Difference between revisions of "BLTWG Meeting 1/31/2008"
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* What will the downstream end of the vacuum box look like? | * What will the downstream end of the vacuum box look like? | ||
We discussed the following picture for the parts of the vacuum box that see exit electrons. | We discussed the following picture for the parts of the vacuum box that see exit electrons. | ||
| − | + | :* On the long exit slit where degraded electrons exit, simply install a 25 μm stainless steel foil that is glued to the upper and lower plates of the vacuum chamber. | |
| − | + | :* At the exit point of the main beam, weld a rectangular channel to the vacuum box that extends the vacuum region downstream another couple of meters. Franz will produce a concrete proposal and pass it to Tim for comments in time for the next meeting. | |
Revision as of 18:25, 31 January 2008
- Time: 10:00 EST
- Place: EVO and ESNET
- Present: GlueX tagged beam group members
Agenda
- Review of progress on subsystem specifications
- Answers to latest questions from engineering design firms
- Results from analysis of CHESS 2007 run data [1]
- Use of standard beamline quads for the tagger quad
- Progress on the electron beam requirements document
- Date for meeting with machine experts
- Update on communications with YERPHI colleagues
Specifications
We went over the specification documents that have been posted so far on the wiki. Several suggestions were made to fill in missing parts
- Top-level beam specification - add time resolution for tagging coincidences - R. Jones
- Diamond specification - clarify the meaning of the rocking curve width for the entire crystal, increase the thickness tolerance to 5μr - G. Yang
- Tagging spectrometer specification - Add tolerance information from the engineering design spec document - F. Klein
Everyone knows the specification pages they are in charge of, and will work on them for next meeting.
Questions from Engineering Firms
- When will the magnetic field calculations will be updated?
Yang will import several significant geometry changes into his model and redo the 3D field map with TOSCA. Putting the Purcell gap into his model is more difficult because the gap is only a few mm, and the grid spacing is currently larger than this. Franz will do a 2D magnetic field calculation with a smaller grid size, and use that as a basis for estimating what smoothing of field roughness will be achieved by the Purcell gap. That will be used to smooth and irregularities in Yang's results.
- What will the downstream end of the vacuum box look like?
We discussed the following picture for the parts of the vacuum box that see exit electrons.
- On the long exit slit where degraded electrons exit, simply install a 25 μm stainless steel foil that is glued to the upper and lower plates of the vacuum chamber.
- At the exit point of the main beam, weld a rectangular channel to the vacuum box that extends the vacuum region downstream another couple of meters. Franz will produce a concrete proposal and pass it to Tim for comments in time for the next meeting.
