Difference between revisions of "NPS Frame and Infrastructure Meeting (JLab, 1/31/2019)"
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(Added action item on temp logging; requested that carbon fiber sample be sent to Brad S) |
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| − | DISCUSSION MATERIAL | + | '''DISCUSSION MATERIAL''' |
| + | [https://wiki.jlab.org/cuawiki/images/1/15/NPS_mechanical_design_01-31-2019_JLab_meeting.pptx Frame mechanical design] | ||
| − | ACTION ITEMS | + | |
| + | '''ACTION ITEMS''' | ||
* PMT assembly | * PMT assembly | ||
| Line 16: | Line 18: | ||
* Thermal aspects | * Thermal aspects | ||
| − | ::* find out dew point in experimental hall | + | ::* find out dew point in experimental hall (need to make sure water will not condense/drip on components and heat exchanger inside NPS frame) |
* Radiation hardness carbon fiber | * Radiation hardness carbon fiber | ||
| − | ::* place sample in hall | + | ::* place sample in hall (give it to Brad S) |
| + | * Slow Controls / Logging for temperatures | ||
| + | ::* Readout hardware for temp probes TBD(?) | ||
| + | ::* Integrate into 'COMCAL' system ([[Media:comcal_controls.pdf | Control and monitoring]] -- Egiyan?) | ||
| − | SUMMARY NOTES | + | '''SUMMARY NOTES''' |
* PCB Interface (HV, anode current, LED; 25cm(W) x 80cm(H))- updated design to improve access to PMTs | * PCB Interface (HV, anode current, LED; 25cm(W) x 80cm(H))- updated design to improve access to PMTs | ||
| Line 51: | Line 56: | ||
::* discussion about module assembly | ::* discussion about module assembly | ||
::::* many parts of the process (c)should be done by collaboration, some things like pre-shaping of the reflector might be better to do external | ::::* many parts of the process (c)should be done by collaboration, some things like pre-shaping of the reflector might be better to do external | ||
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* Thermal aspects | * Thermal aspects | ||
| Line 62: | Line 66: | ||
::::* if/if not need a dryer depends on temperature that run bottom heat exchanger to get 3kW, humidity in hall usually not that high | ::::* if/if not need a dryer depends on temperature that run bottom heat exchanger to get 3kW, humidity in hall usually not that high | ||
::::* if need a dryer could use a system like Hall A's | ::::* if need a dryer could use a system like Hall A's | ||
| − | |||
* Radiation hardness test of carbon fiber material in hall - preferably during high current running | * Radiation hardness test of carbon fiber material in hall - preferably during high current running | ||
Latest revision as of 12:46, 4 February 2019
DISCUSSION MATERIAL
ACTION ITEMS
- PMT assembly
- as long as use non-magnetic material for the cylindrical tubes holding divider should be ok
- suggestion to use a standoff screw - would move access further to the back for easier access
- Cables, PCB, connectors
- need to check if can also increase vertical size - might hit SHMS water lines
- piece still needed to finalize for cable routing: NPS to front of SHMS
- discussion about grounding - might want to check with prototype and optical path disconnected - still see signal?
- cable making responsibility
- need to identify responsibilities for module assembly
- Thermal aspects
- find out dew point in experimental hall (need to make sure water will not condense/drip on components and heat exchanger inside NPS frame)
- Radiation hardness carbon fiber
- place sample in hall (give it to Brad S)
- Slow Controls / Logging for temperatures
- Readout hardware for temp probes TBD(?)
- Integrate into 'COMCAL' system ( Control and monitoring -- Egiyan?)
SUMMARY NOTES
- PCB Interface (HV, anode current, LED; 25cm(W) x 80cm(H))- updated design to improve access to PMTs
- Calorimeter design still same - plan to work on in Feb/March
- Reflector test for cross talk (Ho San) - result suggests negligible, no tedlar needed
- Calorimeter support - design to be finalized and check with mock-up, plan to work on Feb-April
- New PMT assembly design
- Only need to unscrew in one place now
- Captive screws - cannot fall during (de)installation
- Long cylinder tubes hold divider assembly
- Cables, PCB, and connectors
- PCB has been successfully constructed and tested - ready for construction
- Signal: sma
- HV: Fisher
- LED command connector: Samtec
- Increased box size to have more room for pushing cables left/right - gives more slack for cables, top of box LED connection is fixed
- review of cable routing plans from (11/13-11/15/2018)
- Signal: special patch panel to go from LEMO to BNC - RJ178 seems preferred as less bulky
- HV: multi-channel
- all cable connectors are on top of the detector box - LEMO as fits better
- discussion about making cables and cost
- 20 euro/cable (parts and labor), rate=4 cables/hour (need 250 hours labor)
- drawings and instructions prepared by IPNO
- discussion about module assembly
- many parts of the process (c)should be done by collaboration, some things like pre-shaping of the reflector might be better to do external
- Thermal aspects
- Crystal + external zone (intermediate and heating zones, 500mW/channel -> 540 W)
- Most important is the temperature stability
- Heating zone cooled by two heat exchangers, fans, and one chiller - effectively over-dimension (create a temperature bath) since have no idea about the air flow in that region, many cables
- discussion about temperature monitoring
- planned for front and back of crystals, no space in-between
- discussion about condensation
- if/if not need a dryer depends on temperature that run bottom heat exchanger to get 3kW, humidity in hall usually not that high
- if need a dryer could use a system like Hall A's
- Radiation hardness test of carbon fiber material in hall - preferably during high current running
