Difference between revisions of "August 24, 2007 - Cosmic Telescope"

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This is the data explained on the page of August 23.
 
This is the data explained on the page of August 23.
  
The three points with 175 mV, 200 mV, and 300 mV on both were taken just to reassure the tendencies of the scintilltors at different thresholds.
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The three points with 175 mV, 200 mV, and 300 mV on both were taken just to reassure the tendencies of the scintillators at different thresholds.
  
  
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[[Image:Threshold Zeroing]]
 
[[Image:Threshold Zeroing]]
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After all these experiments, the scintillators will be set at a High Voltage of 1250 Volts and with a Threshold of 225 mV.  Longer term measurements are now commencing.  With these voltages and thresholds, a measurement was started at 5:13 pm on 8-24 with the telescope vertical (0 degrees).  Tomorrow the measurement will stop and we will set the thresholds at 250 just to make sure that the range is still working.  That will run until monday.  All the data will be put on the page for Monday the 27th.

Latest revision as of 00:18, 25 August 2007

This is the data explained on the page of August 23.

The three points with 175 mV, 200 mV, and 300 mV on both were taken just to reassure the tendencies of the scintillators at different thresholds.


Plateau Zeroing
Time Threshold on top scint. Threshold on bottom scint. Singles Count (on top) Coinc. Counts Coinc. per minute
30 min 225 225 2108 77 2.57
30 min 250 225 1874 74 2.47
30 min 275 225 1656 78 2.6
30 min 225 250 2697 83 2.77
30 min 250 250 2333 85 2.83
30 min 275 250 1848 82 2.73
30 min 225 275 2606 56 1.87
30 min 250 275 2022 47 1.57
30 min 275 275 1768 76 2.53
30 min 175 175 3787 94 3.13
30 min 200 200 2675 69 2.3
30 min 300 300 1580 57 1.9

This is a graph of the three main sets of points.

File:Threshold Zeroing


After all these experiments, the scintillators will be set at a High Voltage of 1250 Volts and with a Threshold of 225 mV. Longer term measurements are now commencing. With these voltages and thresholds, a measurement was started at 5:13 pm on 8-24 with the telescope vertical (0 degrees). Tomorrow the measurement will stop and we will set the thresholds at 250 just to make sure that the range is still working. That will run until monday. All the data will be put on the page for Monday the 27th.