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HOM-couplers (pick-ups). Task 10.7 HOM based Monitors. HOM based monitors for beam diagnostics cavity/cryo-module diagnostics DESY, Manchester Univ. / Cockcroft Inst., Rostock Univ. experimental studies at FLASH, ERLP, the wire test facility at CI Sub-task 1: HOM-BPMs

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task 10 7 hom based monitors

HOM-couplers (pick-ups)

Task 10.7 HOM based Monitors
  • HOM based monitors for
    • beam diagnostics
    • cavity/cryo-module diagnostics
    • DESY, Manchester Univ. / Cockcroft Inst., Rostock Univ.
    • experimental studies at FLASH, ERLP, the wire test facility at CI
  • Sub-task 1: HOM-BPMs
    • monitor 1 dipole mode and calculate beam position
    • proof of principle already made
    • resolution expected ~ 1 mm
    • advantages:
      • center beam  minimize wakes  critical for 3.9 GHz cav. and at low energies for the 1.3 GHz
      • no new vacuum component
task 10 7 hom based monitors 2

Cavity alignment in ACC4

x [mm]

~100 mm rms

y [mm]

~300 mm rms

Task 10.7 HOM based Monitors (2)
  • Sub-task 2: Cavity diagnostics
    • study the HOM spectrum in each cavity to determine:
    • cavity alignment
    • cell geometry
  • Sub-task 3: Geometrical dependencies of HOM distributions
    • simulations combining finite element and S-matrix cascading techniques
    • multi-cavities, cell deformation, influence of couplers on spectrum etc.
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