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LCLS Gun Fabrication and Testing Update

Detailed overview of the fabrication process, testing results, and magnetic component characterization for the LCLS RF gun. Includes specifications, qualification chamber details, and preparation for high-power testing.

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LCLS Gun Fabrication and Testing Update

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  1. LCLS Gun Fabrication and Testing StatusDavid H. DowellDOE Lehman Review October 25, 2006 • Status of gun fabrication and testing • Gun test results • Characterization of magnetic components • Cathode qualification chamber operational • Gun high power testing in Klystron Lab • Summary

  2. Gun Fabrication and Testing Process • Fabricate parts • Cold test sub assemblies and clamped parts • Machine and measure for resonance and field balance • Braze and weld final assembly • Low power RF and cathode tests • Furnace bake at 500deg C • Assemble and configure for high power RF test (hot test) • Vacuum bake of assembly in Klystron test vault • Perform hot test • Vacuum qualification of gun • Alignment of assembly with CMM • Install at S20

  3. RF Gun Fabrication and Cold RF Testing Finished & Preparing for High-Power Tests Gun only pictures CAD cut away view of gun interior

  4. RF Field Balance Measured Using Bead Drop Technique Data compliments J. Wang, ATR Dept., SLAC

  5. Gun Design and Measured Specifications

  6. focusing solenoid dual rf power feed cathode flange LCLS RF Gun: Cathode Side

  7. LCLS RF Gun: Beam Side dual rf power feeds focusing solenoid beam port: Attach 2-km linac here

  8. Description of gun magnet system • Gun solenoid: SOL1 • Bucking coil: SOL1BK • X,Y dipole correctors: XC00&YC00 (inside SOL1) • Normal & skewed quad correctors: CQ01&SQ01 (inside SOL1) • Field maps and calibrations measured

  9. Gun Solenoid and Dipole Corrector Magnetic Measurements

  10. Bucking Coil Magnetic Measurements

  11. (1) Vacuum chamber (2) Cathode load port (3) Viewport (4) Cathode on rotation stage (5) To RGA and gauge (6) To vacuum pump (7) XPS x-ray source (8) AES/SEM electron gun (9) XPS/AES energy analyzer (10) Cold cathode H+ gun (11) UV light and monochromator Cathode Qualification System (CQS)

  12. Cathode Qualification System • Measures either GTF- or LCLS-style cathodes • Ion-cleaning, XPS/AES, QE • Cathode carrier/storage containers are being fabricated

  13. LCLS Cathode#1 Qualification (in CQS) LCLS Min QE H2-brazed, diamond fly cut, vacuum fired at 650C for 24 hours, H-ion cleaned

  14. RF Gun/Solenoid Assembly in Klystron Test Vault

  15. Summary of Gun Fabrication and Testing • Gun fabrication and cold testing completed • Gun meets all design goals • All magnetic components calibrated and characterized • Gun integrated with solenoid and waveguide assembly • Installed in test vault at Klystron • First bake of assembly (gun vacuum in high 10-10 Torr) • High-power RF (hot) testing has begun • Final vacuum qualification & alignment performed after Hot-Testing • Cathode processing chamber operational and producing cathodes for the gun • Gun on schedule for March 7, 2006 installation

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