1. Injector/BC1 Commissioning (Jan. 2, 2007 through Aug. 31, 2007) P
Injector/BC1 Commissioning (Jan. 2, 2007 through Aug. 31, 2007) P. Emma, et al. LCLS Injector Commissioning Workshop (ICW) Oct. 9, 2006
LCLS

2. LCLS Accelerator Schematic
6 MeV
z  0.83 mm
  0.05 %
135 MeV
z  0.83 mm
  0.10 %
250 MeV
z  0.19 mm
  1.6 %
4.30 GeV
z  mm
  0.71 %
13.6 GeV
z  mm
  0.01 %
Linac-X
L =0.6 m
rf= -160
Linac-0
L =6 m rf
gun
L0-a,b
Linac-1
L 9 m
rf  -25°
Linac-2
L 330 m
rf  -41°
Linac-3
L 550 m
rf  0°
25-1a
30-8c
...existing
linac
21-3b
24-6d
21-1
b,c,d
undulator
L =130 m X
BC1
L 6 m
R56 -39 mm
BC2
L 22 m
R56 -25 mm
DL1
L 12 m
R56 0
DL2
L =275 m
R56  0
Commission in Jan. 2007
Commission in Jan. 2008
SLAC linac tunnel
research yard

3. Complete & Detailed Optics (cathode to dump)
BC2 L3
LTU
undulator
sec-21
sec-30
Full MAD files at:

4. LCLS Installation and Commissioning Time-Line
Drive-Laser Commissioning
undulator
hall ready
LTU/und. Install
First FEL Light
Drive-Laser Install
linac/BC2 Install
First Spont. Light J A S O N D J F M A M J J A S O N D J F M A M J J
2006
2007
2008
Gun/Inj./BC1 Install
(8/21 – 1/5)
Gun/Inj./BC1 Commissioning
linac/BC2 Commissioning
FEL Comm.
LTU/undulator Commissioning

5. LCLS Layout from Gun through BC1
RF Gun
L0a RF section
6 MeV
L0b RF section
62 MeV
L1 RF sections
X-band RF section
135 MeV
gun spect.
main SLAC Linac
250 MeV
injector spect.
BC1 chicane
TD11 stopper

6. LCLS Injector Commissioning Dates (’06 - ’07) (dates will likely slip)
July 24: Sector-20 ready for laser installation
Aug. 29: Laser installation complete
Dec. 18: Virtual cathode fully characterized (ready to install gun)
Dec. 19: RF gun installation starts (10 days) + pre-beam checkout + laser rate switched to 30 Hz (5 days)
Dec. 20-Jan. 1: Holidays
Jan. 2: VVS’s switched on (RF power available)
Jan. 12: First laser UV-light on cathode!
Jan. 12-Feb. 4: Electrons in GTL and gun-spect. (RF processing L0a,b, L1, LX)
Feb. 5: Beam into L0a, L0b and down to 135-MeV spect.
Feb. 20: Beam into main linac (to TD11 dump)
~June: Take beam down full linac (to SL2 stopper, 1 km distant)

7. Commissioning Definition and Strategy
All components installed, aligned, connected, and initially verified by system engineer, before commissioning starts.
Commissioning Sequence – Layered Approach (0-3)
0. Pre-Beam Checkout (tunnel, gallery, control room)
Controls/software testing, camera checks, beamline inspection, etc
Magnet polarities, cable connections, verify motion-control, etc
Beam-based Hardware and Software Checkout
Establish beam transport, RF setup, MPS/BCS tests, etc
Checkout of all BPMs, magnets, wires, screens, toroids, etc
First-Order Optics: Measurement and Correction
Steering, transmission, oscillation data, feedback setup, etc
Beta and dispersion matching, beam-base align key quads, etc
Full Beam Characterization: Measurement and Correction
Measure emittance, energy spread, distributions - correct
Measure beam sensitivities, optimize tuning, beam experiments
3-pass approach
No (serious) emittance measurements until all hardware/software checked out!

8. (detailed schedule available)
pass-1
pass-2
pass-3
pass-1
pass-2
pass-3

9. etc...

10. LCLS Injector Commissioning Day
24-Hour Cycle (7 days/week, 1/2/07 to 8/31/07, 35 total weeks)
DAY SHIFT (8:00-16:00)
1 lead physicist, 1 physicist,
1 controls eng., 1 sys. engineer,
1 LCLS operator, 1 laser operator
SWING SHIFT (16:00-24:00)
1 lead physicist, 1 physicist,
1 LCLS operator, 1 laser operator
OWL SHIFT (0:00-8:00)
1 LCLS operator,
1 laser operator ?

