SoLID Ecal Weekly 20231012

Information on NPS

Calorimeter page
radiation for NPS: a few 100s/10s rad/hour @ (20-30) deg range with magnet off/on;
typical gain of PMT at operation: 1E3; Preamp: x12
In the active base design, by Vladimir Popov, Fig.6 shows gain vs. LED frequency, show up to 2-3 increase in gain for certain rates.
In report at the 2013 Hall C meeting, slide 12, gain changes at > 50 kHz; base tested during Qweak up to 150 krad

Xiaochao: Should we start considering active base design?
JP: LED test is different from beam, need to be cautious about using LED test results
Paul S.: passive base has its own advantages, should wait for more lessons from NPS
JP: If we need more tests, need to coordinate with Simona on effort planning
Zhiwen/Xinzhan: Weizhi looked at 82-deg data GEM rates. Now will look at 18 deg data.
Xinzhan is testing methods for Fermilab GEM test data
Xiaochao will email Rakitha about finding readout method for LASPD

(Xiaochao, Zhihong, Cunfeng, 8pm ET)

Cunfeng: SDU Ye Tian soldered the resistors on the PMT for the two SDU Shower modules. Zhihong: For the THU module, should have used the base directly from Hamamatsu
Zhihong: asked to study peak integral vs. integration time window (pileup and gain change will show up differently)
Cunfeng:
- Showed test of Chunhui fiber fusion using 1 of the many methods, see slide: [1]
- As can be seen from the slide, the light transfer efficiency is 15% using the method. On slide 8, we have compairson of different fusing method but the highest is only 60%. This is comparable to fiber bundle (basically, the geometrical matching factor between two random circles is already 60%). And so we should go back to our baseline design using Fujikura DDK fiber connectors.
MCPPMT: Zhihong said he sent one to Alexandre.