SoLID Ecal Weekly 20231012
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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.
- Hamlet's plot, slide 12, gain changes at > 50 kHz; base tested during Qweak up to 150 krad
Discussion with SDU+THU groups
(Xiaochao, Zhihong, Cunfeng)
- 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.
