ILC Positron TDR and R

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ILC Positron TDR and RD Collaboration Meeting
1 OxfordSummary Discussion and Meeting
Critique Discussions 9 and 10

• J. C. Sheppard
• SLAC
• September 29, 2006

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Discussion 9 Z2 Summary
ILC Positron System Design and RD Goals in
Support of the TDR
Z2 Meeting Summary Discussion Action Items Z3
Meeting Format Discussion What Works What
Does Not Work What Do We Do Differently
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Discussion 9 Z2 Summary
ILC Positron System Design and RD Goals in
Support of the TDR
Topic leaders will write a short summary for each
meeting with an emphasis on accomplishments and
action items One Page The meeting chair is
responsible for collecting the topical summaries
and writing an overall summary of progress and
expected goals by the time of the next meeting.
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Discussion 9 Z2 Summary

• Topic Action Items
• Target Systems Ian Bailey/Tom Piggott
• Looking to urgently prototype target wheel in UK.
  No one else currently requesting funding.
• Test first prototype baseline target at DL in
  Summer 2007.
• LLNL, Liverpool, DL to present ptype drawings at
  Feb 07 meeting.
• Estimate force on wheel from pulsed OMD. Jeff to
  coordinate.
• Specify how prototyping plans depend on outcome
  of OMD studies.
• RAL/DL report on impact of remote-handling
  strategies (see target hall session) on target
  design at Feb 07 meeting.
• Number of RD cycles, milestones and timeline
  will be agreed by main participants by Dec 06.
  John S to coordinate.
• RAL/Liverpool to investigate materials for the
  target rim and provide material spec sheets for
  Feb 07 meeting. Ian will coordinate.
• Viability of beam windows (eg between target and
  accelerating cavity) needs to be definitively
  investigated. Plan needs to be in place by
  Dec06. Vinod will coordinate.
• Viability of liquid metal target depends on
  proven design of suitable beam window .
• Cornell may wish to report on this issue at the
  Feb 07 meeting.

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Discussion 9 Z2 Summary

• Topic Action Items
• OMD Jeff Gronberg
• Need to answer question of immersion effects in
  order to make OMD choice need simulation
  benchmarked with experiment
• For SC solenoid need to understand radiation,
  power depo conditions and rad damage (simulation)
• For pulsed OMD need development plan
• Investigate range of zero field on target OMDs
  (MK at KEK)
• Report results and plans of spinning wheel
  experiments at Feb meeting

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Discussion 9 Z2 Summary

• Topic Action Items
• Capture RF Juwen Wang
• Progress.
• Five-cell L-Band SW test structure for capture
  section is under fabrication. Almost all parts
  and subassemblies are either done or in process.
  Still a lot of work need to be done in order to
  complete the final assembly by the end of 2006 or
  the beginning of 2007.
• All of five sets of parts for L-Band RF windows
  are in hands. A completed window is under cold
  test.
• Five vacuum flanges for test structures and
  Couplers have been completed.
• 2. In order to have a solid design for both
  positron and electron sources, we should fund a
  RD program for L-Band TW structures.
• There are many challenges in both electrical,
  mechanical designs as well as fabrication
  aspects
• They are long, the balanced cooling and pumping
  systems needs to be carefully studied and
  inductive brazing technique needs to be practiced
  at SLAC.
• They have low group velocity (as low as 0.16c),
  the impact of big transient effects needs to be
  investigated and tested.
• They work at long beam pulses (1 ms), the
  operational stabilization needs to be studied and
  tested.

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Discussion 9 Z2 Summary

• Topic Action Items
• Target Hall Vinod Bharadwaj
• More activation/damage calculations
• Identify what numbers are needed from the
  calculations
• Figure how to do the simulation which
  program(s) etc.
• identify people to do the simulations
• include detailed layout of hardware
• OMD, SW RF, TW RF, solenoids, shielding
• Define target hall dimension requirements
• target hall occupancy needs
• needed shielding
• what is in the hall and what is on the surface
• scenarios for all the needed repair/replacement
  operations
• KAS target hall
• Does ILC plan to have a central hot cell
  facility?
• e , dumps etc.

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Discussion 9 Z2 Summary

• Topic Action Items
• Undulator Scheme Jim Clarke
• Two sets of conflicting undulator parameters are
  proposed high K and low K. This should be
  resolved as a priority. Start to end simulations
  carried out with a benchmarked code are needed
  from the entrance of the undulator to after the
  positron capture section to understand the
  differences. Results to be reviewed at the next
  meeting.
• In the meantime the UK undulator parameters are
  adopted as the baseline. Period 11.5mm, beam
  aperture 5.85mm, Kx Ky 0.92.
• UK to prototype 4 m module in calendar 2007.
  Beam test plan should be reviewed at the next
  meeting.
• Need magnetic measurements plan for the long
  prototypes
• UK group to review 80 design margin by Feb 07.

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(No Transcript)
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Discussion 9 Z2 Summary

• Topic Action Items
• Conventional Scheme Bharadwaj/Sheppard
• nothing to report

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Discussion 9 Z2 Summary

• Topic Action Items
• Accelerator Physics Gudi Moortgat-Pick
• Collect into a single report dilution and
  depolarization studies what additional issues?
• Propose how to do commissioning w/o Keep Alive
  Source
• Start-to-end tracking w/ spin tracking, schedule
• Fix GigaZ parameters
• Optical Deck for specifications and tolerances
• Status of e tracking studies incl/ e- thru
  undulator insertion (ILC low emit folks,.)

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Discussion 9 Z2 Summary

• Topic Action Items
• Polarization Sabine Riemann
• Report on tools and scope of activities at Feb.
  meeting

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ILC Positron TDR and RD Collaboration Meeting
1 Oxford
Discussion 9 Z2 Summary

• Thanks for coming to this meeting
• and a special thanks to
• Yury Ivanyushenkov and Glyn Northing
• for organizing us
• and to RAL for hosting us
• Next Meeting Asia, M. Kuriki prior to and in
  association with February GDE Beijing Meeting

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Discussion 10 Z2 Summary
ILC Positron System Design and RD Goals in
Support of the TDR
Discussion Every thing is open for discussion
format, discussion leaders, topics, organization,
schedule, ILC Will have a session on Friday to
discuss how this meeting has gone what changes
are required what went well what is clearly not
working. I think that it will take about 3
meetings (1 year ) to settle out on this
process (allow phone and video links to the 3
annual meetings Gudi Mortgat-Pick makes and
maintains group mail server Declare a spokesman
for collaboration J Sheppard, for the time being
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Discussion 10 Z2 Summary
ILC Positron System Design and RD Goals in
Support of the TDR
Discussion, comments, suggestions What
Works What Does Not Work What Do We Do
Differently