1. Injector Performance Requirements Conventional Facilities Update
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

2. LCLS Injector Performance Requirements:

3. LCLS Injector Configuration
SLAC Main Linac Beamline
Transverse RF Cavity
Laser Heater & Chicane
35o Bend
Straight Ahead Spectrometer
L0-1 & L0-2
3-m SLAC Sections
Electro-Optic Diagnostic
OTR Emittance Diagnostics
Radiation Shield Walls
RF Gun & Solenoid
Load Lock
Gun Diagnostics

4. S20 Floor Plan Cable Plant Specs Defined Title II Design Started
See PRD: Conventional Facilities Specifications For the Sector 20 Alcove

5. RF Design Progress L0-1 Accelerator section 120 Hz Gun
Dual feed RF design complete
L0-1 engineering design nearly complete
120 Hz Gun
Solenoid design complete
RF design nearly complete
Redesigned coupler holes solved pulsed heating problem
Adopted racetrack geometry for full cell
Held technical meetings with prospective vendors
Unresolved issues:
Final design for bulk cooling system
Load lock deferred
Decide how much SLAC vs. vendor engineering and fabrication
Technical review first week of November

6. 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

7. Localized Pulsed Heating of RF Coupling Port
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.
The BNL/SLAC/UCLA gun design
has a DT of 137oC/pulse at the port.
The redesigned port gives a DT of
41oC/pulse.
NLC designs limit DT to 50oC/pulse
Pulse Heating Analysis:
Zenghai Li and Liling Xiao
ANSYS Analysis:
John Hodgson and Nancy Yu

8. L0-1 Structure RF Design

9. L0-1 Structure RF Dual Feed

10. Drive Laser Update (Details in “Drive Laser Update” Presentation)
Technical Review Committee Assembled
C. 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

11. Injector 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 mrad
2.5
1 nC, 17.5 ps
0.85
0.75
1.5
0.2nC,10ps
0.39
0.38
0.2nC,5ps
0.42
0.37 5

12. Injector Schedule Schedule Coordinated with Shutdowns
Over a Year for Injector Commissioning
Injector Not on Project Critical Path

13. Summary and Conclusions
Conventional facilities at S20 defined to support Title II
Facilities for two drive lasers
RF design of 120 Hz gun nearly complete
Solenoid design with dipole and quadrupole correctors finished
Pulsed heating solved
Dual RF feed + racetrack full cell
L0-1 accelerator section
RF design finished
Engineering design in progress
RF design review first week of November
Beamline components (magnets) being designed
Drive laser specifications defined in Request for Proposal