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Discussion on EMI for Vertex Detector [message #171] Tue, 07 December 2004 17:34
Messages: 12
Registered: November 2004
Location: SLAC
Here are notes from a meeting at SLAC, held Dec. 7, 2004 prompted by some discussions with Chris Damerell:
Attending: Nick Sinev, John Jaros, Ray Arnold, Tim Nelson, Marty Breidenbach, Jim Brau, Mike Woods

  1. related presentations planned for MDI Workshop:
    • Marty: SLD experience with VXD2, VXD3
    • Marty: Signal Processing / DAQ planned for most of SiD (excluding very forward region and VXD); having 4 sample/hold per train (occupancy will be ok) for each detector pixel and then reading out between trains
    • Mike (or other victim to be found): review LCWS 2004 talks for DAQ session and summarize signal processing / DAQ plans presented there
    • Nick: describe current status of VXD3, including readout system, and describe a beam test that can be carried out in ESA where we can provide 10Hz beam with single bunches, 2e10 charge, with bunch lengths in range 100 microns to 1mm (SLD bunch length was 1mm)
  2. other talks planned in beam rf session:
    • PEP-II higher-order mode beampipe heating; Mike Sullivan (to be confirmed)
  3. other talk possibilities for beam rf session:
    • BaBar electronics: EMI mitigation in vertex or wire chamber? I'll contact Natalie Roe (also maybe Dave Nelson) for the vertex chamber and Mike Kelsey for the wire chamber and see if there might be something of interest to present
    • UA1 VXD experience: I talked to Tom Markiewicz who recalls that the initial beam pipe was too thin to have enough skin depths for the higher beam rf harmonics; some possible contacts on this: Kate Morgan (friend of Nan and I'll ask Nan how to contact), Guryn at Brookhaven, Ann Kiernan (retired?). Also may be documented in a NIM paper?
    • theory talk on calculating HOMs: Perry Wilson?
    • rf shield included in NLC ZDR in "pant-leg" region of the crossing angle geometry?
  4. other notes:
    • The EMI observed with SLD VXD3 was not in shifting/clocking of CCDs (this clocking was always blanked out around beamtime and could be a separate problem if there were no blanking); problem was with the fiber optic link losing its phase lock (there was no fiber optic link for VXD2)
    • need to check for additional notes/documentation on VXD3 EMI problem: Vavra? Mentioned in any of the UK theses on VXD?

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