GEM and Sci. data and measuurements

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Counting Experiemnt

Discriminator setup for GEM and PMT's

The time period for counting 1 min.

GEM (amplified 15)


Voltage (V) Number of Counts (5min)
3.0 9 , 16, 26, 32, 46
2.5 62, 138, 208, 267, 329
2.0 259, 618 (2.5min), 767, 1001, 1241
1.9 1030, 2100, 3200, 4300, 5391
1.8 20667


PMT (R)


Voltage (V) Number of Counts (5min)
1.00 87, 178, 254, 337, 430
0.7 219,410, 585, 768, 977
0.35 441, 941 (2.1min.), 1383, 1853, 2354
0.30 750(1.5min), 1012, 1551, 2050, 2573


PMT (L) (amplified)


Voltage (V) Number of Counts (5min)
2.0 56, 110, 171, 234, 290
1.0 263, 484, 737, 978, 1233
0.6 497, 1055,1632, 2114, 2655
0.25 945,1866,2787, 3676,4643

Counting the coincidence for the PMT's

The discriminator setup is 0.7 and 1.0 V for the Left and the right PMT successively.

Without Source
Start Date Time End Date Time Duration (min.) Number of Counts Count rate (cout./s) Notes
05/08/14 17:55 05/08/14 11:32:00 325 27120 1,4 Daylight
05/08/14 11:32:00 05/09/14 06:26:00 739 61825 overnight
05/09/14 06:26:00 05/09/14 13:54:00 1187 99300 Daylight
05/09/14 13:54:00 05/09/14 21:18:00 1631 136290 Daylight
05/09/14 21:18:00 05/11/14 6:55 3648 301960 Daylight

Counting GEM

disc. 2.5 V

Without source


Start Date Time End Date Time Number of Counts Duration (min.) Count Rate (cout./s) Notes
05/08/14 16:14:19 05/08/14 23:37:00 (311 from 330 less by 19) 429031 311 23 Daylight
05/09/14 23:37:00 05/09/14 06:18:00(731) 99196 overnight
05/09/14 06:18:00 05/09/14 13:50:00(1183) 162485 Daylight
05/09/14 13:50:00 05/09/14 21:21:00(1633) 223301 Daylight
05/09/14 21:21:00 05/11/14 06:57:00(3650) 472100 Daylight

Counting without a source (Background)

GEM and Sci. in coincidence (and gate), GEM oprating voltage is 2.7, 3.1V GEM and cathode successively, both of the PMT's has 1kV input voltage.


Start Date Time End Date Time Duration (min.) Number of Counts Count Rate (cout./s) Notes
05/07/14 10:30 05/08/14 06:47 500 19392 0.65 Overnight
05/08/14 06:50 05/08/14 13:14 385 14540 0.63 Daylight