Difference between revisions of "CLAS12 R1 S1 QA"

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Revision as of 21:37, 17 April 2013

HV burn in

Begin burn in after at least 3 volume changes.


File:High Voltage Region 1 Sector 1 data.xls


Step 1: Set Voltage to 50 volts on all channels. Probe HVB to be sure that all sense, field, and guard wires have a voltage. (You should set current threshold to 10 microAmps on the HV supply)

Step 2: While monitoring the current, ramp the HV to the following

G:F:S= 525,-700,700

Step 3: Begin to take data recording the time and sense wire current as you ramp up the sense wire HV to 1400 volts while restricting the current draw to less than 10 micraAmps.


keep current under 10 micro amps while moving sense voltage up to 1400

Measured Sense wire output

CLAS12_R1_S1_QA_wireOut


Sense Wire Scope pictures on DAQ machine

Cosmic Runs

CLAS12R1_CosmicTestStand

3811

Cosmic rays were used to measure drift chamber time spectra with respect to scintillators placed above and below the drift chambers (more details are at the wiki location CLAS12R1_CosmicTestStand)


CLAS6 DCrawTDCspectrum.gif R3811 TDC51 Time.png R3831 3833TDC51 TimeL1W9.png JLabR1Chambr4.png
Fig 23 from "The CLAS drift chamber system", M. Mestayer, et. al., NIM A, Volume 449, Issues 1–2, 11 July 2000, Pages 81–111 cosmic run from 1/10 - 1/14. Signal cable 4 (ch. 48-63). 16 channels with leading edge discriminators (-80 mV, 100 ns pulse width). Cosmics runs with lower discriminator thresholds Chamber 4 at JLab

DChitDisplay 3831.png

R3811_TDCspectra

3833

R3833_TDCspectra

R3833_Efficiency1

3834

R3834_TDCspectra

Cosmic measurements

Run # Date Description
3806 1/10/13 3 hour cosmic run, 16 channels with leading edge discriminators (-80 mV, 100 ns pulse width)
3809 1/10/13 cosmic run on 1/10. Signal cable 4 (ch. 48-63). 16 channels with leading edge discriminators (-80 mV, 100 ns pulse width).
3810 1/10/13 cosmic run from 1/10 - 1/14. Signal cable 4 (ch. 48-63). 16 channels with leading edge discriminators (-80 mV, 100 ns pulse width). Scintillator paddle F1/F2 on table above Sector 1, paddle I1/I2 below.
3811 1/10/13
3831 2/1/13 Changed disciminator from 80 mV to 60 mV, We improved the window, installed HV & STB boards, purged and started taking cosmic data again, DC is sandwhiched between 2 scints with PMTs aligned (PMT on only one end of Scint is turned on)
3833 2/4/13 Changed disciminator from 60 mV to 30 mV
3834 2/11/13 Changed disciminator from 30 mV to 60 mV
3835 2/19/13 Changed disciminator from 60 mV to 20 mV

Using ADB crate

72 PMT I2
74 PMT F2
75 PMT F1
00 U1 L2W1
01 U2 L4W1
02 U3 L6W1
03 U4 L1W1
04 U5 L3W1
05 U6 L5W1
06 U7 L2W2
07 U8 L4W2
08 U9 L6W2
09 U10 L1W2
10 U11 L3W2
11 U12 L5W3
12 U13 L2W3
13 U14 L4W3
14 U15 L6W3
15 U16 L1W3
16 U17 L3W3
17 U18 L5W3
18? U19 L2W4
19 U19 L4W4
20 U20 L6W4
21 U21 L1W4
22 U22 L3W4
23 U23 L5W4
24 U23 L2W5
25 U24 L4W5
26 U25 L6W5
27 U26 L1W5
28 U27 L3W5
29 U28 L5W5
30 U29 L2W6
31 U30 L4W6
32 U31 L6W6
33 U32 L1W6
34 U33 L3W6
35 U34 L5W6
36 U35 L2W7
37 U36 L4W7
38 U37 L6W7
39 U38 L1W7
40 U39 L3W7
41 U40 L5W7
42 U41 L2W8
43 U42 L4W8
44 U43 L6W8
45 U44 L1W8
46 U45 L3W8
47 U46 L5W8
48 U47 L2W9
49 U48 L4W9
50 U49 L6W9
51 U50 L1W9
52 U51 L3W9
53 U52 L5W9
54 U53 L2W10
55 U54 L4W10
56 U55 L6W10
57 U56 L1W10
58 U57 L3W10
59 U58 L5W10
60 U59 L2W11
61 U60 L4W11
62 U61 L6W11
63 U62 L1W11


