HOM issues in the ESS SC linac

Name: HOM issues in the ESS SC linac
Start: 2011-09-22T08:45:00+02:00
End: 2011-09-23T13:00:00+02:00
Location: European Spallation Source

22 Sept 2011, 08:45 → 23 Sept 2011, 13:00 Europe/Stockholm

Auditorium, 1st floor (European Spallation Source)

Auditorium, 1st floor

European Spallation Source

Stora Algatan 4, Lund

Stephen Molloy (ESS)

Description

HOM issues in the ESS SC linac, including discussions on the likely HOM spectrum for each cavity family, beam dynamics issues, coupler design, and the risks/benefits of installing couplers. The output of this meeting will include plans for a program of simulation studies, a program of hardware measurements, possible impacts on the planning of test stands, and input to the CDR.

Participants

13 View full list

Thursday 22 September
- Thu 22 Sept
- Fri 23 Sept
- Coffee and registration
- Welcome
  
  Introduction to the meeting, and definition of the goals
  
  Convener: Stephen Molloy (ESS)
  - 1
    
    Introduction and Welcome
    
    Speaker: David McGinnis (ESS)
  - 2
    
    Meeting goals
    
    Speaker: Stephen Molloy (ESS)
    
    Slides
- Beam parameters & cavity design
  
  The design of the ESS SC cavities, their RF properties, and a discussion of HOM impact on beam quality
  
  Convener: David McGinnis
  - 3
    
    ESS time structure & bunch length
    
    Speaker: Håkan Danared (ESS)
    
    Slides
  - 4
    
    Considerations of cavity design
    
    Speaker: Rama Calaga (Brookhaven National Laboratory (BNL))
    
    Slides
  - 5
    
    Elliptical cavity design
    
    Speaker: guillaume devanz
    
    Slides
- 10:40
  
  Coffee
- Beam parameters & cavity design
  
  The design of the ESS SC cavities, their RF properties, and a discussion of HOM impact on beam quality
  
  Convener: David McGinnis (ESS)
  - 6
    
    Spoke cavity design
  - 7
    
    Beam dynamics due to HOMs
    
    Speaker: Marcel Schuh (CERN)
    
    Slides
- Lunch
- HOM couplers
  
  Convener: Stephen Molloy (ESS)
  - 8
    
    Studies of HOMs in Elliptical and Spoke Cavities for ESS
    
    Speaker: Roger Jones (University of Manchester, Cockcroft Institute)
    
    Slides
  - 9
    
    HOM coupler design
    
    Speaker: Hans-Walter Glock (Rostock)
    
    Slides
  - 10
    
    Discussion
- 15:00
  
  Coffee
- HOM coupler risks
  
  A discussion of the risks presented by the installation at other machines, including experiences from SNS
  
  Convener: Deepak Raparia
  - 11
    
    Coupler multipactor
    
    Speakers: Robert Ainsworth (RHUL), Stephen Molloy (ESS)
    
    Slides
  - 12
    
    Discussion
Friday 23 September
- Thu 22 Sept
- Fri 23 Sept
- Coffee
- 13
  
  Summary of day 1
  
  Speaker: Stephen Molloy (ESS)
- Discussion - Simulation studies
  
  Build a prioritised list of required simulations (small & large-scale)
  
  Convener: Stephen Molloy (ESS)
  - 14
    
    MP & FE in Vorpal
    
    Speaker: Jonathan Smith (Tech-X)
  - 15
    
    Multi-cavity effects
    
    Speaker: Stephen Molloy (ESS)
    
    Slides
- 10:45
  
  Coffee
- Discussion - Studies at test stands
  
  Build a prioritised list of tests to be performed at future ESS test stands.
  - 16
    
    HOMs as beam diagnostics
    
    Speaker: Nicoleta Baboi (DESY)
    
    Slides
- Discussion - Drawing conclusions
  
  Respond to the questions raised at the start of the meeting, and any other questions raised along the way (listed in today's summary talk).
  
  Convener: David McGinnis (ESS)