Commissioning August & September. 2 Agenda 11:20 Coffee 11:30 Introduction Sue S 11:35 Controls (an overview) Brian M 10:55 Controls & Data Acquisition.

Commissioning

August & September

2

Agenda

11:20 Coffee11:30 Introduction Sue S11:35 Controls (an overview) Brian M10:55 Controls & Data Acquisition Software Ben S12:15 RF Systems TBC12:40 Machine protection Steve B13:00 Lunch14:00 Magnets Ben S14:15 Laser Steve J14:40 Cryogenics TBC15:00 Injector Rob S 15:20 Diagnostics Rob S15:40 Coffee15:55 Vacuum Keith M16:15 Commissioning Sue S16:35 The End!!!

Speakers, please note that we have to strictly stick to

time!!!

3

Programme

• Ramp down to 100 C (5c/hr) Fri 25/7/08• HV Commissioning Monday 4/8/08

» SRS Switch off!!

• First ALICE scheduled shutdown October 08

4

GOOD

BAD

5

Gun & cathode work : Summary

• Bakeout 200 degrees (20 degrees less than usual)• HV Gun conditioning

– Aim for minimum volts for stable conditions 370kV!

• Wafer heat clean & HV tests – If FE is present, commission at reduced voltage

• Cathode activation • Cathode HV conditioning (usual 365kV)

– If the FE is present, decide what gun voltage to use (below 350kV)

• Decide on what bunch charge to use– probably ~40pC ?

6

GUN – to - BOOSTER

SOL-01

H&V-01

H&V-06BPM-01

BUNCHERYAG-01

SOL-02

H&V-02 BPM-02

7

GUN – to - BOOSTER

• Set the “commissioning” bunch charge– use QE scan results for estimates :

• SOL-01 scan– required to set SOL-01 correctly for a

given Q

• Cross -calibrate BPM-01 and YAG-01 (skip if Lifetime low)

• Set SOL-01 and SOL-02• Steer the beam to the entrance of

the booster• Set the buncher zero-crossing

phase

BOO

STER

GU

N

SOL-01

H&V-01

H&V-06BPM-01

BUNCHERYAG-01

SOL-02

H&V-02 BPM-02

8

Booster to Linac

LINAC

BOO

STER

Q-01

YAG-02 Q-02

BPM-03

H&V-03 Q-03

Q-04

YAG-03

DIP-01

Q-05

DIP-02

YAG-??

FCUP-01

BPM-04H&V-04

Q-06Q-07

Q-08Q-09

DIP-3

Q-10

YAG-04

Q-11 BPM-05H&V-05

Q-12

OTR-01BPM-01H&V-01

DIP-03

Twiss parametersEmittance

Slit here

Energy spread/spectrumAbsolute energy Buncher gradient / phase setting

Bunch charge

Setting achromaticcondition (Q01-Q05)

Twiss parametersEnergy spread

Setting achromaticcondition (Q10, Q12)

9

Booster-to-FCUP-01

• Thread the beam through booster (coarse)• Crest both cavities (coarse)

– using LLRF signals– use lower Q (10-20pC) initially

• Optimise SOL-02 setting – beam size and divergence (YAG-02)– emittance

• Set the beam on axis of the booster• Thread the beam to FCUP-01 (coarse)• Set correct Q and buncher zero-crossing phase and gradient• Crest booster cavities (fine) and set correct phases• Check electron energy and adjust cavities gradients if needed

re-adjustment of everything starting with SOL-01 may be needed• Set Q-01 to Q-04• Measure baseline beam parameters• emittance, energy spread, but not bunch length at the moment• Calibrate BPM-01 and BPM-02 against Q (procedure to develop by RF group)

