Difference between revisions of "NPS Frame and Infrastructure Meeting (JLab, 1/31/2019)"
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* PMT assembly | * PMT assembly | ||
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* 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 | ||
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::* 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 | ||
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::::* 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 | ||
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* 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 | ||
Revision as of 19:30, 2 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
- Radiation hardness carbon fiber
- place sample in hall
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
