Injector/BC1 Commissioning
(Jan. 2, 2006 through Aug. 31, 2007)
P. Emma, et al.
Facilities Advisory Committee Meeting
Oct. 12, 2006
LCLS
http://www-ssrl.slac.stanford.edu/lcls/internals/commissioning/index.html
Oct. 12, 2006
LCLS FAC
1
Paul Emma
Emma@SLAC.Stanford.edu
LCLS Accelerator Schematic
6 MeV
z  0.83 mm
  0.05 %
4.30 GeV
z  0.022 mm
  0.71 %
Linac-1
L 9 m
rf  -25°
...existing
linac
21-1
b,c,d
DL1
L 12 m
R56 0
Linac-2
L 330 m
rf  -41°
Linac-3
L 550 m
rf  0°
21-3b
24-6d
25-1a
30-8c
X
BC1
L 6 m
R56 -39 mm
Commission in Jan. 2007
BC2
L 22 m
R56 -25 mm
Commission in Jan. 2008
SLAC linac tunnel
Oct. 12, 2006
LCLS FAC
13.6 GeV
z  0.022 mm
  0.01 %
Linac-X
L =0.6 m
rf= -160
Linac-0
L =6 m
rf
gun
250 MeV
z  0.19 mm
  1.6 %
135 MeV
z  0.83 mm
  0.10 %
2
undulator
L =130 m
DL2
L =275 m
R56  0
research yard
Paul Emma
Emma@SLAC.Stanford.edu
Complete & Detailed Optics (cathode to dump)
dump
cathode L2
BC2
L3
LTU
undulator
sec-21
sec-30
Full MAD files at: http://www-ssrl.slac.stanford.edu/lcls/linac/optics/
Oct. 12, 2006
LCLS FAC
3
Paul Emma
Emma@SLAC.Stanford.edu
LCLS Installation and Commissioning Time-Line
Drive-Laser
Commissioning
undulator
hall ready
Drive-Laser
Install
LTU/und.
Install
linac/BC2
Install
First FEL
Light
First Spont.
Light
J A SOND J FMAM J J A SOND J FMAM J J
2006
2007
2008
Gun/Inj./BC1 Gun/Inj./BC1
Install
Commissioning
(8/21 – 1/5)
Oct. 12, 2006
LCLS FAC
4
linac/BC2
FEL Comm.
Commissioning
LTU/undulator
Commissioning
Paul Emma
Emma@SLAC.Stanford.edu
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)
http://www-ssrl.slac.stanford.edu/lcls/internals/commissioning/documents/commissioning-dates-2006-2007.ppt
Oct. 12, 2006
LCLS FAC
5
Paul Emma
Emma@SLAC.Stanford.edu
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)
1. Controls/software testing, camera checks, beamline inspection, etc
2. Magnet polarities, cable connections, verify motion-control, etc
1. Beam-based Hardware and Software Checkout
Establish beam transport, RF setup, MPS/BCS tests, etc
Checkout of all BPMs, magnets, wires, screens, toroids, etc
2. First-Order Optics: Measurement and Correction
Steering, transmission, oscillation data, feedback setup, etc
Beta and dispersion matching, beam-base align key quads, etc
3. Full Beam Characterization: Measurement and Correction
Measure emittance, energy spread, distributions - correct
Measure beam sensitivities, optimize tuning, beam experiments
No (serious) emittance measurements until all hardware/software checked out!
Oct. 12, 2006
LCLS FAC
6
Paul Emma
Emma@SLAC.Stanford.edu
(detailed schedule available)
pass-1
pass-2
pass-3
pass-1
Oct. 12, 2006
LCLS FAC
pass-2
7
Paul Emma
Emma@SLAC.Stanford.edu
pass-3
http://www-ssrl.slac.stanford.edu/lcls/internals/commissioning/documents/2007-commissioning-plan.doc
Oct. 12, 2006
LCLS FAC
8
Paul Emma
Emma@SLAC.Stanford.edu
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 ?
