Difference between revisions of "JEF meeting, June 28, 2019"
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=Agenda= | =Agenda= | ||
[https://halldweb.jlab.org/JEF Magnetic shielding studies] | [https://halldweb.jlab.org/JEF Magnetic shielding studies] | ||
+ | |||
+ | =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 |
Revision as of 09:16, 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.
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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