Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20061

Initial Experience with Injector Initial Experience with Injector CommissioningCommissioning

P. Emma, P. Emma, et al.et al.Facilities Advisory Committee MeetingFacilities Advisory Committee Meeting

April 16, 2007April 16, 2007

LCLSLCLShttp://www-ssrl.slac.stanford.edu/lcls/internals/commissioning/index.htmlhttp://www-ssrl.slac.stanford.edu/lcls/internals/commissioning/index.html

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20062

~45 m (150 ft)~45 m (150 ft)

RF Gun & Solenoid + YAG screensRF Gun & Solenoid + YAG screens

GunGunSpectrometerSpectrometer

L0a&L0b S-Band LinacsL0a&L0b S-Band Linacs

OTR & Wire ScannersOTR & Wire Scanners

Straight Ahead SpectrometerStraight Ahead Spectrometer

Transverse RF CavityTransverse RF Cavity

L1 S-Band LinacL1 S-Band Linac

Bunch-Compressor-1Bunch-Compressor-1(BPM, OTR, collimator)(BPM, OTR, collimator)

Wire Wire ScannersScanners

+ OTR+ OTR

Bunch Length DiagnosticsBunch Length Diagnostics

X-Band RFX-Band RFTD11TD11

stopperstopper

135 MeV135 MeV 250 MeV250 MeV

LCLSLCLS Injector Through BC1 Injector Through BC1

6 MeV6 MeV

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20063

Electron Beam Transported Electron Beam Transported to to AllAll Injector Areas Injector Areas

April 5April 5: First photo-electrons from gun (6 MeV): First photo-electrons from gun (6 MeV)

April 5April 5: First : First ee to gun spectrometer (6 MeV) to gun spectrometer (6 MeV)

April 8April 8: First : First ee to inj-spectrometer (127 MeV) to inj-spectrometer (127 MeV)

April 9April 9: First : First ee in linac to TD11 dump (127 MeV) in linac to TD11 dump (127 MeV)

April 14April 14:: First 250-MeV beam through BC1 First 250-MeV beam through BC1

Up to ~330 pC of charge (370 Up to ~330 pC of charge (370 µµJ laser energy)J laser energy)

10 Hz beam & 30 Hz RF (30 Hz 10 Hz beam & 30 Hz RF (30 Hz ee also tested) also tested)

Gun RF feedback running well (+ water)Gun RF feedback running well (+ water)

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20064

Pre-Beam Tunnel Check List Almost CompletePre-Beam Tunnel Check List Almost Complete

etc.etc.etc.etc.

40 pages, ~2000 checks – all DONE (except a few missing screens)40 pages, ~2000 checks – all DONE (except a few missing screens)

Serial numbersSerial numbers

Polarity conventionsPolarity conventions

Installation orientationInstallation orientation

Field type (quad, dipole)Field type (quad, dipole)

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20065

RF Processing of L0b (20-8)RF Processing of L0b (20-8)

March 10March 10

March 25March 25

Thanks to R. Akre & AMRFThanks to R. Akre & AMRF

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20066

Gun Temperature Feedback LoopGun Temperature Feedback Loop

Gun Temperature

Gun RF Probes

RF On RF Off RF OnThanks Phil Cutino, Claudio Rivetta, Joe FrischThanks Phil Cutino, Claudio Rivetta, Joe Frisch

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20067

0

2

4

6

8

10

12

14

16

18

6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5

Time (microseconds)

RF

Po

we

r (M

W)

Gun FWD Power

Gun RFL Power

Gun RF Probe

1.2 1.2 µµsecsec

Gun RF Gun RF coupler coupler (input (input power)power)

Gun Reflected PowerGun Reflected Power

Gun RF Gun RF probe (cavity probe (cavity power)power)

Thanks Arnold VlieksThanks Arnold Vlieks

11 MW (~120 MV/m)11 MW (~120 MV/m)

Gun RF Power (30 Hz)Gun RF Power (30 Hz)Time laser Time laser here with here with

diodediode

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20068

Virtual Cathode (optical image of laser spot on cathode)Virtual Cathode (optical image of laser spot on cathode)

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 20069

Beam on YAG02 (80 cm from gun)Beam on YAG02 (80 cm from gun)

20 mm20 mm

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200610

Laser Phase (Shottky) ScanLaser Phase (Shottky) Scan

3030ºº

50 50 µµJ laser energyJ laser energy

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200611

Beam on Gun SpectrometerBeam on Gun Spectrometer

5.7 MeV5.7 MeV

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200612

Beam to Injector SpectrometerBeam to Injector Spectrometer

135 MeV135 MeV

BPMs worked almost immediately!BPMs worked almost immediately!

energyenergy

GUNGUN

Steering was easy with few correctors on strongSteering was easy with few correctors on strong

SDMPSDMP

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200613

Trajectory to TD11 (in main linac)Trajectory to TD11 (in main linac)

GUNGUN TD11TD11

DL1 energy BPMDL1 energy BPM

old

old

BP

MB

PM

BPMs worked almost immediately!BPMs worked almost immediately!

old

old

BP

MB

PM

BC1BC1BPMBPM

BC1 energy BPMBC1 energy BPM

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200614

L0a RF Phase Scan on Dispersed BPM L0a RF Phase Scan on Dispersed BPM XX

L0a RF phase (deg-S)L0a RF phase (deg-S)

high energyhigh energy

Spe

ct.

