1. LCLS Injector System Overview D. H
LCLS Injector System Overview D. H. Dowell, SLAC Lehman Review August 10-12, 2004
Injector Performance Requirements
Description of the LCLS Injector Facility
Accelerator Housing
Sector 20 Alcove
New Features of the Injector
Drive Laser Plan
Laser Heater (replaces SC wiggler)
Dual RF Feed Coupler Design for Gun and L0-1
Schedule and Budget and Organization
Risks and Near Term Plans
Summary

2. LCLS Injector Performance Requirements:

3. Sector 20 Injector Facility
Laser Bay
Drive Laser
Transport Tube
10 m
Laser Heater
Accelerators
RF Gun
UV Launch and Condition.

4. The LCLS Injector Facility at Sector 20
Local Control Room
Storage
Personnel and Equipment Access to Injector
Laser Room
Top View of S20 Alcove
Laser
Penetration
Cathode Lab
Side View of S20 Alcove, stairwell and injector off-axis vault
Injector

5. LCLS Injector Configuration
Progress Since CD2a:
L0-1 Dual Feed RF Design Completed
120 Hz Gun RF Design Nearly Complete
Laser Heater Added to Injector
=>Replacing SC Wiggler
RF Gun
Load Lock
Transverse RF Cavity
Laser Heater
DL1 Bend
Straight Ahead Spectrometer
L0-1 & L0-2
3-m SLAC Sections
Gun Diagnostics

6. S20 Alcove Floor Plan Title I Completed
Title II Specifications Released
Room & Utilities Sized for 2 Drive Lasers

7. Drive Laser Architecture and Procurement
Laser Design & Acquisition Plan Reviewed
Budgetary Quotes Received from 5 vendors
Procurement Plan Ready for FY05

8. LCLS Will Use Part of the Existing High Power RF
No procurement of high power RF equipment
Waveguide runs established and in design
LLRF System in design

9. Dual Feed RF Gun and Solenoid
Request for Information Response from 2 Vendors
Dual Feed Design Corrects RF Fields to Second Order
Solenoid Design Includes Both Dipole and Quadrupole Field Correctors

10. Laser Heater System 50 cm 10 cm q  5.7º 10 cm ~120 cm 2 cm
Laser heater replaces SC wiggler to suppress beam instabilities
Uses a small portion of the drive laser IR beam
Cost and Schedule in Baseline
Slide compliments
of P. Emma

11. Laser Heater Effect on Beam
Laser Heater increases the uncorrelated energy spread from ~5keV
to more than 50keV to suppress beam instabilities.
Studies show Laser Heater is more effective than SC Wiggler
in controlling instabilities.
P0 = 2 MW
w0 = 400 mm
sx  200 mm
sy  200 mm
Slide complements of P. Emma

12. Laser-Heater Parameters

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

14. Budgeted Cost of Work Scheduled (BCWS)
Procurements Mostly in FY05
OPC Shows Commissioning Ramp Up in FY06 & FY07

15. Injector Organization

16. Injector Risks Difficulty of achieving 1 micron @ 100 amps
Drive Laser spatial and temporal shaping combined with UV conversion
Shaping with complete laser system has not been demonstrated
Shaper (Dazzler) Experiments at BNL will begin September 1
Spatial shaping + UV conversion planned at ANL
Reliable drive laser operation
Specify a diode-pumped laser system
Reliable gun operation at 120 MV/m
Plan for future guns

17. Plans for next six months
Award contract for drive laser
Award contract for RF gun system
Demonstrate laser shaping with Dazzler and aspheric optics
Continue reviewing and engineering designs
Begin procuring and fabricating parts

18. Summary and Conclusions
Injector Configuration Finalized
Sector 20 Alcove Will be New Construction
~850 sq. ft. for Drive Laser Bay
More Space for Cathode Lab
Injector Schedule:
Installation Plan Tied to Linac Downtimes
~400 days for injector commissioning
Design and Procurement Approach:
Improve and Re-Use Existing SLAC Designs
Utilize Competent Vendors
Drive Laser Procurement Plan Established (5 vendors identified)
RF Designs Nearly Complete (2 vendors identified)
In Process of Building Injector Organization
Ready to Begin Long Lead Acquisitions in FY05