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

LCLS Injector Performance Requirements:

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

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

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

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

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

L0-1 Structure RF Design

L0-1 Structure RF Dual Feed

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

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

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

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