recent results marc & qian. outline 3d uniformity scan end cap tof counter test result report of...
Post on 22-Dec-2015
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TRANSCRIPT
• We used USTC DAQ system to do the 13x13 3D uniformity scan = 171 total files, which covers a 3mm x 3mm square area. The reason for 171 is because we repeated the origin measurement three times (1st time is at initial origin, 2nd time is on the grid, 3rd time is final file.)
13
12
11
10
9
8
7
6
5
4
3
2
1
14
26
39
27
40
52
65
53
66
78/79
164
163
150
149
136
135
122
121
108
107
94
93
80
170
157
156
143
142
129
128
115
114
101
100
87
86
X
Y
(0.180,0.215)
Origin (0.240,0.275)
(0.300,0.335)
Summary / Conclusion:
1. We did this test before we move the “Moon” Box.2. We know from our 2 D linear X,Y scans via O-Scope, that we are able to
achieve uniformity on the order of ~4%.3. We now conclude that the USTC/main DAQ interface requires more fine
tuning.4. We know from the ref-PMT data (reading from faster O-Scope) that the
laser is quite stable.5. (To be continued…)
Hole A
Hole B
We set the HV of EC and Barrel TOF separately to achieve both gain = 1E+5.
The Barrel TOF signal’s PH is 165.1 mV.
EC TOF Signal PH (mV) Wiggle fiber
Hole A 161.1 160~161 mV
Hole B 260.0 255~260 mV
Hole AHole B
For Hole B, if we use solenoid 3 with 63% transparency, the PH is 164 mV
Summary / Conclusion:
1. According the EC TOF Fiber installation method, the both holes are easy to achieve.
2. Using Hole A, we don’t need to use solenoid 3 or filter, the EC TOF and Barrel TOF signals’ PH are almost the same, and Hole A is more stable than Hole B when we wiggled the fiber.
Marc & Qian老善 刘倩
Before we moved the Moon Box, we tested the Ref-PMT PH:
Origin PMT (mV) PH (mV)
CH1(east) (0.305,0.330) 460 202.0
CH2(west) (0.240,0.275) 486 202.0
We’ve moved the “Moon Box” into the rack.
Then we tested the PH:CH1 (460): 185.8 mVCH2 (486): 195.8 mV