CLAS12 R1 S1 QA

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

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)

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

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	U37	L1W7
40	U37	L3W7
41	U37	L5W7
42	U38	L2W8
43	U39	L4W8
44	U40	L6W8
45	U41	L1W8
46	U42	L3W8
47	U43	L5W8

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