BP

M

Spe

ct.

BP

M XX

Rea

ding

aft

er B

end

(mm

) R

eadi

ng a

fter

Ben

d (m

m)

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200615

Bunch Charge vs. Laser EnergyBunch Charge vs. Laser Energy

calibrations need confirmationcalibrations need confirmationIris cut clips laser energyIris cut clips laser energy

330 pC330 pC

370 370 µµJ atJ atcathodecathode

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200616

EPICS Controls - VacuumEPICS Controls - Vacuum

Manual valveManual valve

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200617

EPICS Controls - MagnetsEPICS Controls - Magnets

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200618

EPICS Controls – Profile MonitorsEPICS Controls – Profile Monitors

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200619

Long Ion Chamber Along Full AcceleratorLong Ion Chamber Along Full Accelerator

YAG03 insertedYAG03 inserted YAGS2 insertedYAGS2 inserted

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200620

Charge and Position Jitter – Shot to ShotCharge and Position Jitter – Shot to Shot

100 shots at 10 Hz using BPM immediately after gun100 shots at 10 Hz using BPM immediately after gun

XX-position jitter is 10 -position jitter is 10 µµm rmsm rms

20 20 µµmm

Charge jitter is 2.6% rmsCharge jitter is 2.6% rms

2%2%

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200621

BC1 Chicane Control and CompressionBC1 Chicane Control and Compression

RF phase: RF phase: 4040ºº

RF phase: 0RF phase: 0ºº

RF phase: RF phase: 4040ºº

Ceramic Gap Bunch Length MonitorCeramic Gap Bunch Length Monitor

BC1 BC1 XX-Mover (mm)-Mover (mm)

BC

1 B

PM

B

C1

BP

M XX

(m

m)

(m

m)

OTR screen still needs cameraOTR screen still needs camera

Slope = 1Slope = 1

250 MeV250 MeVwhen when XX = 0 = 0

BPM offset checked using BC1 BPM offset checked using BC1 collimator jaws to locate beam in collimator jaws to locate beam in XX

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200622

Problems/IssuesProblems/Issues

Gun Faraday cup broken (pneumatic error)Gun Faraday cup broken (pneumatic error)

Gun toroid shorted during installationGun toroid shorted during installation

Gun Gun zz-position not right yet (7.5-mm interference)-position not right yet (7.5-mm interference)

YAG screens not setup before installation (hard-stops)YAG screens not setup before installation (hard-stops)

Still need to install cameras and air lines for 7 screensStill need to install cameras and air lines for 7 screens

No toroids working yet (1 shorted, 3 left to install)No toroids working yet (1 shorted, 3 left to install)

BC1 motion control limited (300 mm BC1 motion control limited (300 mm 260 mm) 260 mm)

QE about 4-times lower than design (to be verified)QE about 4-times lower than design (to be verified)

Some controls tools late (orbit displays & fitting)Some controls tools late (orbit displays & fitting)

MCOR power supply ADC readback noise (~1%)MCOR power supply ADC readback noise (~1%)

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200623

2007 Injector Commissioning Goals2007 Injector Commissioning Goals

http

://w

ww

-ssr

l.sla

c.st

anfo

rd.e

du/lc

ls/in

tern

als/

com

mis

sion

ing/

http

://w

ww

-ssr

l.sla

c.st

anfo

rd.e

du/lc

ls/in

tern

als/

com

mis

sion

ing/

docu

men

ts/lc

lsin

ject

or-c

omm

issi

onin

ggoa

ls.d

ocdo

cum

ents

/lcls

inje

ctor

-com

mis

sion

ingg

oals

.doc

Paul EmmaPaul Emma

LCLSLCLS FAC FAC Emma@SLAC.Stanford.eduEmma@SLAC.Stanford.edu

April 16, 2006April 16, 200624

SummarySummary

Beam transported to all areas (no trouble)Beam transported to all areas (no trouble)No obstructions or ‘backwards’ components, etc No obstructions or ‘backwards’ components, etc (but no (but no systematicsystematic checkout yet) checkout yet)Controls still developing, but working well and Controls still developing, but working well and improving fast – great cooperation and effortimproving fast – great cooperation and effortCommunication with laser group excellentCommunication with laser group excellentScreens and toroids late, but installation continuesScreens and toroids late, but installation continuesSome quality control issues with a few componentsSome quality control issues with a few componentsThanks to all – Thanks to all – First indications are very positiveFirst indications are very positive