BLTWG Meeting 10/2/2008
- Time: 9:30 EST
- Place: EVO and ESNET (with telephone bridge)
- Connecting: instructions are here
- Present:
Agenda
- Writeups needed for the pre-brief materials packet - see below
- Tim's updated tagger hall drawings
- Relative placement of fixed array and microscope - Richard, Franz, Tim
- Resolution on tagger pole shape - Jim, Yang
- Remaining simulation studies needed for review - Richard
- Progress on simulation of the collimators - Sascha
List of documents for review pre-brief package
- 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.
- A short document which summarized the recommendations from the last review and how they were resolved.
- A drawing package for the magnet needs to be provided.
- An update of the preliminary spec should be given.
- Yang's note on the TOSCA and transport studies should be included. Dan Sober has agreed to work on improving this document.
- A description of the present status of the fixed hodoscope.
- The June R+D note on the microscope
- The pair spectrometer proposal with a few updated.
- Plan for what we want to study with diamonds.
Table of contents for Chapter4 of the TDR V4
http://argus.phys.uregina.ca/gluex/DocDB/0011/001127/002/PPS_Review08.pdf
1 Introduction 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 radiator . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.4 Crystal quality . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.5 Crystal thickness . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.6 Crystal mount . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.7 Crystal alignment and monitoring . . . . . . . . . . . . . . . . 35
3.8 Crystal lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4 Electron beam 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 . . . . . . . . . . . . . . . . . 47
5 Tagging spectrometer 51
5.1 Specifcations . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 Magnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
5.3 Spectrometer optics . . . . . . . . . . . . . . . . . . . . . . . . 54
5.4 Tagger detectors . . . . . . . . . . . . . . . . . . . . . . . . . 56
5.4.1 Focal plane microscope detectors . . . . . . . . . . . . 56
5.4.2 Fixed focal plane array . . . . . . . . . . . . . . . . . . 56
5.5 Beam dump optics . . . . . . . . . . . . . . . . . . . . . . . . 57
6 Polarimetry instrumentation 59
7 Operating beam intensity 63