=ALL ABOUT CRIB=
src/circuit.md
1 Circuit and trigger
2 ===================
3 
4 \author HY
5 
6 Circuits for SSD
7 ----------------
8 
9 For the standard Si detectors, we use
10 
11 - Preamplifiers (Physikalishe Nachweisgerate CATSA/Clear pulse 528A)
12 
13 - Main amplifiers (Phys. Nach. MA8000/ORTEC 572)
14 
15 - Fast Amp. or TFA (Clear pulse 16ch Fast amp. 4056, ORTEC 474)
16 
17 - CFD (ORTEC 935)
18 
19 - ADC/TDC(LeCroy or SILENA 3351/3371, CAEN 775/785).
20 
21 About 100 channels are available.
22 
23 Specs
24 -----
25 
26 Preamplifier (CATSA)
27 
28 - Maximum energy...200 MeV (3V)
29 
30 - Time constant...10us
31 
32 - C=1000pF
33 
34 - R_load=200M Ohm (common bias for 16 strips, effectively 12.5 MOhm)
35 
36 Preamplifier (528A)
37 
38 - Time constant...2 - 10 micro-s (customized)
39 
40 - R_load=2 to 10M Ohm
41 
42 Main Amplifier (MA8000)
43 
44 - Gain x 100 (1-10 or 10-100)
45 
46 - Shaping time...1us
47 
48 
49 Circuits for PPAC
50 -----------------
51 
52 The following circuits are used for the PPACs.
53 
54 - ORTEC 8ch Fast Amp
55 
56 - Linear fan in/out
57 
58 - Philips 5-ch CFD
59 
60 - REPIC TDC
61 
62 The anode signal is charge-inverted and used as the trigger. The position of the beam can be determined by the timing of the cathode signals (X1, X2, Y1, Y2), measured by the TDC.
63 
64 Trigger
65 -------
66 
67 The triggers we can use in the standard circuits are:
68 
69 - F1 PPAC
70 
71 - F2 PPAC
72 
73 - F2 SSD
74 
75 - F3 PPAC A or B (called "beam")
76 
77 - SSD OR [OR of arbitrary channels of Si and other detectors]
78 
79 - (beam) AND (SSD OR) [PPAC-SSD coincidence]
80 
81 - beam/n [downscaled beam]
82 
83 - (beam/n) OR (beam AND SSD OR)
84 
85 
86 Questions:
87  - *What is the trigger for your measurement?*
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