Difference between revisions of "JEF meeting, December 11, 2020"
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** Brown crystals have worse transmission curves as function of wavelength compared to others | ** Brown crystals have worse transmission curves as function of wavelength compared to others | ||
** Considering upgrading setup to do measurements for several crystals at once to minimize opening box | ** Considering upgrading setup to do measurements for several crystals at once to minimize opening box | ||
− | ** Compared measurements at 3 wavelengths (360 nm, 420 nm, 650 nm (should be 620 nm by spec) to SICCAS measurements | + | ** Compared measurements at 3 wavelengths (360 nm, 420 nm, 650 nm (should be 620 nm by spec)) to SICCAS measurements |
− | *** Agreement is generally | + | *** Agreement is generally good |
*** 2 crystals just barely below spec at 360 nm in our measurements: plan to accept anyway | *** 2 crystals just barely below spec at 360 nm in our measurements: plan to accept anyway | ||
** Can discolored crystals be recovered? Plan test to expose bad crystals to light? | ** Can discolored crystals be recovered? Plan test to expose bad crystals to light? | ||
*** Some evidence from CMS that crystals with worse transmission curves are less radiation hard? | *** Some evidence from CMS that crystals with worse transmission curves are less radiation hard? | ||
** NPS group is considering illuminating their crystals in situ between runs | ** NPS group is considering illuminating their crystals in situ between runs | ||
+ | ** Only plan to measure transmittance for subset of crystals -- good task for students in summer? | ||
* 2 new modules have been constructed, but more work on brazing needed | * 2 new modules have been constructed, but more work on brazing needed | ||
** Plan to construct ~10 more soon | ** Plan to construct ~10 more soon | ||
Line 47: | Line 48: | ||
* PMT base activities continue, converging on design | * PMT base activities continue, converging on design | ||
** Plan to inject charge using waveform generator into 3x amplifier to check linearity -- but maybe we don't need to use an amplifier? | ** Plan to inject charge using waveform generator into 3x amplifier to check linearity -- but maybe we don't need to use an amplifier? | ||
− |
Latest revision as of 09:21, 14 December 2020
Meeting time and location= 8:30 am EST (JLab time) Bluejeans only
Connection instructions
We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.
- Make sure you have created a BlueJeans account via your JLab CUE account using this link:
- http://jlab.bluejeans.com (You should only need to do this once)
- If connecting via Web Browser: click this link (no passcode is needed):
- If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
- Dial: 1 888 240 2560 (US or Canada only)
- or, List of International Numbers
- If connecting via Polycom unit:
- Dial 199.48.152.152 or bjn.vc
- Enter meeting ID above
Agenda
- SICCAS crystals
- Preparation for module fabrication
- COMCAL tests, TAC running, etc.
- Data analysis
- Simulations
Minutes
Attendees: Igal, Varun, Zisis, Sasha, Phil, Liping, Malte, Jon, Jane, Tim B., Bill B., S.T.
- Visual QA of 2nd batch of crystals complete; Sasha now working on light transmission measurements
- Measurements for 6 clear crystals, 5 brown crystals, 5 yellow crystals
- Brown crystals have worse transmission curves as function of wavelength compared to others
- Considering upgrading setup to do measurements for several crystals at once to minimize opening box
- Compared measurements at 3 wavelengths (360 nm, 420 nm, 650 nm (should be 620 nm by spec)) to SICCAS measurements
- Agreement is generally good
- 2 crystals just barely below spec at 360 nm in our measurements: plan to accept anyway
- Can discolored crystals be recovered? Plan test to expose bad crystals to light?
- Some evidence from CMS that crystals with worse transmission curves are less radiation hard?
- NPS group is considering illuminating their crystals in situ between runs
- Only plan to measure transmittance for subset of crystals -- good task for students in summer?
- 2 new modules have been constructed, but more work on brazing needed
- Plan to construct ~10 more soon
- Crystal price increased do to 25% tariff, impact order of another 500 crystals?
- PMT base activities continue, converging on design
- Plan to inject charge using waveform generator into 3x amplifier to check linearity -- but maybe we don't need to use an amplifier?