Oct. 12, 2006
LCLS FAC
9
Paul Emma
Emma@SLAC.Stanford.edu
Personnel Available for LCLS Injector/BC1 Commissioning
Shift Leaders (initially)
(1 per D/S shift)
1. Dave Dowell
2. Paul Emma
3. Jim Turner
4. Bill White (laser)
5. Joe Frisch
6. Cecile Limborg
LCLS Physicists
(1 per D/S shift)
1. Sasha Gilevich
2. Henrik Loos
3. Heinz-Dieter Nuhn
4. John Schmerge
5. Dave Schultz
6. Jim Welch
7. Juhao Wu
Laser Operators (4-5)
Oct. 12, 2006
LCLS FAC
Controls eng.
(1 per DAY shift)
1. Stephanie Allison
2. Mike Zelazney
3. Debbie Rogind
4. Diane Fairley
5. Stephen Norem
6. Arturo Alarcon
7. Doug Murray
8. Sergei Chevtsov
9. Dayle Kotturi
10. Patrick Krejcik
11. Kristi Luchini
12. Sheng Peng
13. Stephen Schuh
14. Till Straumann
Operations
(1 per DAY & SWING
shift and 2 per OWL)
10
Sys. Engineers
(1 per DAY shift)
1. Eric Bong
2. Carl Rago
3. Leif Eriksson
4. Richard F. Boyce
5. Jose Chan
6. Tim Montagne
7. Paul Bellomo
8. Antonio de Lira
9. Dave MacNair
10. Ron Akre
Accelerator, ILC, SSRL
1. Franz-Josef Decker
2. Rick Iverson
3. Doug McCormick
4. Jeff Corbett
5. James Safranek...
Visitors ?
Paul Emma
Emma@SLAC.Stanford.edu
Manpower Requirements (1/2/07 - 8/31/07)
35 weeks total (1/2/07 to 8/31/07, minus 2 weeks)
80% coverage (downtime)
14 lead-physicist shifts/week
14 physicist shifts/week
7 controls eng. shifts/week
7 sys. engineer shifts/week
Average of 2-3 shifts/week for each physicist
Average of 1/2 shift/week for each controls eng.
Average of 1 shift/week for each sys. engineer
Oct. 12, 2006
LCLS FAC
11
Paul Emma
Emma@SLAC.Stanford.edu
LCLS Commissioning Parameters
Parameter
RF rate
Value
Comments
10-30 Hz
10 Hz in linac with possible 30-Hz rate - 120 Hz in
gun for short time to verify full rate
Beam rate
≤30 Hz
30 Hz e- beam as baseline – possible short term 120Hz tests in L0-BC1 for feedback tests, etc
Drive-laser rate
30 Hz
120-Hz during laser commissioning – 30 Hz during ecommissioning - shutters provide lower e- rate
200-500 pC
depends on QE and diagnostics – some short spans
at 10 pC – later in ’07 explore 1-nC
Bunch charge
Drive-laser pulse length 10 ps fwhm
10-ps fwhm startup with possibility of 6-ps at 0.2 nC
Gun gradient
Set as goal, although 110 MV/m is adequate in ‘07
Oct. 12, 2006
LCLS FAC
120 MV/m
12
Paul Emma
Emma@SLAC.Stanford.edu
LCLS FAC
http://wwwssrl.slac.stanford.edu/lcls/internals/commissioning/documents/l
clsinjector-commissioninggoals.doc
2007 Injector Commissioning Goals
Oct. 12, 2006
13
Paul Emma
Emma@SLAC.Stanford.edu
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
Oct. 12, 2006
LCLS FAC
14
Paul Emma
Emma@SLAC.Stanford.edu
Q  1 nC RF
f  120 Hz
G  120 MV/m
gex,y  1 mm
Dt  10 ps
I  100 A
E  6 MeV
Photo-Cathode Gun
spec. dipole
e-
e-
UV laser
solenoid
YAG screens
RF gun
cathode
Oct. 12, 2006
LCLS FAC
15
Paul Emma
Emma@SLAC.Stanford.edu
RF Gun
EN
VA
CU
UM
TR
EA
TM
PU
TC
HAM
MPS
BER
YAG screen
YAG screen
LO
A S NG
SE B EL
M BL LO
Y WS
SP
SE O OL
AL S
FR
OM
CA
TH
ODE
UH
GA V A
TE LL
VAL M ET
VE AL
S
PO
H O RCU
LD PI
E R NE
VA
LVE
YAG screen
YAG
screen
trajectory (BPMs)
emittance (+ slice)
energy spread (+ slice)
bunch length (+ dist.)