11. Personnel Available for LCLS Injector/BC1 Commissioning
LCLS Physicists, et al.
(2 per D/S shift)
Dave Dowell
Paul Emma
Joe Frisch
Sasha Gilevich (laser)
Cecile Limborg
Henrik Loos
Heinz-Dieter Nuhn
John Schmerge
Dave Schultz
Jim Turner
Jim Welch
Bill White (laser)
Juhao Wu
Controls eng., et al.
(1 per DAY shift)
Stephanie Allison
Mike Zelazney
Debbie Rogind
Diane Fairley
Stephen Norem
Arturo Alarcon
Doug Murray
Sergei Chevtsov
Dayle Kotturi
Patrick Krejcik
Kristi Luchini
Sheng Peng
Stephen Schuh
Till Straumann
Sys. Engineers
(1 per DAY shift)
Eric Bong
Carl Rago
Leif Eriksson
Richard F. Boyce
Jose Chan
Tim Montagne
Paul Bellomo
Antonio de Lira
Dave MacNair
Ron Akre
Accelerator, ILC, SSRL
Franz-Josef Decker
Rick Iverson
Doug McCormick
Jeff Corbett
James Safranek...
Operations
(1 per DAY & SWING shift and 2 per OWL)
Laser Operators (4-5)
Visitors ?

12. Manpower Requirements (1/2/07 - 8/31/07)
35 weeks total (1/2/07 to 8/31/07)
28 physicist shifts/week
7 controls eng. shifts/week
7 sys. engineer shifts/week
Average of 2-3 shifts/week for each physicist
Average of 1 shift/week for each sys. engineer
Average of 1/2 shift/week for each controls eng.

13. LCLS Commissioning Parameters
Value
Comments
RF rate
10-30 Hz
10 Hz in linac with possible 30-Hz rate Hz in gun during hot test
Beam rate
10 Hz e- beam as baseline – possible short term 120-Hz tests in L0-BC1
Drive-laser rate
30 Hz
120-Hz during laser commissioning – 30 Hz during e- commissioning - shutters provide lower e- rate
Bunch charge pC
depends on QE and diagnostics – some short spans at 10 pC – later in ’07 explore 1-nC
Drive-laser pulse length
10 ps fwhm
10-ps fwhm startup with possibility of 6-ps at 0.2 nC
Gun gradient
120 MV/m
Set as goal, although 110 MV/m is adequate in ‘07

14. 2007 Injector Commissioning Goals
Commissioning Readiness Review
J. Corlett
J. Lewellen
S. Schreiber

15. Issues
Controls will be mixed (SLC, Epics, Matlab) and capabilities may be limited initially (H. Shoaee)
Most High-Level Applications (emittance, bunch length, feedback) done through MATLAB as temporary solution
Many LCLS physicists not experienced with existing SLC controls
Help from operations group is essential (hopefully many are here today)

16. (see Dowell, Limborg, Loos talks)
RF Photo-Cathode Gun
Q  1 nC
f  120 Hz
G  120 MV/m
gex,y  1 mm
Dt  10 ps
I  100 A
E  6 MeV e-
spec. dipole e-
UV laser
solenoid
YAG screens
RF gun
cathode
(see Dowell, Limborg, Loos talks)

17. Injector Diagnostics YAG screen RF Gun trajectory (BPMs)
emittance (+ slice)
energy spread (+ slice)
bunch length (+ dist.)
charge (+ dark current)
YAG screen
YAG screen
YAG
screen
YAG screen
gun spectrometer
Transverse RF deflector
OTR & wire
Injector Diagnostics
OTR & wire
OTR & wire
OTR & wire
main SLAC Linac
injector spectrometer
(see Frisch, Limborg, Loos talks)
YAG
YAG & OTR

18. Bunch Length Diagnostics
Linac Through BC1
BC1 chicane
(BPM, OTR, collimator)
L1 S-Band Linac
Wire Scanners
+ OTR
TD-11
stopper
135 MeV
250 MeV
X-Band RF
Bunch Length Diagnostics
(see Frisch, Loos talks)

19. Magnet Polarities Defined and Documented
DIPOLES
QUADRUPOLES
SOLENOIDS

20. BPMs, Wire-Scanners, etc. Polarities Defined
q = 0
q = +45º
q = -45º
q = +45º
(H. Loos: screens)

21. All Magnets Measured (all steering coil ‘types’)
2 Solenoids
19 Inj. Quads
2 GTL Quads
2 BC1 Quads
3 Linac Quads
2 DL1 Dipoles
4 BC1 Dipoles
2 Spect. Bends
6 corr. types
Dipole field vs. x
Current vs. integrated field
FINT = 0.454
Solenoid eff. length
Dipole fringe field vs. z
+ field harmonics

22. Pre-Beam Tunnel Check List
etc.

23. Summary Injector commissioning starts Jan. ’07 (may slide)
Main ’07 goal is to verify full functionality of gun, injector beam-line, diagnostics, and controls, not generate full beam brightness immediately
Will need frequent linac access initially (8-16 hrs/week?) + 1 install-day per month (24-48 hrs?)
Phase-II of commissioning comes in Jan. ’08 (BC2)
Information is available at ICW site:
...under the link: “LCLS Commissioning”.