https://wiki.jlab.org/cuawiki/index.php?title=General_Meeting_Summary_7/29/21&feed=atom&action=historyGeneral Meeting Summary 7/29/21 - Revision history2024-03-28T11:10:16ZRevision history for this page on the wikiMediaWiki 1.35.7https://wiki.jlab.org/cuawiki/index.php?title=General_Meeting_Summary_7/29/21&diff=4029&oldid=prevHornt: Created page with "PARTICIPANTS: Aaron Brown, Arshak Asaturyan, Fernando Barbosa, Bogdan Wojtsekhowski, Brad Sawatzky, Brannon Semp, Carlos Munoz-Camacho, Carlos Yero, Charles Hyde, Rolf Ent, Ha..."2021-07-30T20:38:34Z<p>Created page with "PARTICIPANTS: Aaron Brown, Arshak Asaturyan, Fernando Barbosa, Bogdan Wojtsekhowski, Brad Sawatzky, Brannon Semp, Carlos Munoz-Camacho, Carlos Yero, Charles Hyde, Rolf Ent, Ha..."</p>
<p><b>New page</b></p><div>PARTICIPANTS: Aaron Brown, Arshak Asaturyan, Fernando Barbosa, Bogdan Wojtsekhowski, Brad Sawatzky, Brannon Semp, Carlos Munoz-Camacho, Carlos Yero, Charles Hyde, Rolf Ent, Hakob Voskanyan, Hamlet Mkrtchyan, Julie Roche, Marie Boer, Paulo Medeiros, Stephen Wood, Stephen Lassiter, Tanja Horn, Tristan Anderson, Vardan Tadevosyan, Vladimir Berdnikov, ALexandre Camsonne<br />
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'''HV DIVIDER UPDATES''' (Vladimir, Carlos Y., Fernando, Julie)<br />
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* Linearity Tests vs. rate<br />
::* No optical filter (glass, neutral density) with different laser (405nm) intensity<br />
::* One optical filter and <br />
::* Different optical filters and laser intensity FIXED<br />
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* Results suggest that linearity of the divider is very good up to a few MHz<br />
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* Currently measuring linearity of amplifier itself - inject signal<br />
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* one optical filter (from UV to visible) for which one can set optical density to specify attentuation<br />
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* '''Action items'''<br />
::* Complete the linearity test of the amplifier<br />
::* Work on next divider revision taking into account needs for new LV cabling strategy<br />
::* Ship PMTs from OU to JLab - need to remove sockets; could also just ship the sockets <br />
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'''LV CABLING STRATEGY''' (Carlos M., IJCLab-Orsay team)<br />
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* Have a working option for LV cabling that maintains easy access for changing PMTs - issue: many cables --> have been exploring alternatives to reduce number of cables<br />
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* Follow up from last meeting: daisy-chaining (power PMTs in parallel) the LV vertically<br />
::* 18 serial connectors<br />
::* still need to check on voltage drop across chain to evaluate what is possible<br />
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* Challenge with daisy-chaining: maintenance (access to PMTs and changing PMTs)<br />
::* space available for board, connectors, etc.<br />
::* connector plug/unplugging very difficult<br />
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* '''Action items''':<br />
::* voltage drop across chain - from connection to connection (Bogdan)<br />
::* explore different connector - Bogdan's suggestion of a flat/twisted connector - challenge here could be mechanical<br />
:::* Bogdan/Fernando provide information on connectors<br />
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'''DSG UPDATES''' (Aaron)<br />
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* Hardware interlock system<br />
::* Chiller interlock - includes a remote power controller (check if uses optical isolators - high failure rate in high power halls)<br />
::* CAEN crate interlock - may want to add a label that CAEN CPU interlock remains in OPEN position<br />
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* '''Action item'''s:<br />
::* check if remote power controller uses optical isolator<br />
::* check on labeling for CAEN CPU<br />
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* '''Action item (Fernando)''':<br />
::* check on way to monitor/interlock anode current PMT or similar, e.g., DC level or so; may not need to do that for all 1200 channels<br />
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'''MECHANICAL''' (Paulo, Steven L.)<br />
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* Much progress and most components are in procurement or in house<br />
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* Remaining is cable routing and roof block modification to get cables into the SHMS hut<br />
::* constraint: cables have already been fabricated<br />
::* constraint on SHMS: with this configuration will be limited to ~39deg<br />
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* NPS power supply requisition has been submitted<br />
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'''DDVCS WITH NPS''' (Marie)<br />
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* Presentation on ideas for DDVCS with NPS <br />
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'''NEXT MEETING: THURSDAY AUGUST 26 AT 9AM ET'''</div>Hornt