Difference between revisions of "General Meeting Summary 10/5/17"
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| + | NPS COLLABORATION MEETING - JANUARY 2017 | ||
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| + | * Date will be in the week of the Hall A/C meeting - exact choice will depend on NPS meeting agenda | ||
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| + | * Please send suggestions for talks by 19 October to hornt@cua.edu | ||
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| + | * Note: Compact Photon Source Meeting will be together with NPS meeting | ||
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NPS SUBSYSTEM UPDATES | NPS SUBSYSTEM UPDATES | ||
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::* OU got a quote for HV divider components (Advance Assembly) - checking the details, if all looks ok, will go ahead with the full procurement | ::* OU got a quote for HV divider components (Advance Assembly) - checking the details, if all looks ok, will go ahead with the full procurement | ||
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* PbWO4 Crystals | * PbWO4 Crystals | ||
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::::* Initial results of subset of two suggest low light yield compared to requirement | ::::* Initial results of subset of two suggest low light yield compared to requirement | ||
::::* Reference crystal results have been stable to 0.5 pe/MeV for more than a year | ::::* Reference crystal results have been stable to 0.5 pe/MeV for more than a year | ||
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* NPS magnet | * NPS magnet | ||
::* All still seems on schedule for yoke and main coil delivery later this year | ::* All still seems on schedule for yoke and main coil delivery later this year | ||
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* Frame | * Frame | ||
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::* New graduate student implementing geometry in simulation to study effect of material | ::* New graduate student implementing geometry in simulation to study effect of material | ||
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NEXT MEETING: THUR 2 NOVEMBER at 9:00 AM (EST) | NEXT MEETING: THUR 2 NOVEMBER at 9:00 AM (EST) | ||
Latest revision as of 13:32, 6 October 2017
NPS COLLABORATION MEETING - JANUARY 2017
- Date will be in the week of the Hall A/C meeting - exact choice will depend on NPS meeting agenda
- Please send suggestions for talks by 19 October to hornt@cua.edu
- Note: Compact Photon Source Meeting will be together with NPS meeting
NPS SUBSYSTEM UPDATES
- PMTs and HV Dividers
- New PMTs were delivered with slightly different sockets - requires machining (or, if doesn't work get back to Hamamatsu)
- 100 of the new PMTs were given to Hall D for assembly and tests
- 1-2 new PMTs ready to be shipped to IPN-Orsay for assembly and tests
- Assembly drawings of PMT+crystal module from HyCal are being collected - action item: get the original drawings from designers
- similar to HMS calorimeter, but dimensions different and PbWO4 more fragile
- found that in actual HyCal PMTs were NOT glued to crystal (that was only done for prototype modules)
- OU got a quote for HV divider components (Advance Assembly) - checking the details, if all looks ok, will go ahead with the full procurement
- PbWO4 Crystals
- Discussion of visual inspection and dimension measurements with caliper of box#3 (10 crystals) of the first set of 160 SICCAS crystals
- Visual inspection shows that about half of these crystals have bubbles and/or chipped edges - according to data the company sent, this does not affect optical properties
- Action item: post the data the company sent
- Discussion about alternative measurement methods to make nondestructive measurement of crystal dimensions that is safer (and potentially faster) than measuring with caliper
- Note: current labor for measuring dimensions with calipers for 10 crystals (1 box) is 1 week
- Best choice for purchasing a measurement system seems a dimension gage with tough probe
- Probe has a sphere/ball tip at end, so can slide along crystal without visible scratching
- Current plan is to measure transverse dimensions at three points along the crystal moving the probe
- There is also an existing automated dimension measurement instrument in the machine shop owned by accelerator. For Hall A DVCS, this facility was available to the collaboration. This seems to have changed and now one cannot perform measurements oneself any longer.
- What is the cost for using machine shop or a local company to make dimension measurement of 100s of crystals?
- Initial crystal optical measurements performed at CUA for SICCAS 5031-5040 (box #3, first set of 160 pieces delivered in Sept 2017)
- Initial results of subset of two suggest low light yield compared to requirement
- Reference crystal results have been stable to 0.5 pe/MeV for more than a year
- NPS magnet
- All still seems on schedule for yoke and main coil delivery later this year
- Frame
- Design work ongoing including prototype module design (PMTs will not be glued to crystal)
- Evaluation of specs for LED curing system
- New graduate student implementing geometry in simulation to study effect of material
NEXT MEETING: THUR 2 NOVEMBER at 9:00 AM (EST)