Q-01

YAG-02 Q-02

BPM-03

H&V-03 Q-03

Q-04

YAG-03

DIP-01

Q-05

DIP-02

YAG-05

FCUP-01

BPM-04H&V-04

Q-06

10

The rest of the Injector : Summary

• Set DIP-01 and DIP-2 (dispersion suppression)• Thread beam through dog-leg section (coarse)• Set dog-leg section (fine); dispersion

suppression• Match the beam to main linac

– perhaps beam size and position only

• Beam measurements – probably, need none at the energy recovery stage

FCUP-01

Q-06Q-07

Q-08Q-09

DIP-3

Q-10

YAG-04

Q-11 BPM-05H&V-05

Q-12

INJECTOR ST1

ARC 2

ST4

OTR-01Q-01 Q-02 Q-03 Q-04 Q-05

YAG-03

DIP-01

Q-05

DIP-02

YAG-05

FCUP-01

BPM-04H&V-04

Q-06Q-07

Q-08

ARC 2

ST4

11

LINAC to ARC 1

LINACOTR-01

BPM-01H&V-01 OTR-02 DIP-01

DIP-02DIP-03

Q-01

OTR-03

BPM-02H&V-02

Q-02 Q-03 Q-04

OTR-04

BPM-01

DIP-03

• Beamline setup

• Linac setup

12

ARC 1

• 180 deg. bend condition• Symmetric optics in the arc• Cancellation of dispersion at the ARC1 exit

– will not be easy without BPMs; – fine tuning may need to be left for later

• R56 control (cancellation)– not now !

• Sextupole tuning – again, better be left for later

BPM-01DIP-01

BPM-02SEXT-01

OTR-01

ARC1

Q-01

V-01

Q-02

BPM-03

DIP-02

BPM-04

Q-03

V-02

Q-04

OTR-02SEXT-02

BPM-05DIP-03

BPM-06

13

ST2 & ST3

• Get the beam to OTR-01 (ST3)– no viewers over ~8m distance !!– beam divergence after the chicane is not too large – hence try to catch the beam on OTR-01 (ST3) without

quads

• Check dispersion in ST3– use OTR-01

• Estimate an energy spread on OTR-03 (ST2)• Measure Twiss parameters at the entrance to the

ARC2

ARC1

DIP-03BPM-06

OTR-01

Q-01Q-02

BPM-01H&V-01

OTR-02

Q-03Q-04

BPM-02H&V-02DIP-01

DIP-02V-03

OTR-03

DIP-03

DIP-04Q-05

ST 2ST 2

ARC 2 PLM-01TCM-01

BPM-04H&V-04

BPM-05H&V-05

BPM-01H&V-01

Q-06Q-07

WIGGLER

ST 3ST 3

Q-01Q-02

Q-03Q-04

OTR-01

BPM-02H&V-02

BPM-01DIP-01

14

ARC 2

ARC 2

BPM-01DIP-01

BPM-02SEXT-01

OTR-01

Q-01

V-01

Q-02

BPM-03

BPM-03Q-03

V-02

Q-04

OTR-02SEXT-02BPM-05

DIP-03BPM-06

15

STR 4

LINAC

YAG-04 Q-12

OTR-01BPM-01H&V-01

OTR-02SEXT-02BPM-05

OTR-01Q-01 Q-02

BPM-01H&V-01

Q-03

DUMP-01

Q-04 Q-05

BPM-02H&V-02

OTR-02DIP-01 DIP-02 DIP-03

DO NOT TOUCH !!!• 1. Get beam to OTR-2– try it with all quads OFF (by~ 60m on OTR-02)– use VCOR-02 (ARC2) and DIP-03 (ARC2)– set beam size on OTR-02 : beta ~ 6m (x) and ~10m (y) (quads to nominal; adjust if necessary)

• 2. Get beam to OTR-01 (ST1)– do not touch DIP-03– remember the hole in OTR-01 !– centre the beam on OTR-01 (ST1)

• use HVCOR-02 • note corrector settings for the beam symmetric wrt the OTR centre• set the average current in the correctors

• 3. Get beam to OTR-02 (ST1) – scan HVCOR-02 (ST4) – remember the hole !– do not use HVCOR-01 (ST1) – Setup for 8MeV beams !!!

16

Energy Recovery• AIMS:• get 180 degrees phase difference between the

outcoming and incoming beams• catch the beam in the dump• HOW:• move the ARC1

LINAC

Q-12

OTR-01BPM-01H&V-01

ST1

OTR-02 DIP-01DIP-02

DIP-03Q-01

OTR-03

BPM-02H&V-02

Q-02

DIP-02 DIP-03BPM-01

Q-01Q-02

Q-03OTR-01

DMP

1 m

Note: scale is for guidance only

17

Call the big bossOpen champagne