# Difference between revisions of "GEM and Sci. data and measuurements"

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# Counting Experiemnt using tennelec tc 534

All the counting was done by one scale tennelec tc 534.

## Discriminator setup for GEM and PMT's

The counting period is 5 min for all the discriminator threshold measurements unless it is differently reported for a specific measurement.

GEM (amplified 15) without source

 Voltage (V) Number of Counts (5min) Average ( /min) 3.0 9 , 16, 26, 32, 46 8.5 0.5 2.5 62, 138, 208, 267, 329 66.7 3 2.0 259, 618 (2.5min), 767, 1001, 1241 253 5 1.9 1030, 2100, 3200, 4300, 5391 1002 110 1.8 20667 20667

GEM (amplified 15) with source

 Voltage (V) Number of Counts (5min) Average ( /min) 2.5 14,23,43,68,77 3 2.0 116,248,391,513,640 3 1.8 1674, 3350, 5037, 6680,8385 1.7 22200 1.6 57000 1.5 349000
GEM (amplified 15) without source ortec 875
 Voltage (V) Number of Counts (5min) Average ( /min) 2.5 14,23,43,68,77 3 2.0 115,262,390,508,646 3 1.8 3650, 7650, 11350, 14550,17938 1.7 22200 1.6 57000 1.5 349000
PMT (R)

 Voltage (V) Number of Counts (5min) Average (/min.) 1.00 87, 178, 254, 337, 430 86 2 0.7 219,410, 585, 768, 977 203 12 0.35 441, 941 (2.1min.), 1383, 1853, 2354 453 11 0.30 750(1.5min), 1012, 1551, 2050, 2573 509 8

PMT (L) (amplified)

 Voltage (V) Number of Counts (5min) 2.0 56, 110, 171, 234, 290 572 1.0 263, 484, 737, 978, 1233 248 10 0.6 497, 1055,1632, 2114, 2655 52420 0.25 945,1866,2787, 3676,4643 93211

## 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 1.4 overnight 05/09/14 06:26:00 05/09/14 13:54:00 1187 99300 1.4 Daylight 05/09/14 13:54:00 05/09/14 21:18:00 1631 136290 1.4 Daylight 05/09/14 21:18:00 05/11/14 6:55 3648 301960 1.4

## Counting GEM (2.7, 3.1kV)

GEM operating voltage is 2.7, 3.1V GEM and cathode successively, and the disc. threshold is 2.0 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) 42903 311 2.3 Daylight 05/09/14 23:37:00 05/09/14 06:18:00(731) 99196 712 2.3 overnight 05/09/14 06:18:00 05/09/14 13:50:00(1183) 162485 1164 2.3 Daylight 05/09/14 13:50:00 05/09/14 21:21:00(1633) 223301 1614 2.3 Daylight 05/09/14 21:21:00 05/11/14 06:57:00(3650) 472100 3631 2.2 weekend

## Counting without a source (Background)

GEM and Sci. are in coincidence, GEM detector operating voltage is 2.7, 3.1V for GEM and cathode successively, both of the PMT's have 1kV input voltage.

The disc. setup is as determined in the previous measurements, the count rate is 0.001 /min for scintillator-GEM coincidence

# Counting Experiemnt using 3 scales including tennelec tc 534

## GEM Counts

Without Source
 Counting Time (min.) Number of Counts Count rate (cout./min.) Notes 15 882 59

With Source
 Counting Time (min.) Number of Counts Count rate (cout./min) Notes 120 7390 60 using the new counter ortec sophiia has only 1 cout/s 120 16565 138 change to the same counter used before for GEM ortec 875 without 2.3 count/s 433 37865 87 1.4 count/s, overnight 230 29618 1.29 2.1 count/s

increasing the voltage to 2.85 kV, and 3.45 kV

without source coicidence of the three is 25 when it counted for 283 min.

with a soruce 300 counts in 970 min. ,we may need to increase the voltage again.

# Coincidence Scope pictures

## First Coincidence using Widest timing gate (1 usec)

Source ON

I saw about 1 coincidence perr minute with the source

Coincidence rate with soure off