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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

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Task 10.7 HOM based Monitors

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  1. 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

  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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