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ICFA Mini Workshop on High Order Modes in Superconducting Cavities

US/Central
Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
Alexander Sukhanov (Mr), Vyacheslav Yakovlev (FNAL)
Description
The objective of this workshop is to bring together researchers studying high order mode (HOM) suppression in superconducting cavities in the fields ranging from energy recovery linacs, light sources and linear collider applications. HOMs excited by beam in superconducting cavities can create excessive heat load on the cryogenic system and dilute beam quality, giving rise to a beam break up instability in the worst case. The workshop will discuss the current status of both experimental and theoretical work in this area. Issues in electron and proton linacs, Tesla style cavities, 3d harmonic cavities, TEM crabbing and other cavity designs will be considered. Current experiments at Fermilab, JLab, ORNL, Cornell University, and FLASH will be reviewed.
Workshop Working groups (conveners):
- HOM damping requirement (J. Sekutowicz, N. Solyak)
- HOM-based diagnostics (N. Baboi, R. Jones)
- RF simulation and beam dynamics (M. Liepe, O. Napoly)
- HOM damping couplers and loads (J. Delayen, T. Khabiboulline)
- Low level RF, controls and system integration (B. Chase, L. Doolittle)
Contact:<BR>Cynthia M. Sazama
    • 7:30 AM 8:00 AM
      Transportation from hotels (Hyatt Place & Hotel Arista) to Fermilab 30m
    • 8:00 AM 8:30 AM
      Registration 30m
    • 8:30 AM 8:45 AM
      Welcome to Fermilab 15m One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      Speaker: Nigel Lockyer (FNAL)
    • 8:45 AM 9:00 AM
      Introduction and logistics 15m One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      Speaker: Vyacheslav Yakovlev (FNAL)
      Slides
    • 9:00 AM 10:20 AM
      Plenary session 1 (V. Yakovlev, R. Jones) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 9:00 AM
        HOMs for the Future High Intensity and CW Superconducting Accelerators 25m
        Speaker: Hasan Padamsee (FNAL)
        Slides
      • 9:25 AM
        Overview of HOMs and Wakefield Issues in SC Cavities and Systems 25m
        Speaker: Roger Jones (University of Manchester)
        Slides
      • 9:50 AM
        HOM damping requirements and HOM beamline load for the Cornell ERL 25m
        Speaker: Matthias Liepe (Cornell University)
        Slides
    • 10:20 AM 10:40 AM
      Coffee Break - Wilson Hall Atrium 20m
    • 10:40 AM 12:00 PM
      WG1 - HOM Damping Requirements (J. Sekutowicz, N. Solyak) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 10:40 AM
        XFEL HOM Specifications 25m
        Speaker: Alexey Sulimov (DESY)
        Slides
      • 11:05 AM
        HOMs and wakes in LCLS-II Superconducting linac 25m
        Speaker: Karl Bane (SLAC)
        Slides
      • 11:30 AM
        Overview of HOM damping in deflecting cavity 30m
        Speaker: Dr Binping Xiao (Brookhaven National Lab)
        Slides
    • 12:00 PM 12:10 PM
      Workshop Group Photo
    • 12:10 PM 1:30 PM
      Lunch Break - Wilson Hall Café 1h 20m
    • 1:30 PM 3:00 PM
      WG1 - HOM Damping Requirements (J. Sekutowicz, N. Solyak) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 1:30 PM
        Physics of wake potentials of very short bunches 25m
        Speaker: Gennady Stupakov (SLAC)
        Slides
      • 1:55 PM
        Resonance HOM excitation in LCLS-II 20m
        Speaker: Alexander Sukhanov (FNAL)
        Slides
      • 2:15 PM
        HOM-free deflecting cavity 25m
        Speaker: Timergali Khabiboulline (FNAL)
        Slides
      • 2:40 PM
        Discussion - WG1 (J. Sekutowicz, N. Solyak) 20m
    • 3:00 PM 3:20 PM
      Coffee Break - Wilson Hall Atrium 20m
    • 3:20 PM 5:15 PM
      WG2 - HOM-based diagnostics (N. Baboi, R. Jones) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 3:30 PM
        Introduction to WG2 5m
        Speaker: Roger Jones (University of Manchester)
        Slides
      • 3:35 PM
        Overview of HOM-based diagnostics at FLASH and the European XFEL 25m
        Speaker: Nicoleta Baboi (DESY)
        Slides
      • 4:00 PM
        HOM-based diagnostics for 3.9 GHz cavities" 15m
        Speaker: Nathan Eddy (FNAL)
        Slides
      • 4:15 PM
        Plans at FNAL (for HOM-based diagnostics) 15m
        Speaker: Nathan Eddy (FNAL)
        Slides
      • 4:30 PM
        HOM studies on cavity alignment at KEK and DESY 25m
        Speaker: Ayaka Kuramoto (KEK)
        Slides
      • 4:55 PM
        Discussion - WG2 (N. Baboi, R. Jones) 20m
    • 5:30 PM 7:30 PM
      Student Poster Session/Reception
    • 7:30 PM 8:00 PM
