Paul Emma LCLS FAC [email protected] April 16, 2006 1 Initial Experience with Injector...
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Transcript of Paul Emma LCLS FAC [email protected] April 16, 2006 1 Initial Experience with Injector...
Paul EmmaPaul Emma
LCLSLCLS FAC FAC [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@SLAC.Stanford.edu
April 16, 2006April 16, 200616
EPICS Controls - VacuumEPICS Controls - Vacuum
Manual valveManual valve
Paul EmmaPaul Emma
LCLSLCLS FAC FAC [email protected]@SLAC.Stanford.edu
April 16, 2006April 16, 200617
EPICS Controls - MagnetsEPICS Controls - Magnets
Paul EmmaPaul Emma
LCLSLCLS FAC FAC [email protected]@SLAC.Stanford.edu
April 16, 2006April 16, 200618
EPICS Controls – Profile MonitorsEPICS Controls – Profile Monitors
Paul EmmaPaul Emma
LCLSLCLS FAC FAC [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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 [email protected]@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