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Status and News from the XFEL-Injector

Status and News from the XFEL-Injector. S. Lederer PITZ-Collaboration meeting 27 th – 28 th of Oct 2011. XFEL-Injector. RF-gun. AC.A1. Gun-section compatible to FLASH. XFEL-Injector. AC.AH1. AC.A1. XFEL-Injector. ~700 mm for vacuum: Transition E-8 -> E-10 mbar

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Status and News from the XFEL-Injector

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  1. Status and News from the XFEL-Injector S. Lederer PITZ-Collaboration meeting 27th – 28th of Oct 2011

  2. XFEL-Injector RF-gun AC.A1 Gun-section compatible to FLASH

  3. XFEL-Injector AC.AH1 AC.A1

  4. XFEL-Injector ~700 mm for vacuum: Transition E-8 -> E-10 mbar + gate valves and fast shutter AC.AH1 Magnets: Corrector + 2 quads Diagnostic: Toroid, BMP, BAM, DCM Laser heater

  5. XFEL-Injector OTR OTR VKIC OTR VKIC TDSA EOD BPM BPM BPM Quad Quad Quad Quad Quad Corrector Corrector Corrector

  6. XFEL-Injector Injector dump OTR OTR Dogleg

  7. XFEL-Injector XTIN, injector floor, one month ago

  8. XSE, looking into L1, one month ago

  9. RF-gun • Type will be prototype #4 type • Goal: One common design for XFEL, FLASH and PITZ – NO VACUUM WORK AFTER CONDITIONING • Solenoids and support frame from gun2 • Check for optimization of water cooling distribution / connection • Position of micro-mover to be changed

  10. RF-gun – crucial issuesRF-window design • Major challenge at the moment: RF-window design • Preferred solution is new development MHF-p and Thales • Several mounting options under discussion, only one possibility shown • Full power through 1 window • No SF6 but small overpressure of air • Requires more complicated wave-guide distribution (4 wave-guide arms, 4 circulators, combination as close as possible to the window) Bend (vacuum pump to be included) PM e-

  11. RF-gun – crucial issuesRF-window design • PITZ design • Set-up operable @ XFEL parameters • Gradient: OK • Pulse length: OK but no long term experience • Trip rate: gun4.2 to high, gun4.1 presentation during this meeting will show • Two RF-windows with at the moment no guarantee of proper functionality • Wave-guides under SF6 • Interlock sensors (esp. pick-up at wrong positions)-> redesign of T-combiner necessary • More complicated vacuum parts • UHV directional coupler • One prototype in operation • No particle free cleaning up to now, even particle count not tested • Bigger RF-gun assembly

  12. RF-gun – crucial issues • Flange connection of coaxial coupler under investigation for improvement: • Currently extremely limited space for nuts and tools -> complicated mounting

  13. RF-gun – not so crucial issuescontact spring • FLASH design • Flat open spring • Currently silver coated copper-beryllium • Particle creation during insertion / removement of cathodes From the point of view of particle creation the uncoated copper-beryllium spring is best and the currently used Ag coated worst. Next step would be test in RF-gun: PITZ??

  14. RF-gun – not so crucial issuescontact spring • FermiLab design • Round and closed (welded) spring • Copper-beryllium • Changed cathode layout • Up to now two damaged springs without extensive usage • Spring has to many degrees of freedom • Design changes necessary • Still not proven if cathode layout change reduces dark current

  15. RF-gun: schedule Schedule adapted to current injector installation schedule! • Design to be finished Dec-2011 • PRR Dec-2011, if RF-window question is solved • Gun body already in production • Coaxial coupler production started • Components ready for cleaning Apr-2012 • Gun ready for installation at PITZ Dec-2012 • Conditioning and predefined characterization program • Gun ready for installation in XTIN Jul-2013

  16. Thanks for your attention!

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