BLTWG Meeting 10/2/2008

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  • Time: 9:30 EST
  • Place: EVO and ESNET (with telephone bridge)
  • Connecting: instructions are here
  • Present: Richard J., Jim S., Tim W., Elke A., Igor S., Guangliang Y., Franz K., Dan S., and Alex S.

Agenda

  1. Writeups needed for the pre-brief materials packet - see below
  2. Tim's updated tagger hall drawings
  3. Relative placement of fixed array and microscope - Richard, Franz, Tim
  4. Resolution on tagger pole shape - Jim, Yang
  5. Remaining simulation studies needed for review - Richard
  6. Progress on simulation of the collimators - Sascha



List of documents for review pre-brief package

  1. The general consensus was that we should take chapter 4 in the TDR version 4 and re-write it and then use this as the core of the pre-brief material.
  2. The recommendations from the last review.
  3. A drawing package for the magnet needs to be provided.
  4. An update of the preliminary spec should be given.
  5. Yang's note on the TOSCA and transport studies should be included.
    • Yang's report
    • Dan Sober has agreed to work on improving this document.
  6. Fixed-array hodoscope: Purpose and design status
  7. The June R+D note on the microscope
  8. The pair spectrometer proposal with a few updated.
  9. Plan for what we want to study with diamonds.
  10. Simulations for tagger and beamline- Alex
  11. Update trigger rate and background - Alex

Table of contents for Chapter4 of the TDR V4

https://halldweb.jlab.org/DocDB/0011/001127/002/PPS_Review08.pdf

1 Introduction Richard 1
2 Choice of technique " 3
2.1 Compton back-scatter " 3
2.2 Tagged bremsstrahlung " 6
2.3 Coherent bremsstrahlung " 7
3 Photon source " 11
3.1 Essential features " 12
3.2 Use of collimation " 14
3.3 Choice of raditor " 23
3.4 Crystal quality " 25
3.5 Crystal thickness " 31
3.6 Crystal mount Franz 33
3.7 Crystal alignment and monitoring Franz 35
3.8 Crystal lifetime " 36
4 Electron beam Jim 39
4.1 Beam polarization " 39
4.2 Beam emittance " 41
4.3 Electron beam line optics " 44
4.4 Electron beam dump " 47
4.5 Beam containment and shielding Alex 47
5 Tagging spectrometer Jim 51
5.1 Specifcations " 51
5.2 Magnet " 52
5.3 Spectrometer optics " 54
5.4 Tagger detectors Franz 56 [update]
5.4.1 Focal plane microscope detectors Richard 56
5.4.2 Fixed focal plane array Franz 56
6 Photon Beamline Jim
7 Beam Polarimetry and instrumentation Jim 59
7.1 Spectral Analysis Richard 59
7.2 Pair Spectrometer Jim 59
7.3 Alternate Polarimeters Jim 59