      Transportation to hotels (Hotel Arista & Hyatt Place) 30m
    • 8:00 AM 8:30 AM
      Transportation from hotels (Hyatt Place & Hotel Arista) to Fermilab 30m
    • 8:30 AM 10:05 AM
      WG2 - HOM-based diagnostics (N. Baboi, R. Jones) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 8:30 AM
        Stability of HOM BPMs in FLASH 25m
        Speaker: Liangliang Shi (DESY)
        Slides
      • 8:55 AM
        Simulation results for diagnostics in 3.9 GHz cavities 25m
        Speaker: Thomas Flisgen (University of Rostok)
        Slides
      • 9:20 AM
        Measuring HOM parameters with beam for Cornell's ERL cavities 25m
        Speaker: Daniel Hall (Cornell University)
        Slides
      • 9:45 AM
        Discussion - WG2 (N. Baboi, R. Jones) 20m
    • 10:05 AM 10:25 AM
      Coffee Break - Wilson Hall Atrium 20m
    • 10:25 AM 12:25 PM
      WG3 - RF simulation and beam dynamics (M. Liepe, O. Napoli) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 10:25 AM
        RF simulation for accurate measurements of HOM-material properties 25m
        Speaker: Valery Shemelin (Cornell University)
        Slides
      • 10:50 AM
        Beam dynamics in the ESS linac under the influence of monopole and dipole modes 25m
        Speaker: Aaron Farricker (University of Manchester)
        Slides
      • 11:15 AM
        HOMs in velocity-of-light spoke cavities 25m
        Speaker: Christopher Hopper (ODU)
        Slides
      • 11:40 AM
        HOMs and HOM damping in RF-dipole cavities 25m
        Speaker: Subashini De Silva (JLab)
        Slides
      • 12:05 PM
        Discussion - WG3 (M. Liepe, O. Napoli) 20m
    • 12:25 PM 1:30 PM
      Lunch Break - Wilson Hall Café 1h 5m
    • 1:30 PM 3:50 PM
      WG4 - HOM damping couplers and loads (J. Delayen, T. Khabiboulline) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 1:30 PM
        HOM coupler for SPL project 25m
        Speaker: Kai Papke (CERN)
        Slides
      • 1:55 PM
        HOM measurements at R&D ERL and developing new HOM couplers for eRHIC 25m
        Speaker: Wencan Xu (BNL)
        Slides
      • 2:20 PM
        HOM survey results from JLab upgrade cryomodule production run 25m
        Speaker: Jiquan Guo (JLab)
        Slides
      • 2:45 PM
        First expedience with an HOM coupler for the 56 MHz quarter wave SRF cavity 25m
        Speaker: Sergey Belomestnykh (BNL)
        Slides
      • 3:10 PM
        HOM coupler heating in CW operation 20m
        Speaker: Nikolay Solyak (FNAL)
        Slides
      • 3:30 PM
        Discussion - WG4 (J. Delayen, T. Khabiboulline) 20m
    • 3:50 PM 4:10 PM
      Coffee Break - Wilson Hall Atrium 20m
    • 4:10 PM 5:55 PM
      WG5 - LLRF, controls and system integration (B. Chase, L. Doolittle) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 4:10 PM
        LLRF theory and vector control interaction with HOM signals 20m
        Speaker: Brian Chase (FNAL)
        Slides
      • 4:30 PM
        Discussion - On phase measurements at various SC facilities 20m
      • 4:50 PM
        HOM transfer function measurements and other topics 20m
        Speaker: Larry Doolittle (LBNL)
        Slides
      • 5:10 PM
        Discussion - On HOMs and tuning 20m
      • 5:30 PM
        Discussion - Design approaches to HOM receivers (B. Chase, L. Doolittle) 20m
    • 6:00 PM 8:00 PM
      Workshop dinner 2h
    • 8:00 PM 8:30 PM
      Transportation to hotels (Hotel Arista & Hyatt Place) 30m
    • 8:30 AM 9:00 AM
      Transportation from hotels (Hyatt Place & Hotel Arista) to Fermilab 30m
    • 9:00 AM 10:20 AM
      Plenary session 2 / Closeout (V. Yakovlev, R. Jones) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 9:00 AM
        Summary of WG1 (J. Sekutowicz, N. Solyak) 20m
        Slides
      • 9:20 AM
        Summary of WG2 (N. Baboi, R. Jones) 20m
        Slides
      • 9:40 AM
        Summary of WG3 (M. Liepe, O. Napoly) 20m
        Slides
      • 10:00 AM
        Summary of WG4 (J. Delayen, T. Khabiboulline) 20m
        Slides
    • 10:20 AM 10:40 AM
      Coffee Break - Wilson Hall Atrium 20m
    • 10:40 AM 12:00 PM
      Plenary session 3 / Closeout (V. Yakovlev, R. Jones) One West

      One West

      Fermi National Accelerator Laboratory P.O. Box 500 Batavia, IL 60510-5011 United States
      • 10:40 AM
        Summary of WG5 (B. Chase, L. Doolittle) 20m
        Slides
      • 11:00 AM
        Closing remarks 15m
        Speaker: Vyacheslav Yakovlev (FNAL)
        Slides
    • 12:00 PM 1:30 PM
      Lunch Break - Wilson Hall Café 1h 30m
    • 1:30 PM 3:30 PM
      Tour of the Fermilab SRF facilities 2h
    • 3:30 PM 4:00 PM
      Transportation to hotels (Hotel Arista & Hyatt Place) 30m