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LCLS Injector Update D. H. Dowell, SLAC FAC Review, October 12-13, 2004. Injector Performance Requirements Conventional Facilities Update Shield Wall Installed Sector 20 Alcove Title I complete Title II begun RF Design Update Drive Laser Update Injector Physics Update Summary. - PowerPoint PPT Presentation
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David H. Dowell
Injector Update [email protected]
October 12-13, 2004
LCLS Injector UpdateD. H. Dowell, SLAC
FAC Review, October 12-13, 2004
•Injector Performance Requirements•Conventional Facilities Update
–Shield Wall Installed–Sector 20 Alcove
•Title I complete•Title II begun
•RF Design Update •Drive Laser Update•Injector Physics Update•Summary
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Parameter Value Peak current 100 A Charge 0.1 – 1 nC Normalized transverse emittance projected/slice
1.2 / 1.0 m rms
Rate 120 Hz Energy 135 MeV Energy spread @ 135 MeV projected/slice
0.1 / 0.01 % rms
Gun laser timing stability 0.50 ps rms Booster mean rf phase stability 0.1 rms Charge stability 2.0 % rms Bunch length stability 5 % rms
LCLS Injector Performance Requirements:
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
LCLS Injector Configuration
PORCU
PINE CATHODE
HOLDE
R
UHV A
LL METAL
GATE VALVES
SPOOLS FRO
M VALVE
SEAL
LONG B
ELLOWS
ASSEM
BLY
TREATMEN
T CHAM
BER
VACUU
M PUMPS
SLAC Main Linac Beamline
Transverse RF Cavity
Laser Heater & Chicane
35o Bend
Straight Ahead Spectrometer
L0-1 & L0-23-m SLAC Sections
Electro-Optic Diagnostic
OTR Emittance DiagnosticsRadiation Shield Walls
RF Gun & Solenoid
Load Lock
Gun Diagnostics
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
S20 Floor Plan
23 24 25 26 27 28 29 323130
4 'x 6 '
6 'x 1 5 '6 'x 1 5 '
3210M e t e rs
I N C H E S1 0 08 06 04 02 00 P20-17P20-16
FRONT
3'-6"
FRONT
P20-15P20-14
MODULATORSTA 20-8(EXISTING)
KLYSTRON
CONTROLS RACK (EXISTING)
RF CONTROL RACKS (NEW)
LKG-01LKG-02
LKG-03LKG-04
LKG-05LKG-06
FRONT
I&C CONTROL RACKS (NEW)
LKG-07LKG-08
LKG-09LKG-10
LKG-11LKG-12
LKG-13LKG-14
LKG-15LKG-16
LKG-17LKG-18
LKG-19LKG=20
LKG-21LKG-22
LKG-23LKG-24
6' 8"
5'-1
1"
2'-4
"
20'-0"
14
'-0"
20'-0"
12'-8"
10'-0"
19'-10"60'-1"
11'-2"
22'-11"
36'-9"
19'-10"
11'-6"
10'-0"typ.
Roll Up Equipment Door
OverheadCrane
8'-0"
Large Equipment Access,Removable Panel, 8 ft wide,floor to ceiling
Injector Vault ControlledEntry Area
Power Supply andControl Racks
Laser BayControlled EntryArea
Load LockRoom
Storage & LocalControl Area
Loading &Work Area
Laser Bay
RF Hut
60.000
1'-0"
1'-0"
120.000
See PRD: Conventional Facilities Specifications For the Sector 20 Alcove
•Cable Plant Specs Defined•Title II Design Started
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
RF Design ProgressL0-1 Accelerator section
Dual feed RF design completeL0-1 engineering design nearly complete
120 Hz GunSolenoid design completeRF design nearly completeRedesigned coupler holes solved pulsed heating problemAdopted racetrack geometry for full cellHeld technical meetings with prospective vendorsUnresolved issues:
Final design for bulk cooling systemLoad lock deferredDecide how much SLAC vs. vendor engineering and fabrication
Technical review first week of November
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Dual Feed RF Gun and Solenoid•Dual Feed/Racetrack Design Corrects RF Fields to Second Order•Solenoid Design Includes Both Dipole and Quadrupole Field Correctors
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Gun body stress in Pa
•Localized heating of the RF coupling port. •The heat flux (watts/m2) is shown for the gun operating at 140 MV/m and 120 Hz. •Total dissipated power is 3676 watts.
ANSYS Analysis: John Hodgson and Nancy Yu
Localized Pulsed Heating of RF Coupling Port
•The BNL/SLAC/UCLA gun design has a T of 137oC/pulse at the port.•The redesigned port gives a T of 41oC/pulse.•NLC designs limit T to 50oC/pulse
Pulse Heating Analysis: Zenghai Li and Liling Xiao
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
L0-1 Structure RF Design
0.0200.20Cross Dual
0.0040.04Race-track dual
0.0630.63Symmetric dual
0.0780.78SLAC Single feed
Head-tail angle (rad/m)
()/m
0.0200.20Cross Dual
0.0040.04Race-track dual
0.0630.63Symmetric dual
0.0780.78SLAC Single feed
Head-tail angle (rad/m)
()/m
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Drive Laser Update (Details in “Drive Laser Update” Presentation)
Technical Review Committee AssembledC. Barty (LLNL) chairman, M. Babzien (BNL), R. Falcone (Berkeley), Y. Li (ANL)
Review Held July 21, 2004 at SLAC
Committee involved in procurement process
Laser baseline design is diode-pumped Ti:Sapphire based upon extensive discussions with vendors
Request for Proposal ready to submit to vendors
Laser pulse shaping studies underway at BNL/DUVFEL
Developing collaboration with LLNL on both near term and long term laser needs
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Injector Physics, see breakoutInjector Physics, see breakout
• Diagnostics and Commissioning– Gun measurements
• Accurate thermal evaluation• Gun spectrometer
– 6D beam characterization at 135 MeV • Simulations
– Low Charge tunings
• RF studies– L01 dual feed, racetrack shape necessary – RF gun dual feed, racetrack shape in full cell– mode 0 studies
• 8MHz mode separation better• klystron pulse shaped
8% modulation
Name r 80 (80 5%)
Nom.,1nC,10ps 1.2 mm 0.9 rad 2.5
1 nC, 17.5 ps 0.85 0.75 1.5
0.2nC,10ps 0.39 0.38 2.5
0.2nC,5ps 0.42 0.37 5
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Injector Schedule
•Schedule Coordinated with Shutdowns•Over a Year for Injector Commissioning•Injector Not on Project Critical Path
David H. Dowell
Injector Update [email protected]
October 12-13, 2004
Summary and Conclusions
Conventional facilities at S20 defined to support Title IIFacilities for two drive lasers
RF design of 120 Hz gun nearly completeSolenoid design with dipole and quadrupole correctors finishedPulsed heating solvedDual RF feed + racetrack full cell
L0-1 accelerator sectionRF design finishedEngineering design in progress
RF design review first week of NovemberBeamline components (magnets) being designedDrive laser specifications defined in Request for Proposal
