LCLS Injector Introduction D H Dowell SLAC Injector

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LCLS Injector: Introduction D. H. Dowell, SLAC Injector RF Review: November 3, 2004 •

LCLS Injector: Introduction D. H. Dowell, SLAC Injector RF Review: November 3, 2004 • Injector Performance Requirements • Injector Description • The LCLS Injector Facility at Sector 20 • Detail of Gun to Linac Region • Gun and Solenoid Description • Injector RF Design Status & Schedule • Charge to this Committee November 3, 2004 Injector RF Design Review 1 David H. Dowell dowell@slac. stanford. edu

LCLS Injector Performance Requirements: November 3, 2004 Injector RF Design Review 2 David H.

LCLS Injector Performance Requirements: November 3, 2004 Injector RF Design Review 2 David H. Dowell dowell@slac. stanford. edu

LCLS Injector Configuration RF Gun & Solenoid L 0 -1 & L 0 -2

LCLS Injector Configuration RF Gun & Solenoid L 0 -1 & L 0 -2 3 -m SLAC Sections Load Lock Laser Heater & Chicane Gun Diagnostics Transverse RF Cavity Electro-Optic Diagnostic OTR Emittance Diagnostics Radiation Shield Walls 35 o Bend SLAC Main Linac Beamline Straight Ahead Spectrometer November 3, 2004 Injector RF Design Review 3 David H. Dowell dowell@slac. stanford. edu

Sector 20 Alcove Laser Bay Drive Laser System Transport Tubes Laser Heater Transport Tube

Sector 20 Alcove Laser Bay Drive Laser System Transport Tubes Laser Heater Transport Tube RF Gun Electron Diagnostic Laser Heater November 3, 2004 Injector RF Design Review UV Launch and Condition. Photocathode Gun & Launch System 4 David H. Dowell dowell@slac. stanford. edu

S 20 Alcove Floor Plan Laser Penetration • Title I Completed • Title II

S 20 Alcove Floor Plan Laser Penetration • Title I Completed • Title II Specifications Released • Room & Utilities Sized for 2 Drive Lasers November 3, 2004 Injector RF Design Review 5 David H. Dowell dowell@slac. stanford. edu

High Power RF for LCLS Injector Walls of re-built S 20 Alcove • No

High Power RF for LCLS Injector Walls of re-built S 20 Alcove • No procurement of high power RF, except waveguide • Waveguide runs established and in design • LLRF System in design November 3, 2004 Injector RF Design Review 6 David H. Dowell dowell@slac. stanford. edu

Gun to Linac Region Cathode Load Lock RF Gun Solenoid Linac Solenoid L 0

Gun to Linac Region Cathode Load Lock RF Gun Solenoid Linac Solenoid L 0 -1 Porcupine Cathode Clamp Gun Spectrometer November 3, 2004 Injector RF Design Review 7 David H. Dowell dowell@slac. stanford. edu

Dual Feed RF Gun and Solenoid • Dual Feed/Racetrack Design Corrects RF Fields to

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 November 3, 2004 Injector RF Design Review 8 David H. Dowell dowell@slac. stanford. edu

Measurements of Gun Solenoid Multipole Fields Gun Solenoid will have Dipole and Quadrupole Correction

Measurements of Gun Solenoid Multipole Fields Gun Solenoid will have Dipole and Quadrupole Correction Coils • Solenoid being designed with both dipole and quadrupole correcting coils November 3, 2004 Injector RF Design Review 9 David H. Dowell dowell@slac. stanford. edu

Injector RF Design Status L 0 -1 Accelerator section Dual feed RF design complete

Injector RF Design Status L 0 -1 Accelerator section Dual feed RF design complete Engineering design nearly complete Subject of this review 120 Hz Gun Solenoid design complete, Drawings released RF design nearly complete Redesigned coupler holes solved pulsed heating problem Adopted racetrack geometry for full cell Issued RFI and held technical meetings with prospective vendors Unresolved issues & Topics of this review: Decide on 0 -pi mode separation Final design for bulk cooling system Load lock deferred, SBIR proposal for funding November 3, 2004 Injector RF Design Review 10 David H. Dowell dowell@slac. stanford. edu

LCLS Project Schedule November 3, 2004 Injector RF Design Review 11 David H. Dowell

LCLS Project Schedule November 3, 2004 Injector RF Design Review 11 David H. Dowell dowell@slac. stanford. edu

LCLS Injector and Linac Schedule Gun and L 0 -1 needed for installation: October

LCLS Injector and Linac Schedule Gun and L 0 -1 needed for installation: October 2006 November 3, 2004 Injector RF Design Review 12 David H. Dowell dowell@slac. stanford. edu

Charge to the Committee Critically assess the RF, thermal and mechanical designs for the

Charge to the Committee Critically assess the RF, thermal and mechanical designs for the gun and first accelerator section (L 0 -1) which are proposed to meet the LCLS injector requirements The Committee is asked to provide comments and recommendations on: Beam dynamics and the dual feed and racetrack designs for the gun and L 0 -1 accelerator section. The elimination of dipole and quadrupole field distortions with dual feed couplers and racetrack shaped coupler cells. Thermal management and RF mode issues for the gun. Thermal distortion of the gun when operated at 120 Hz & 120 MV/m. Excitation of the 0 -mode and its effect in the gun during the RF transient. Whether or not the 0 -pi mode separation should be increased. Manufacturing, RF testing and tuning procedures. The Committee is requested to respond to the following general issues: 1. Identify and quantify technical issues related to the Injector RF design 2. Determine if the design will meet LCLS requirements 3. Identify any technical issues not already included in design 4. Determine if design, RF tuning and construction plans are reasonable 5. Make comments and suggestions for improving the RF design A written report of the committee’s comments and recommendations is requested. November 3, 2004 Injector RF Design Review 13 David H. Dowell dowell@slac. stanford. edu