Run # Date Description
4008 4/11/13 set ADB threshold to 100 , installed all 6 STB connectors, key was on the left as you face the ADC crate. Two top PMTs and one bottom PMT were in coincidence. The rate was about 0.5 Hz. at 9:41 on 4/12/13 I observed no voltage coming out of the discriminator monitor, the fuses were NOT blown. Hits seemed to disappear in the data. I recycled the ADB crate power and saw 100 mV on the discriminator monitor. Start a new run 40009
4009 4/12/13 ADC threshold at 100 mV
4014 4/16/13 Removed cable from J10 connector on ADB crate and becan a cosmic run, the ROC & EB1 segfaulted after 57702 events

Readout Map

Wire PostAmpOut (CH 1-96) TDC Channel
L W
5 1 1 1
3 1 2 2
1 1 3 3
6 1 4 4
4 1 5 5
2 1 6 6
5 2 7 7
3 2 8 8
1 2 9 9
6 2 10 10
4 2 11 11
2 2 12 12
5 3 13 13
3 3 14 14
1 3 15 15
6 3 16 16
4 3 17 17
2 3 18 18
5 4 19 19
3 4 20 20
1 4 21 21
6 4 22 22
4 4 23 23
2 4 24 24
5 5 25 25
3 5 26 26
1 5 27 27
6 5 28 28
4 5 29 29
2 5 30 30
5 6 31 31
3 6 32 32
1 6 33 33
6 6 34 34
4 6 35 35
2 6 36 36
5 7 37 37
3 7 38 38
1 7 39 39
6 7 40 40
4 7 41 41
2 7 42 42
5 8 43 43
3 8 44 44
1 8 45 45
6 8 46 46
4 8 47 47
2 8 48 48
5 9 49 49
3 9 50 50
1 9 51 51
6 9 52 52
4 9 53 53
2 9 54 54
5 10 55 55
3 10 56 56
1 10 57 57
6 10 58 58
4 10 59 59
2 10 60 60
5 11 61 61
3 11 62 62
1 11 63 63
6 11 64 64
4 11 65 65
2 11 66 66
5 12 67 67
3 12 68 68
1 12 69 69
6 12 70 70
4 12 71 71
2 12 72 72
5 13 73 73
3 13 74 74
1 13 75 75
6 13 76 76
4 13 77 77
2 13 78 78
5 14 79 79
3 14 80 80
1 14 81 81
6 14 82 82
4 14 83 83
2 14 84 84
5 15 85 85
3 15 86 86
1 15 87 87
6 15 88 88
4 15 89 89
2 15 90 90
5 16 91 91
3 16 92 92
1 16 93 93
6 16 94 94
4 16 95 95
2 16 96 96

Measurements with source

4/20/12 1hour counts:

SL2 HVB1 Column 18 Row 5

-With source 14459 pulses/1502 sec


4/23/12 SL1 HVB7 column 203 row 4

-With source 50681 pulses/3760 sec.


4/25/12 1 hour counts:

SL2 HVB4 Column 118 row 5

- Without source: 33145 pulses/3610 Sec.

- With source(CS-137):38262 pulses/3600 Sec.

- Without source: 37548 pulses/3715 Sec.

Preamp voltage:5V

Background measurements

HV off 4/5/12 Background counts:

27 pulses/61806 Sec.

SL2 Column 132 row 2

Preamp voltage 6.3V

Discriminator threshold 46mV


Preamp on= 6.3

4/9/12: Back ground count measurements

4531 counts/69564 seconds

2044 counts/24620 seconds


4/10/12 Background counts:

3 pulses/ 74500 sec.

SL1 HVB7 Column 196 Row 2

Preamp voltage 6.3 V

Discriminator threshold 46mV


4/16/12 Background counts:

280 pulses/245850 sec

SL1 HVB7 column 226 row 2

preamp voltage 5V

Discriminator threshold 46mV


4/17/12 Background counts:

6 pulses/62407 sec

SL2 HVB7 column 226 row 8

preamp voltage 5V

discriminator threshold 46mV


4/20/12 Background counts:

63 pulses/ 71724 Sec.

SL1 HVB7 column 226 row 8

Preamp voltage 5V

Discriminator threshold 46mV


4/23/12 Background counts:

41078 pulse/ 245104 sec.

SL1 HVB7 Column 203 Row 4

Preamp voltage 5V

Discriminator threshold 46mV

Cosmic measurements

4/24/12 Cosmic count:

SL1 HVB1 Column 3 Row 10

14534 pulses/11547 sec.

Preamp voltage 5V


4/26/12 Overnight Cosmic pulse count:

SL2 HVB4 Column 118 Row 5

53122 pulses/49793 Sec.

Preamp voltage 5V



CLAS12_R1

Retrieved from "https://wiki.iac.isu.edu/index.php?title=CLAS12_R1_S1_QA&oldid=83269"