Difference between revisions of "General Meeting Summary 3/26/20"
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| − | MAGNET (Charles) | + | '''MAGNET''' (Charles) |
* Work on To-Do List items, e.g. checking measurement vs. 3D model is ongoing - see [https://wiki.jlab.org/cuawiki/images/2/2c/NPS-To-Do-List-2020-revised.pdf NPS To-Do List] for a complete listing | * Work on To-Do List items, e.g. checking measurement vs. 3D model is ongoing - see [https://wiki.jlab.org/cuawiki/images/2/2c/NPS-To-Do-List-2020-revised.pdf NPS To-Do List] for a complete listing | ||
| − | MECHANICAL DESIGN (Bogdan, Steven L.) | + | '''MECHANICAL DESIGN''' (Bogdan, Steven L.) |
* Check and document all kinematics with latest requirements for interferences, e.g. shelf plates on SHMS and new experiment DVCS from Hall A | * Check and document all kinematics with latest requirements for interferences, e.g. shelf plates on SHMS and new experiment DVCS from Hall A | ||
| − | ::* Action Item: collect and send the kinematics information to Steven L. (DVCS: Carlos/Charles, WACS/CPS: Bogdan/David H.) | + | ::* '''Action Item:''' collect and send the kinematics information to Steven L. (DVCS: Carlos/Charles, WACS/CPS: Bogdan/David H.) |
* Document time estimate for rotating the magnet, moving the NPS detector and cabling, moving NPS from one side to the other | * Document time estimate for rotating the magnet, moving the NPS detector and cabling, moving NPS from one side to the other | ||
| − | ::* Action Item: develop possible models for cable layout - might need to get in touch with Brad and Jack | + | ::* '''Action Item:''' develop possible models for cable layout - might need to get in touch with Brad and Jack |
| − | * Corrector magnet fit - Bogdan will work with Paulo on the details | + | * '''Action item:''' Corrector magnet fit - Bogdan will work with Paulo on the details |
| − | FRAME (Carlos) | + | '''FRAME''' (Carlos) |
* Magnetic shield tests - note: max field expected is ~200 Gauss longitudinal | * Magnetic shield tests - note: max field expected is ~200 Gauss longitudinal | ||
| Line 28: | Line 28: | ||
| − | CRYSTALS (Vladimir, Tanja) | + | '''CRYSTALS''' (Vladimir, Tanja) |
* Crytur has been sending more crystals (50+10) over the last weeks - production seems to continue | * Crytur has been sending more crystals (50+10) over the last weeks - production seems to continue | ||
| − | ::* Action Item: Check with CRYTUR if they can expedite outstanding crystal delivery for 250 crystals purchased recently and possible early FY21 procurement for 200 more | + | ::* '''Action Item:''' Check with CRYTUR if they can expedite outstanding crystal delivery for 250 crystals purchased recently and possible early FY21 procurement for 200 more |
* SICCAS shipped a number of crystals - arrival at JLab not yet known | * SICCAS shipped a number of crystals - arrival at JLab not yet known | ||
| − | HV DIVIDERS (Fernando, Alex S.) | + | '''HV DIVIDERS''' (Fernando, Alex S.) |
* New HV dividers with additional amplification that improves linearity have been tested in Hall D and seem to perform well | * New HV dividers with additional amplification that improves linearity have been tested in Hall D and seem to perform well | ||
| − | * Action Items: | + | * '''Action Items:''' |
| − | + | ::* Collect results from Hall D and projected intensity of signals and performance for Hall A/C conditions | |
| − | + | ::* Collect all information on Hall A/C projections, e.g. from Ho-San's simulations for discussion at next meeting | |
| Line 48: | Line 48: | ||
| − | NEXT MEETING: THURSDAY 16 APRIL AT 9:00AM (ET) | + | '''NEXT MEETING: THURSDAY 16 APRIL AT 9:00AM (ET) |
| + | ''' | ||
Latest revision as of 17:42, 26 March 2020
MAGNET (Charles)
- Work on To-Do List items, e.g. checking measurement vs. 3D model is ongoing - see NPS To-Do List for a complete listing
MECHANICAL DESIGN (Bogdan, Steven L.)
- Check and document all kinematics with latest requirements for interferences, e.g. shelf plates on SHMS and new experiment DVCS from Hall A
- Action Item: collect and send the kinematics information to Steven L. (DVCS: Carlos/Charles, WACS/CPS: Bogdan/David H.)
- Document time estimate for rotating the magnet, moving the NPS detector and cabling, moving NPS from one side to the other
- Action Item: develop possible models for cable layout - might need to get in touch with Brad and Jack
- Action item: Corrector magnet fit - Bogdan will work with Paulo on the details
FRAME (Carlos)
- Magnetic shield tests - note: max field expected is ~200 Gauss longitudinal
- measurements show that 0.5mm mu-metal works in that range of magnetic fields
- initial measurements show that PMT signal in magnetic field drops faster than projected by the manufacturer - discussion about possible residual fields, which could cause this effect, also could lead to a transverse field.
- Action item: try to degauss the mu-metal - can be done with Helmholtz coil (see the FCAL-II magnetic field shielding)
- Another option: anneal the mu-metal
- Assembly of the frame started and was well underway until the lab shutdown on March 16 - anticipated delay roughly equal to length of closure
- Crystals and LED connectors sent from JLab arrived in France - should be delivered at Orsay end of the week
CRYSTALS (Vladimir, Tanja)
- Crytur has been sending more crystals (50+10) over the last weeks - production seems to continue
- Action Item: Check with CRYTUR if they can expedite outstanding crystal delivery for 250 crystals purchased recently and possible early FY21 procurement for 200 more
- SICCAS shipped a number of crystals - arrival at JLab not yet known
HV DIVIDERS (Fernando, Alex S.)
- New HV dividers with additional amplification that improves linearity have been tested in Hall D and seem to perform well
- Action Items:
- Collect results from Hall D and projected intensity of signals and performance for Hall A/C conditions
- Collect all information on Hall A/C projections, e.g. from Ho-San's simulations for discussion at next meeting
DISCUSSION (All)
- NPS global delay likely a few months - will evaluate when Labs/Universities return to normal operations
NEXT MEETING: THURSDAY 16 APRIL AT 9:00AM (ET)