Difference between revisions of "Wednesday, May 1, 2013 2pm EST - Compton"
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(New page: A possible agenda could include: 1) DAQ proposal (Bob) 2) Detector proposal (Alex) 3) Status of Compton e- detector (Rob/Alex) 4) Diamond detector quotes (Juliette) 5) Future work) |
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− | + | Previous meeting: [[Thursday, March 28, 2013 1pm EST - Compton]] | |
− | + | == Agenda == | |
− | + | ||
− | + | # DAQ proposal [https://userweb.jlab.org/~rom/compton_etrig.pdf trigger], [http://hallaweb.jlab.org/equipment/daq/compton_coda3.pdf coda] (Bob) | |
− | 4) Diamond detector quotes (Juliette) | + | # Detector proposal (Alex) |
− | + | # Status of Compton e- detector [https://userweb.jlab.org/~camsonne/Edet/Compton_eDet_Status_June2010-v2.docx.pdf 2010 report] (Alex/Vladas/Rob) | |
+ | ## Compare to [https://userweb.jlab.org/~rob/hacompton/2013-02-12.e-detector.pdf source tests], slide 4 | ||
+ | # Diamond detector quotes [https://userweb.jlab.org/~crowder/Compton/quotes_detector_companies.pdf summary] (Juliette) | ||
+ | # Future work | ||
+ | |||
+ | <br> | ||
+ | |||
+ | == Minutes == | ||
+ | |||
+ | # DAQ proposal (Bob) | ||
+ | ## Electronics group meeting (Ben Raydo, Chris Cuevas, Alex, Sirish, Bob) | ||
+ | ## Ben will write engineering specs after Bob writes "physicist" specs | ||
+ | ## revised with feedback from Kent and Wouter Deconinck | ||
+ | ## a prototype could be built in 14 weeks FTE (~8 months real time) for 7K$ | ||
+ | ## based on the JLab CODA-3 VXS pipelined FPGA-programmable technology - is this a standard size? 10x bigger than V1495 - 18x192 inputs | ||
+ | ## Bob will send out revised versions once they are completed | ||
+ | ## SOLID will need things like this, so this is like a SOLID test stand; elec. group happy to work on it | ||
+ | # Detector proposal (Alex) | ||
+ | ## For proposal, I did not submit it. I was planning to focus on gaseous detector since it was new but | ||
+ | ## it seems low pressure detectors work with highly ionizing particle (ions beams or protons), the number of primary I got from low pressure detector was too little | ||
+ | ## need more information and simulation and optimize pressure and thickness of windows to make a proposal | ||
+ | ## but can be at higher pressure, except in vacuum - tradeoff with thicker window (backgrounds) | ||
+ | # Status of Compton e- detector (Alex/Vladas/Rob) | ||
+ | ## Detector was cabled and we look a bit at analog signal with Vladas. It is quite noisy right now out from the box I guess we can improve a little bit by checking ground and shielding but we are still far to be able to lower threshold to improve efficiency. Signal for MIP is around 12 mV. | ||
+ | ## noise was 15-20 mV with 3/4 trigger already | ||
+ | ## from source tests in Hall put detector in can - like a Faraday cage - in beamline now, flanges aren't attached... | ||
+ | ## I picked up one QWAD (amplifier, discriminator, shaper) from Dave Gaskell to test it. I guess we will try to power it and try to check if it would work with our detector. But I think it is mostly coming from detector and bus | ||
+ | ## Vladas mentioned that the QWAD feature a time over threshold function and that cutting on the pulse length reduced a lot of noise | ||
+ | ## Attached is a [https://userweb.jlab.org/~camsonne/Edet/Compton_eDet_Status_June2010-v2.docx.pdf document about noise], you can go through it if you have not seen it | ||
+ | ## Take detector apart - test everything separately (except no noise outside of hall!) flex cables are antennas :) | ||
+ | ## Do tests at TRIUMF? | ||
+ | ### The guy - what's his name? - may be too busy - Wim will ask around | ||
+ | ### QWAD/Hall A electronics/spare detector (to measure capacitance, etc.) | ||
+ | ## Check QWADs in Hall A first to see if it is better than Hall A electronics | ||
+ | # Diamond detector quotes (Juliette) | ||
+ | ## Summary - about $50k for full detector 46 mm long (wide?) (same as Si strip detector) | ||
+ | ## $50k to replace what we have now | ||
+ | ## Silicon was $16-20k for thin, thick was much higher | ||
+ | ## wait for Si strip detector tests | ||
+ | ## push forward to get diamond sample? | ||
+ | ## only test charge collection distance if going with Applied Diamond | ||
+ | ## standard detector - rather than a specialized | ||
