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ILC Positron TDR and R&D Collaboration Meeting 1: Oxford Summary Discussion and Meeting Critique Discussions 9 and 10. J. C. Sheppard SLAC September 29, 2006. Discussion 9: Z2 Summary. ILC Positron System Design and R&D Goals in Support of the TDR.

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ILC Positron TDR and R&D Collaboration Meeting 1: OxfordSummary Discussion and Meeting CritiqueDiscussions 9 and 10

J. C. Sheppard

SLAC

September 29, 2006

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Discussion 9: Z2 Summary

ILC Positron System Design and R&D 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

2

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Discussion 9: Z2 Summary

ILC Positron System Design and R&D 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 p’type 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 R&D 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 Dec’06. 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 R&D 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 0.16%c), 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.
  • will it be useful for the positron stuff
  • Re-visit two/one target requirement (availability, R&R time,……)

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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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Discussion 9: Z2 Summary

Topic Action Items:

F. Laser-Compton Scheme Masao Kuriki

Develop full design which is compatible with current ILC design:

  • full source accelerator design: OMD, rf, yield calcs
  • Simulation of compton ring dynamics, incl nonlinear beam dynamics
  • Simulation of e+ stacking in the ILC DR.

Optical cavity and laser experiments

„Schedule“ for compton scheme development, now thru completion: how to we get from here to there

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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 r d collaboration meeting 1 oxford

Discussion 9: Z2 Summary

ILC Positron TDR and R&D Collaboration Meeting 1: Oxford

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 R&D 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 R&D Goals in Support of the TDR

Discussion, comments, suggestions

What Works

What Does Not Work

What Do We Do Differently

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