Difference between revisions of "JEF meeting, June 28, 2019"
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*** No saturation of mu-metal seen | *** No saturation of mu-metal seen | ||
*** Currently using 1020 steel, could be annealed for ~20-30% improvement | *** Currently using 1020 steel, could be annealed for ~20-30% improvement | ||
| + | *Stacking: insert needs to be well-leveled to distribute load | ||
| + | ** Consider adding ~few mm thick plates (above and below insert) in addition to shims | ||
| + | ** 1/2-1 FTEs next fiscal year to work on frame and other designs aspects | ||
| + | * Cabling/connectors: Hall C style? (lemo for signals?) | ||
| + | * Second arm of pair spectrometer now ready for use for parasitic measurements | ||
| + | ** Josh working on design for assembly to mount 12 crystals at a time | ||
| + | ** Need to consider magnetic field from fringe field of Hall-D solenoid | ||
| + | *Zisis can provide summer undergrad students next year, considering putting graduate student of project | ||
Latest revision as of 09:22, 1 July 2019
Meeting time and location= 1:00 pm EST (JLab time) F228
Connection instructions
We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 370588741. 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:
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- Enter meeting ID above
Agenda
Minutes
Attendees: Wolfgan, Josh, Simon, Sasha, Zisis
- Magnetic field studies more or less complete
- From last time: Sasha suggested moving FCAL assembly 35 cm downstream to reduce field in PMT region for lead tungstate
- Could stack lead glass blocks that we remove from the central region in the outer radius to improve acceptance
- Studies with 350 micron mu-metal shielding + iron housing look promising -- added additional 50 micron mu-metal
- For 60 Gauss longitudinal external field -> 2 Gauss in center of housing+mu-metal shield
- PMT response in central position of 3x3 array flat up to about 40-50 Gauss longitudinal field
- No saturation of mu-metal seen
- Currently using 1020 steel, could be annealed for ~20-30% improvement
- From last time: Sasha suggested moving FCAL assembly 35 cm downstream to reduce field in PMT region for lead tungstate
- Stacking: insert needs to be well-leveled to distribute load
- Consider adding ~few mm thick plates (above and below insert) in addition to shims
- 1/2-1 FTEs next fiscal year to work on frame and other designs aspects
- Cabling/connectors: Hall C style? (lemo for signals?)
- Second arm of pair spectrometer now ready for use for parasitic measurements
- Josh working on design for assembly to mount 12 crystals at a time
- Need to consider magnetic field from fringe field of Hall-D solenoid
- Zisis can provide summer undergrad students next year, considering putting graduate student of project