+ | ## they have prototypes from Hall C | ||
+ | ## How big can they make it? | ||
+ | ### improved estimates of how big we want it | ||
+ | ### synchrotron radiation | ||
+ | # Future work | ||
+ | ## Vladas and Alex will come up with a list of tests to possibly be done at TRIUMF | ||
+ | ## Juliette will calculate the length and synchrotron radiation | ||
+ | ## Need to replace HV connectors with electronic group | ||
+ | ## Reduce noise on detector and try to check efficiency with trigger scintillator | ||
+ | ## Adapt QWAD to spare detector | ||
+ | |||
+ | Next meeting in 4 weeks, expect a DOODLE poll in ~3.5 weeks :) | ||
+ | |||
+ | |||
+ | <br><br> Return to [[Compton]] |
Latest revision as of 18:36, 1 May 2013
Previous meeting: Thursday, March 28, 2013 1pm EST - Compton
Agenda
- DAQ proposal trigger, coda (Bob)
- Detector proposal (Alex)
- Status of Compton e- detector 2010 report (Alex/Vladas/Rob)
- Compare to source tests, slide 4
- Diamond detector quotes summary (Juliette)
- Future work
Minutes
- DAQ proposal (Bob)
- Electronics group meeting (Ben Raydo, Chris Cuevas, Alex, Sirish, Bob)
- Ben will write engineering specs after Bob writes "physicist" specs
- revised with feedback from Kent and Wouter Deconinck
- a prototype could be built in 14 weeks FTE (~8 months real time) for 7K$
- based on the JLab CODA-3 VXS pipelined FPGA-programmable technology - is this a standard size? 10x bigger than V1495 - 18x192 inputs
- Bob will send out revised versions once they are completed
- SOLID will need things like this, so this is like a SOLID test stand; elec. group happy to work on it
- Detector proposal (Alex)
- For proposal, I did not submit it. I was planning to focus on gaseous detector since it was new but
- it seems low pressure detectors work with highly ionizing particle (ions beams or protons), the number of primary I got from low pressure detector was too little
- need more information and simulation and optimize pressure and thickness of windows to make a proposal
- but can be at higher pressure, except in vacuum - tradeoff with thicker window (backgrounds)
- Status of Compton e- detector (Alex/Vladas/Rob)
- Detector was cabled and we look a bit at analog signal with Vladas. It is quite noisy right now out from the box I guess we can improve a little bit by checking ground and shielding but we are still far to be able to lower threshold to improve efficiency. Signal for MIP is around 12 mV.
- noise was 15-20 mV with 3/4 trigger already
- from source tests in Hall put detector in can - like a Faraday cage - in beamline now, flanges aren't attached...
- I picked up one QWAD (amplifier, discriminator, shaper) from Dave Gaskell to test it. I guess we will try to power it and try to check if it would work with our detector. But I think it is mostly coming from detector and bus
- Vladas mentioned that the QWAD feature a time over threshold function and that cutting on the pulse length reduced a lot of noise
- Attached is a document about noise, you can go through it if you have not seen it
- Take detector apart - test everything separately (except no noise outside of hall!) flex cables are antennas :)
- Do tests at TRIUMF?
- The guy - what's his name? - may be too busy - Wim will ask around
- QWAD/Hall A electronics/spare detector (to measure capacitance, etc.)
- Check QWADs in Hall A first to see if it is better than Hall A electronics
- Diamond detector quotes (Juliette)
- Summary - about $50k for full detector 46 mm long (wide?) (same as Si strip detector)
- $50k to replace what we have now
- Silicon was $16-20k for thin, thick was much higher
- wait for Si strip detector tests
- push forward to get diamond sample?
- only test charge collection distance if going with Applied Diamond
- standard detector - rather than a specialized
- they have prototypes from Hall C
- How big can they make it?
- improved estimates of how big we want it
- synchrotron radiation
- Future work
- Vladas and Alex will come up with a list of tests to possibly be done at TRIUMF
- Juliette will calculate the length and synchrotron radiation
- Need to replace HV connectors with electronic group
- Reduce noise on detector and try to check efficiency with trigger scintillator
- Adapt QWAD to spare detector
Next meeting in 4 weeks, expect a DOODLE poll in ~3.5 weeks :)
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