charge (+ dark current)
YAG screen
Transverse RF deflector
OTR & wire
gun
spectrometer
Injector
Diagnostics
OTR & wire
OTR & wire
OTR & wire
main SLAC Linac
injector spectrometer
YAG
Oct. 12, 2006
LCLS FAC
16
YAG & OTR
Paul Emma
Emma@SLAC.Stanford.edu
Injector Through BC1
RF Gun & Solenoid
L0a&L0b S-Band Linacs
Transverse RF Cavity
Bunch-Compressor-1
(BPM, OTR, collimator)
OTR & Wire Scanners
Gun
Spectrometer
L1 S-Band Linac
Wire Scanners
+ OTR
135 MeV
250 MeV
X-Band RF
Straight Ahead Spectrometer
Bunch Length Diagnostics
40 m
Oct. 12, 2006
LCLS FAC
17
TD-11
stopper
Paul Emma
Emma@SLAC.Stanford.edu
Accelerator Sections Straightened
Coordinate Measurement Machine (CMM)
after
before (De/e  30%)
Four RF sections measured on CMM and straightened (L0a, L0b, L1a, L1b)
Jose Chan
Oct. 12, 2006
LCLS FAC
18
Paul Emma
Emma@SLAC.Stanford.edu
Magnet Polarities Defined and Documented
DIPOLES
QUADRUPOLES
Oct. 12, 2006
LCLS FAC
SOLENOIDS
19
Paul Emma
Emma@SLAC.Stanford.edu
BPMs, Wire-Scanners, etc. Polarities Defined
BPMs:
Wire-Scanners:
q=0
q = +45º
q = -45º
q = +45º
Oct. 12, 2006
LCLS FAC
20
Paul Emma
Emma@SLAC.Stanford.edu
All Magnets Measured (all steering coil ‘types’)
Dipole field vs. x
Current vs.
integrated field
FINT = 0.454
Solenoid eff. length
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 fringe
field vs. z
+ field harmonics
Oct. 12, 2006
LCLS FAC
21
Paul Emma
Emma@SLAC.Stanford.edu
BC1 Chicane
tweaker
quad 2
0-30 cm
translation stage
tweaker
quad 1
OTR
collimator
BPM
X-band RF
Oct. 12, 2006
LCLS FAC
22
Paul Emma
Emma@SLAC.Stanford.edu
BC1 Dipole Fields are Marginal
tracking through fields
measured with
stretched wire
De/e0  1 to 6 %
Pole nose pieces in fabrication + tweaker quadrupoles available
Oct. 12, 2006
LCLS FAC
23
Paul Emma
Emma@SLAC.Stanford.edu
Dispersion Correction in SPPS Chicane
One linear comb. of 2 tweaker quads
Oct. 12, 2006
LCLS FAC
24
Paul Emma
Emma@SLAC.Stanford.edu
Pre-Beam Tunnel Check List
etc.
Oct. 12, 2006
LCLS FAC
25
Paul Emma
Emma@SLAC.Stanford.edu
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
Information will be available at ICW site:
http://www-ssrl.slac.stanford.edu/lcls/workshops/lcls_icw_oct06/index.html
...under the link: “LCLS Commissioning”.
Oct. 12, 2006
LCLS FAC
26
Paul Emma
Emma@SLAC.Stanford.edu