 1.41 800 3.3

Very Cold Neutron 40Å 11.3 100 0.05

VCN-f-SANS

21



rot-PMSxrotating ‒ Permanent Magnet Sextupole

€

|B |= 12g'r2,

g'; sextupole field gradient

5VCN-f-SANS

22



Inner: 18 sectionsOuter: 12 sections

Permanent Magnet sizeID=15mmOD=80mm

VCN-f-SANS rotating ‒ Permanent Magnet Sextupole

23



1.0

2.0

3.0

4.0

5.06.07.0

0 10 20 30 40 50 60

G' [T/m2] zf=2.2 @2.6m38Å

Time [ms]

60ms67-113 m/s28-48Å 1Å step

28Å

48Å y = 2.2*cos((m0/30-m1)*pi)+3...

ÉGÉâÅ[íl0.0482120.18399m1

NA0.19101ÉJÉCÇQèÊNA0.98274R

ToF methodSynchronization between rot-PMSx and pulsed VCNVCN-f-SANS

24



Well Synchronized Off Synchronization

VCN-f-SANSFocusing Test: Beam size

Caution: different scales!25



■tof length : 4790/5090mm ■optics : ø5mm - ø14mm■frequency : 16.7Hz(60ms) ■opening angle : 3ms■polarized by magnetic super mirror (by K. Andersen)■spin transport field : > 50Gauss■band width : 30 ≤λ≤ 48Å

d=2265/2565mme=100/465mm(a+b=260mm

c=2265mm(

øø

ø

Δλ/λ = 6.8±1.5%

VCN-f-SANS setup overview sample focus

26



PEO100-PPO65-PEO100 ; the water soluble triblock copolymer

0 temperature [Cº]15 30

unimer

formation of spherical micelle

loss of long range order

(disordered)

formation of gel(long range order)

4±2 28±2 51±2 70±2

Drawings : Jyotsana Lal (ANL) private communications

non-ionic polymeric surfactants

Sample: Pluronic F127 in D2O 15wt%

27



VCN-SANS results for Pluronic F127(15wt%)

28



Δq=0.001Å-1

qmin

Å-1

qmax

Å-1

VCN-SANS 100mm

0.009 0.1(0.3)

VCN-SANS465mm

0.004 0.08

SAND(IPNS)

0.007 0.5SAND 0.007 0.5

VCN-SANS 465mm 0.08

(0.3)0.10.004

VCN-SANS 100mm

0.009

VCN-SANS vs. SAND@IPNS

29



Future PlanVCN-f-SANS

30



Scaling Laws1) Lens focal strength is proportional to

(lens aperture)-2 x (lens length)2) Solid angle of the lens aperture is proportional to

(focal strength) -2

3) The total distance is scaled as (focal strength) -1

4) The focal length is proportional to (wavelength) -2

5) Rep. rate of the chopper can increase for the shorter total length .

When we use three set of the same PMSx, the total length would be 5/3m, which is less than 2m (not 5m).

VCN-f-SANS

31



Figure of MeritVCN-f-SANS

32



Concluding RemarksPL will be delivered by the end of Dec. 2010. –

Will help to enhance the neutronian's activities: Education, Incubating new ideas, etc.

PECRIS R&D is on going.(Far upstream)

f-SANS with VCN can be very short and handy.

rot-PMSx version is under investigation.

Ultra Cold Accelerator based Natural Sciencejust a poor playing words:

33



Thank you!

34



Appendix

35

Date(2010/02/19) by(H.M.Shimizu)Title(中性子源の概要)Conf(量子ビームイメージングワークショップ) At(Kyoto)

page 36

JENDL-3.2 PLOTS

10MeV

1MeV

100keV

10keV

1b

4b12b20b

70keV

300keV

2.3MeV

中性子遮蔽 (+中性子減速)cross section of 1H＋n

鉄コンクリート21cm 56cm

J-PARCで用いられている減弱距離



10-5

10-4

10-3

10-2

10-1

100

101

102

10-1 100 101 102 103 104 105 106 107

ElasticCapture

Cro

ss S

ectio

n [b

arn]

n Energy [eV]

Cross-section of H + n (from JENDL-3.3 [2]).

1MeV

20b

Date(2009/12/07) by(H.M.Shimizu)Title(小規模低速中性子源による研究展開)Conf(教室談話会) At(Kyoto)

page

Moderator

38


page

Heat Load

39


page

Beam Intensity

40

Kyoto Area Neutron Source Activity Kyoto Neutron Source ... · AccLab BmSci ICR KyotoUniversity UCANS-I, 2010, Aug., Beijing 100 105 1010 1015 1020 Effective thermal neutron flux

Documents