Difference between revisions of "JEF meeting, March 26, 2021"
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:: - [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4981 Test of dividers] [https://halldweb.jlab.org/wiki/index.php/March_23,_2021] | :: - [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4981 Test of dividers] [https://halldweb.jlab.org/wiki/index.php/March_23,_2021] | ||
− | :: - [[File: | + | :: - [[File:Ccal_lemo_connect.jpg|100px|CCAL LEMO connectors]] |
* Data analysis | * Data analysis | ||
* Simulations | * Simulations | ||
+ | |||
+ | =Minutes= | ||
+ | Attendees: Arsak,Phil,Zisis,Sasha,Igal,Liping,Jared,Tim B.,Jon,S.T. | ||
+ | * Delivery of next batch of SICCAS crystals delayed until June | ||
+ | ** Still on track to deliver enough for 40x40 insert by 2023? | ||
+ | * Crytur indicate that they can also produce crystals for us: produce in parallel? | ||
+ | * Liping drafting letter to management focusing on insert; decided to have second letter and/or contact GlueX collaboration board regarding refurbishing FCAL HV | ||
+ | * Sasha continues studies of PMT divider modifications | ||
+ | ** Recent mods seem to alleviate some of the non-linearity problems | ||
+ | *** Not clear this design is appropriate for calorimetry -- current thinking is to have external power supply for amplifier | ||
+ | *** Fernando to come up with new version | ||
+ | ** Still plan to use divider with no extra amplification for CCAL, with optional 3x amplification | ||
+ | ** Sasha will check rate stability | ||
+ | ** Chris S. working on paperwork for loan to U. Regina | ||
+ | * CCAL refurbishment continuing | ||
+ | ** Josh working on CCAL LMS refurbishment: new optical fibers have arrived; working on cutting/polishing/bundling | ||
+ | ** Checked optical contact of optical grease used in CCAL: observed some bubbles not present at time of construction | ||
+ | ** Liping suggested to look for evidence of radiation damage; Sasha indicates CCAL crystals look uniform (no obvious evidence of radiation damage) | ||
+ | *Igal preparing simulation for Jared for testing signal PDFs for dark scalar searches and to study background | ||
+ | ** Want to study how important signal shape is: would a single gaussian be sufficient, or is a more complicated function needed? | ||
+ | *** Estimate level of systematic bias | ||
+ | ** Possible resolution improvements due to kinematic fit could improve sensitivity | ||
+ | * Sasha reported discussion with Fernando regarding replacing FCAL Cockroft-Walton HV with design common with what we are planning for insert | ||
+ | ** About 30% of the FCAL HV channels have failed so far | ||
+ | *** Given cooling requirements for insert, doing repairs on the bases will be more cumbersome for FCAL-II | ||
+ | ** Fernando seems to agree that moving away from the Cockroft-Walton approach is the way to go | ||
+ | ** Need cost estimate |
Latest revision as of 15:28, 26 March 2021
Meeting time and location= 9:00 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)
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- Enter meeting ID above
Agenda
- SICCAS crystals
- COMCAL tests, TAC running, etc.
- Data analysis
- Simulations
Minutes
Attendees: Arsak,Phil,Zisis,Sasha,Igal,Liping,Jared,Tim B.,Jon,S.T.
- Delivery of next batch of SICCAS crystals delayed until June
- Still on track to deliver enough for 40x40 insert by 2023?
- Crytur indicate that they can also produce crystals for us: produce in parallel?
- Liping drafting letter to management focusing on insert; decided to have second letter and/or contact GlueX collaboration board regarding refurbishing FCAL HV
- Sasha continues studies of PMT divider modifications
- Recent mods seem to alleviate some of the non-linearity problems
- Not clear this design is appropriate for calorimetry -- current thinking is to have external power supply for amplifier
- Fernando to come up with new version
- Still plan to use divider with no extra amplification for CCAL, with optional 3x amplification
- Sasha will check rate stability
- Chris S. working on paperwork for loan to U. Regina
- Recent mods seem to alleviate some of the non-linearity problems
- CCAL refurbishment continuing
- Josh working on CCAL LMS refurbishment: new optical fibers have arrived; working on cutting/polishing/bundling
- Checked optical contact of optical grease used in CCAL: observed some bubbles not present at time of construction
- Liping suggested to look for evidence of radiation damage; Sasha indicates CCAL crystals look uniform (no obvious evidence of radiation damage)
- Igal preparing simulation for Jared for testing signal PDFs for dark scalar searches and to study background
- Want to study how important signal shape is: would a single gaussian be sufficient, or is a more complicated function needed?
- Estimate level of systematic bias
- Possible resolution improvements due to kinematic fit could improve sensitivity
- Want to study how important signal shape is: would a single gaussian be sufficient, or is a more complicated function needed?
- Sasha reported discussion with Fernando regarding replacing FCAL Cockroft-Walton HV with design common with what we are planning for insert
- About 30% of the FCAL HV channels have failed so far
- Given cooling requirements for insert, doing repairs on the bases will be more cumbersome for FCAL-II
- Fernando seems to agree that moving away from the Cockroft-Walton approach is the way to go
- Need cost estimate
- About 30% of the FCAL HV channels have failed so far