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)
0.3 9 , 16, 26, 32, 46
0.25 62, 138, 208, 267, 329
0.20 259, 618 (2.5min), 767, 1001, 1241
0.19 1030, 2100, 3200, 4300, 5391
0.18 20667


PMT (R)


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)


1.0
0.9
0.6 497, 1055,1632, 2114, 2655
0.25 945,1866,2787, 3676,4643

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 (cout./s) Count Rate 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