JEF meeting, December 2, 2022
From GlueXWiki
Meeting time and location:
- 9:30 am EST (JLab time) remote only
- Zoom meeting ID: 161 050 9142 Passcode: 004965
Agenda
- Preparation of parts for FCAL2 modules -- Sasha
- Received 20 + 8 CRYTUR crystals during this week [1]
- Expect to receive 25 more CRYTUR crystals from physics division by the end of this year
- Wrapped CRYTUR crystals: 786
- Available for wrapping: 14 crystals were wrapped during last week
- Mindy (DSG group) continues wrapping crystals
- Mindy will start soldering wires to sockets (short meeting with Chris and Mindy)
- List of available parts
- Received 20 + 8 CRYTUR crystals during this week [1]
- Module fabrication -- Sasha
- Status of fabrication
- Fabricated modules: Total 1362 (14 modules fabricated since last week)
- Testing of PMT dividers -- Sasha / Arshak
- Installation of the FCAL2 detector -- Sasha / Arshak
- Detector installation page
- Updates from the meetings with Tim's group [2]
- Detector cabling and patch panels for the FCAL insert
- Manpower and division of tasks
- Projects for summer students
- Light Monitoring System -- Arshak
- Simulations/Analysis
Minutes
Attendees: Bill, Arshak, Igal, Phil, Susan, Sasha, Olga, Jon, Liping, Zisis, Eugene, Azizah, Jane, Axel, Malte, S.T.
- Have 28 new crystals on hand
- Expect 25 more from physics division by end of year
- Expect another batch from Crytur in May of next year
- Will need to disassemble COMCAL next year
- Mindy from Detector Support Group continues wrapping crystals and has started working on soldering wires to PMT sockets
- Parts for module assembly in good shape
- Grand total number of assembled modules = 1362
- Sasha working on testing PMT dividers to provide feedback to Fernando
- Looked at signals on scope using laser source: intrinsic timing = 2.5 ns rise time w/o amplifier, but signal shape does not change much with amplifier
- With amplifier some pulse deformation for high pulse heights
- Need to test rate dependence
- Test impact of switching noise due to nearby Cockroft-Walton bases from FCAL1?
- Try to learn from NPS experience (larger amplification, see large amount of oscillations/noise but have small signals)
- Copper shielding?
- Also working on finalizing contract with GWU for this work
- Recall that divider design has a 3x amplifier that can be bypassed -- expect only to implement amplifier for inner crystals in the insert
- How to set? Want to keep current draw to a reasonable level
- Instrument COMCAL with new dividers?
- When to start mass production? Deadline: this year for Fernando to put order in
- Sasha to ask Chris S. to order subset of 25 dividers to instrument 5x5 array
- Looked at signals on scope using laser source: intrinsic timing = 2.5 ns rise time w/o amplifier, but signal shape does not change much with amplifier
- Plan for cabling the insert well underway
- Some details about number/position of patch panels need to be worked out
- Make a mock-up?
- Planning for FCAL refurbishment
- Sasha ordered cookies for FCAL
- 200 Pre-cut mylar sheets available at IU
- Light monitoring system: Arshak started checking cross talk on scope using a 3x3 array, injecting light in the center
- Found very low level of leakage (~0.025%)
- Plan to test in beam conditions using PS test stand
- Students: Zisis mentioned that dates for ResFac need be finalized by February
