Checking BGO blocks
Connected 4 channels to LeCroy WaveRunner 6200 A, use LL as the trigger, sum of 4 channels. Histogram Level@X on the SUM(F3), store histograms. The following is the table of pairs of PMT blocks and associated spectra stored on the scope.
PMT R01 F4spectrum00003.txt
PMT R02 F4spectrum00004.txt
PMT R03 F4spectrum00006.txt
PMT R04 F4spectrum00015.txt
PMT R05 F4spectrum00014.txt
PMT R06 F4spectrum00007.txt
PMT R07 F4spectrum00008.txt
PMT R08 F4spectrum00009.txt
PMT R09 F4spectrum00010.txt
PMT R10 F4spectrum00011.txt
PMT R11 F4spectrum00012.txt
PMT R12 F4spectrum00013.txt
PMT L01 F4spectrum00016.txt
PMT L02 F4spectrum00017.txt
PMT L03 F4spectrum00019.txt
PMT L04 F4spectrum00020.txt
PMT L05 F4spectrum00021.txt
PMT L06 F4spectrum00022.txt
PMT L07 F4spectrum00001.txt
PMT L08 F4spectrum00023.txt
PMT L09 F4spectrum00024.txt
PMT L10 F4spectrum00025.txt
PMT L11 F4spectrum00026.txt
PMT L12 F4spectrum00002.txt
We changed threshold on L08 and L09 from -30 to -100 mV.
Map of modules
This is how the modules are connected:
00 R01 R11 R12
04 R03 R02 R10
08 R04 R07 R09
12 R05 R06 R08
16 L09 L05 L01
20 L10 L06 L02
24 L11 L07 L03
28 L12 L08 L04
The left column goes to the leftmost ADC module with address acac, mapped as 300, the middle to the rightmost, address acae, mapped as 302 and the right column goes to the middle ADC module, address acad, mapped as 301.
Triggers come in like this:
00 reserved for Si
01 reserved for Si
02 L01
03 L02
04 L03
05 L04
06 L05
07 L06
08 L07
09 L08
10 L09
11 L10
12 L11
13 L12
14 empty
15 empty
16 reserved for Si
17 reserved for Si
18 R01
19 R02
20 R03
21 R04
22 R09
23 R10
24 R11
25 R12
26 R05
27 R06
28 R07
29 R08
30 empty
31 empty
Rates observed on the blocks
Tested with ORTEC 994 counter and NIM to TTL converters in the NIM bin. Each LL trigger was connected to NIM to TTL and plugged to IN B, time was set to 0.01 scale and PRESET was set to 012, meaning 1 times 10 to the power of 2. The following modifications were made. The source was 30 uCi at Sep 1 2006, equivalent to 10 kBq today. Expected counts from source are 250 Hz per block.
- L1 from 43 to 75, cold rate 434 -> 262, hot rate 800->600
- L2: 152 to 62; 20->260; X->750
- L4: 40 to 80; 300->150; 800->480
- L7: 44 to 71 to 80; 500->400->250; 2000->730->480
- L8: 101 to 148; 1500->226; X->415
- L9: 84 to 162; 5000->264; X->400
- L10: 70 to 43; 80->150; 350->500
- R1: 78 to 98; 320->220; 700->500
- R2: 20 to 38; 330->110; 985->550
- R5: 109 to 141; 1800->400; X->550
- R9: 61 to 87; 400->160; 720->450
The final threshold (THR) /rate cold (CLD) /hot (HOT) /average gain (GAI) follows
PMT THR CLD HOT GAI
L01 075 260 600 1.1
L02 152 260 750 0.6
L03 022 220 730 0.7
L04 080 150 480 1.1
L05 046 250 740 1.5
L06 035 140 550 0.9
L07 080 250 480 0.6
L08 148 230 415 0.9
L09 162 260 400 0.8
L10 043 150 500 0.7
L11 050 190 560 0.7
L12 046 190 550 0.6
R01 098 220 550 1.1
R02 038 110 580 0.5
R03 075 200 520 1.1
R04 072 220 600 0.8
R05 141 400 480 0.5
R06 073 120 440 0.8
R07 049 090 460 tp
R08 087 180 390 0.9
R09 087 160 450 0.9
R10 051 180 560 0.6
R11 051 120 550 0.5
R12 045 180 620 1.5
Apllying criteria HOT/COLD > 2.5 and GAIN >= 0.7 for excellent, and HOT/COLD<2 and GAIN <= 0.7 for BAD, the following groups were made:
EXCELLENT: L03 L04 L05 L06 L10 L11 R01 R03 R04 R06
___OK___ : L01 L02 L08 R02 R07 R08 R10 R11
__BAD___ : L07 L09 L12 R05
To get the excellent ones on the inside, the following swaps have to be made:
- R01 and R05
- L01 to L03; L03 to L07; L07 to L01
- L09 and R12
- L08 and L10
- R03 and R07
- L11 and R08
- L12 and R12 (see below)
- R07 and L07 (same reason)
The final layout will be:
R07 R05
L02 R02
L01 L07
L04 R04
L05 R01
L06 R06
L03 R03
L10 L11
L12 R09
L08 R10
R08 R11
R12 L09
Changed all widths of LL (or UL, in two cases) to 100 ns. Then had to change threshold of another 8 pmts (see below). This is what I ended up with:
L01 R07 037 120 0700 missing CH2
L02 L02 027 500 1400 070 100 600
L03 L01 076 230 0850
L04 L04 079 150 0650
L05 L05 047 300 1000 099 100 570
L06 L06 083 150 0600
L07 L03 022 280 1200 044 120 650
L08 L10 045 160 0800
L09 L12 046 240 0800
L10 L08 145 200 0450 UL
L11 R08 085 260 0700
L12 R12 043 300 1200 116 180 580 missing CH2
R01 R05 141 440 0400 UL
R02 R02 038 180 0800
R03 L07 080 160 0500
R04 R04 072 350 0900 102 150 600
R05 R01 098 200 0800
R06 R06 075 134 0560
R07 R03 075 370 1000 128 150 600
R08 L11 048 400 0900 063 250 700
R09 R09 087 220 0550
R10 R10 054 200 0800
R11 R11 052 200 0800
R12 L09 163 020 0050 044 136 220 missing CH1
Maybe unfortunate choice of R08.
After flood, PMT L09 (R12 originally) has PMT on CH2 not working. To compensate, replacing L12 and L09. This means that L12 is where R12 is sitting, and at L09 we will have L12.
Also, current R03, originally R07, has PMT 2 not working. Moving it out of the way on L01, where L07 is sitting. Hence the second move.
Troubles reading out R03 (block 14) and R10 (block 21). Replacing the electronic box. Redoing the flood (20150902). This is supposed to be the final arrangement.