Injector System Description

1
Injector System Description
David Schultz LCLS e--beams Systems
Manager Injector Accelerator Readiness
Review 10/31/06

• The Injector Beamline
• The Installation Schedule
• Commissioning Beam Parameters
• The Commissioning Schedule

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LCLS Project Overview
Linac Coherent Light Source
Injector
Linac
e-Beam Transport
Undulator
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LCLS Installation Schedule
6 MeV
250 MeV
4.30 GeV
13.6 GeV
135 MeV
Linac-X L 0.6 m
Linac-0 L 6 m
rf gun
L0-a,b
Linac-1 L ?9 m
Linac-2 L ?330 m
Linac-3 L ?550 m
25-1a 30-8c
21-3b 24-6d
...existing linac
21-1 b,c,d
undulator L 130 m
X
BC2 L ?22 m
BC1 L ?6 m
Wall region
DL2 L 275 m
Now through Dec.
2007 down
SLAC linac tunnel
research yard
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LCLS Installation and Commissioning Time-Line
Drive-Laser Commissioning
LTU/und. Install
Drive-Laser Installed
LTU/und. hall ready
Controls Checkout
First Spont. Light
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
No Ops
Gun/Inj./BC1 Commissioning
Gun/Inj./BC1 Install (8/21 2/20)
Inj./Linac/BC2 Commissioning
linac/BC2 Install
LTU/und. Commissioning
Oct. 19, 2006
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2007 Commissioning
Sector 21
LinacSector 20
Laser
stopper
BLM
BC1
LX
L1
Ins/SAB
Wall
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Injector through BC1
RF Gun Solenoid
L0aL0b 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
TD-11 stopper
X-Band RF
Straight Ahead Spectrometer
Bunch Length Diagnostics
40 m
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LCLS Injector/Linac Installation Schedule

• Linac component installation complete by
• Wall 11/14
• Ins/SAB 12/13
• L1 11/8
• LX 11/9
• BC1 11/30
• BLM 12/13
• Cable plant 12/4
• PPS cert. 11/3

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LCLS Injector/Linac Installation Schedule

• Injector components installation complete by
• Wall/Heater 11/6
• L0a,L0b 12/13
• Gun Area 3/16/07 pacing item
• PPS Cert 12/18

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LCLS Injector Commissioning Parameters
Tables from the SAD, assumes 120 pulses/sec
Nominal operating conditions
At TD11 120 nA at 250 MeV 30 W
At the end of SLAC Linac 120 nA at 14.1 GeV 1692 W
Maximum beam power for operations 5 kW
Maximum credible LCLS beam power
At TD11 6 µA at 250 MeV (max) 1.5 kW
At the end of SLAC Linac 6 µA at 16 GeV (average) 100 kW
Envelope Beam Power
LCLS Safety Envelope 100 kW
LCLS Operation Envelope 5 kW
LCLS Nominal Operating Power 1.7 kW
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LCLS Injector Commissioning Parameters
Operation plan, rep. rate and charge reduced.
Parameter Value Comments
RF rate 30 Hz 30 Hz in linac - 120 Hz in gun hot test gun
Beam rate 30 Hz 10 Hz e- beam as baseline possible short term 30-Hz tests (difficult beyond 30 Hz due to laser rate)
Drive-laser rate 30 Hz 120-Hz during laser commissioning 30 Hz during e- commissioning - shutters provide lower e- rate
Bunch charge 200-500 pC depends on QE and diagnostics some short spans at 10 pC later in 07 explore 1-nC
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LCLS Injector Commissioning Dates
Dec 22 PPS Certified Dec 20-Jan 1 Holidays Jan
2 VVSs switched on for PEP-II (RF power
available) Jan 15 L0a, L0b, L1 RF processing
begins Feb. 1 X-band RF processing begins Feb
20 GTL beamline installation complete Mar
6 Virtual cathode fully characterized (ready to
install gun) Mar 7 RG gun installation begins
laser rate to 30 Hz Mar 16 First laser UV-light
on cathode! Mar 17 Electrons in GTL and
gun-spectrometer Apr 9 Beam through L0a, L0b
and down to 135-MeV spectrometer Apr 24 Beam
into main linac (to TD11 dump) July Take beam
down full linac (to BSY SL2 stopper)
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End