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Workshop on Linac Operation with Long Bunch Trains

→ Europe/Berlin
Sem. R. 2, Bldg. 3 (DESY)

Sem. R. 2, Bldg. 3

DESY

Notkestr. 85 22607 Hamburg
John Carwardine (Argonne), Nicholas Walker (DESY), Siegfried Schreiber (DESY)
Description

The corner stone of the TESLA superconducting linear accelerator technology is the ability to accelerate long bunch-trains at relatively high currents in pulsed operation. This workshop follows on from the first one held in February 2010. The ILC 9mA programme remains a central theme of the workshop, but in keeping with the broader issues of the challenges of operations with long bunch-trains and the spirit of the first meeting, this workshop will also focus on specific issues relevant to FLASH VUV-FEL and future European XFEL operations.

Unlike the first workshop, this meeting will be entirely plenary with no parallel working groups. The time will be divided into six thematic sessions:

  1. Results and analysis from the 9mA studies
  2. Toward future 9mA studies
  3. Operations modes for FLASH2
  4. Feedback and control of longitudinal phase space
  5. Machine protection for long bunch-train operation
  6. Beam-based feedback systems

Description of the scope of these themes can be found under Scientific Programme.

Group Photo #1
Group Photo #2
Workshop Report
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Participants
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  • Monday 6 June
    • Opening Session Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 1
        Welcome address
        Speaker: Dr Nicholas Walker (DESY)
      • 2
        Scope and goals for the workshop
        Speaker: John Carwardine (Argonne)
        Slides
      • 3
        Long bunch train operations at FLASH
        Speaker: Dr Holger Schlarb (DESY)
        Slides
      • 4
        The February 2011 9mA studies in an nutshell
        Speaker: Dr Nicholas Walker (DESY)
        Slides
    • 15:30
      coffee Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • 9mA studies analysis and results Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 5
        Detuning compensation studies, detuning calculations
        Speaker: Dr Mariusz Grecki (DESY)
        Slides
      • 6
        Results from the 'S1-Global' cryomodule tests at KEK
        Speaker: Dr Shinichiro Michizono (KEK)
        Slides
      • 7
        Vector Sum calibration in closed loop
        Speaker: Mr Sven Pfeiffer (DESY)
        Slides
      • 8
        Photon science with long bunch-trains
        Speaker: Dr Rolf Treusch (HASYLAB at DESY)
        Slides
      • 9
        Discussion
  • Tuesday 7 June
    • Feedback control of longitudinal phase space Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 10
        BAM electronics & software developments
        Speaker: Mr Patrick Gessler (DESY)
        Slides
      • 11
        Beam based FB implementation with SimconDSP and uTCA LLRF controllers
        Speaker: Mr Wojciech Jalmuzna (DESY)
        Slides
      • 12
        Results on BAM studies
        Speaker: Marie Bock (DESY)
        Slides
        vid1
        vid2
      • 13
        Beam stabilization with MIMO controller and BBF
        Speaker: Christian Schmidt (DESY)
        Slides
      • 14
        Discussion
    • 10:30
      coffee Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • Feedback control of longitudinal phase space Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 15
        LLRF Front-end server implementation of BBF
        Speaker: Olaf Hensler (DESY)
        Slides
      • 16
        Slow DAQ based long. feedback architecture
        Speaker: Mr Raimund Kammering (Deutsches Elektronen-Synchrotron Hamburg)
        Slides
      • 17
        Stability of photoinjector and impact of BBO crystal
        Speaker: Sebastian Schulz (DESY)
        Slides
      • 18
        Discussion
    • 12:30
      lunch Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • 9mA studies analysis and results Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 19
        Energy regulation performance with beam loading
        Speaker: Mr Christian Schmidt (DESY)
        Slides
      • 20
        Investigation of individual cavity field stability and slopes on vector sum regulation
        Speaker: Wojciech Cichalewski (TUL-DMCS)
        Slides
      • 21
        Gradient flatness studies results and analysis
        Speaker: Dr Gustavo Cancelo (Fermilab)
        Slides
      • 22
        Analysis of piezo sensor signals and their correlation to detuning
        Speaker: John Carwardine (Argonne)
        Slides
      • 23
        Discussion
    • 15:30
      coffee Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • 9mA future studies Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 24
        Priorities and desired results from the next 9mA studies
        Speaker: John Carwardine (Argonne)
        Slides
      • 25
        Planned LLRF upgrades
        Speaker: Frank Ludwig (DESY)
        Slides
      • 26
        Parameter space for Pk/Ql studies at 6mA and high gradients
        Speaker: Dr Gustavo Cancelo (Fermilab)
        Slides
      • 27
        Proposed RTML studies at FLASH
        Speaker: Nikolay Solyak (Fermilab)
        Slides
      • 28
        Discussion
    • 18:30
      Workshop Dinner DESY Bistro

      DESY Bistro
  • Wednesday 8 June
    • Machine Protection Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 29
        XFEL (FLASH2) MPS system
        Speaker: Dirk Noelle (DESY)
        Slides
      • 30
        FLASH Beam Loss Monitor System
        Speaker: Dr Alexander Kaukher (DESY)
        Slides
      • 31
        FLASH MPS Philosophy
        Speaker: Dr Siegfried Schreiber (DESY)
        Slides
      • 32
        Discussion
    • 10:30
      coffee Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • Concurrent operation modes for FLASH1 and FLASH2 Beamlines Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 33
        Overview of the FLASH2 Project
        Speaker: Bart Faatz (DESY)
        Slides
      • 34
        LLRF options and tests
        Speaker: Dr Valeri Ayvazyan (DESY)
        Slides
      • 35
        Timing issues
        Speaker: Mr Patrick Gessler (DESY)
        Slides
      • 36
        Kicker stability and flatness measurements
        Speaker: Frank Obier (DESY)
        Slides
      • 37
        Discussion
    • 12:30
      lunch Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • 9mA future studies Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
      • 38
        Reaching higher average gradients for 9mA studies
        Speaker: Dr Nicholas Walker (DESY)
        Slides
      • 39
        Proposed Pk/Ql studies at NML (via webex)
        Speaker: Mr Brian Chase (FNAL)
        Slides
      • 40
        Lorentz-force detuning compensation using Least-Squares optimization (via webex)
        Speaker: Yuriy Pischalnikov (Fermilab)
        Slides
      • 41
        Discussion
    • 15:30
      coffee Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg
    • Closing session Sem. R. 2, Bldg. 3

      Sem. R. 2, Bldg. 3

      DESY

      Notkestr. 85 22607 Hamburg

      Summaries and further planning.

      • 42
        Discussion of key findings and future plans
        Mindmap
        Mindmap (Mind-Manager source file)
      • 43
        Closing remarks
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