Difference between revisions of "August 15, 2007 - Cosmic Telescope"

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Since we have now mapped out the Bases and their opperating ranges, we will proceed to find the best High Voltage opperating ranges of the Scintillators.  We have set the Thresholds at 275 mV each and they wer set at a distance of 2cm apart.  The Top Scintillator is connected to Base 1 and the bottom scintillator is connected to base 2.  We began by setting both scintillators at a High Voltage of 1300 and measuring the counts.  After this was done, one scintillator was set at a voltage of 1300 and the other's voltage was changed at increments of 50 down to 1100 and up to 1450.  This opperation was performed for both scintillators.
 
{| border="1" cellpadding="20" cellspacing="0"
 
{| border="1" cellpadding="20" cellspacing="0"
−
! colspan="2"|Plateau of Scintillators
+
! colspan="2"|Plateau of Top Scintillator
 
|-
 
|-
 
|Time
 
|Time
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|Singles Count (on top)
 
|Singles Count (on top)
 
|Coinc. Counts
 
|Coinc. Counts
 +
|Coinc. per minute
 +
|-
 +
|30 min
 +
|1450
 +
|1300
 +
|2963
 +
|74
 +
|2.47
 +
|-
 +
|30 min
 +
|1400
 +
|1300
 +
|3029
 +
|100
 +
|3.33
 +
|-
 +
|30 min
 +
|1350
 +
|1300
 +
|3106
 +
|76
 +
|2.53
 
|-
 
|-
 
|90 min
 
|90 min
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|7265
 
|7265
 
|233
 
|233
 +
|2.59
 
|-
 
|-
 
|30 min
 
|30 min
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|2462
 
|2462
 
|87
 
|87
 +
|2.33
 
|-
 
|-
 
|30 min
 
|30 min
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|1817
 
|1817
 
|70
 
|70
 +
|2.3
 
|-
 
|-
 +
|30 min
 
|1200
 
|1200
 
|1300
 
|1300
 
|1129
 
|1129
 
|69
 
|69
 +
|2.37
 
|-
 
|-
 
|30 min
 
|30 min
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|535
 
|535
 
|71
 
|71
 +
|2.37
 +
|-
 +
|30 min
 +
|1100
 +
|1300
 +
|174
 +
|21
 +
|0.07
 +
|}
 +
 +
{| border="1" cellpadding="20" cellspacing="0"
 +
! colspan="2"|Plateau of Bottom Scintillator
 +
|-
 +
|Time
 +
|HV on top scint.
 +
|HV on bottom scint.
 +
|Singles Count (on top)
 +
|Coinc. Counts
 +
|Coinc. per minute
 +
|-
 +
|30 min
 +
|1300
 +
|1450
 +
|3059
 +
|112
 +
|3.73
 
|-
 
|-
 
|30 min
 
|30 min
−
|110
 
 
|1300
 
|1300
 +
|1400
 +
|3185
 +
|107
 +
|3.57
 +
|-
 +
|30 min
 +
|1300
 +
|1350
 +
|3009
 +
|74
 +
|2.47
 +
|-
 +
|30 min
 +
|1300
 +
|1300
 +
|2462
 +
|87
 +
|2.77
 +
|-
 +
|90 min
 +
|1300
 +
|1250
 +
|1817
 +
|70
 +
|2.36
 +
|-
 +
|30 min
 +
|1300
 +
|1200
 +
|1129
 +
|69
 +
|1.23
 +
|-
 +
|30 min
 +
|1300
 +
|1150
 +
|535
 +
|71
 +
|0.267
 +
|-
 +
|90 min
 +
|1300
 +
|1100
 
|174
 
|174
−
|21  
+
|21
 +
|0.0667
 
|}
 
|}
 +
 +
[[Image:Cosmic Coincidence Rates.jpg]]
 +
 +
[[Image:Plateau of Scintillators.jpg]]

Latest revision as of 19:55, 23 August 2007

Since we have now mapped out the Bases and their opperating ranges, we will proceed to find the best High Voltage opperating ranges of the Scintillators. We have set the Thresholds at 275 mV each and they wer set at a distance of 2cm apart. The Top Scintillator is connected to Base 1 and the bottom scintillator is connected to base 2. We began by setting both scintillators at a High Voltage of 1300 and measuring the counts. After this was done, one scintillator was set at a voltage of 1300 and the other's voltage was changed at increments of 50 down to 1100 and up to 1450. This opperation was performed for both scintillators.

Plateau of Top Scintillator
Time HV on top scint. HV on bottom scint. Singles Count (on top) Coinc. Counts Coinc. per minute
30 min 1450 1300 2963 74 2.47
30 min 1400 1300 3029 100 3.33
30 min 1350 1300 3106 76 2.53
90 min 1300 1300 7265 233 2.59
30 min 1300 1300 2462 87 2.33
30 min 1250 1300 1817 70 2.3
30 min 1200 1300 1129 69 2.37
30 min 1150 1300 535 71 2.37
30 min 1100 1300 174 21 0.07
Plateau of Bottom Scintillator
Time HV on top scint. HV on bottom scint. Singles Count (on top) Coinc. Counts Coinc. per minute
30 min 1300 1450 3059 112 3.73
30 min 1300 1400 3185 107 3.57
30 min 1300 1350 3009 74 2.47
30 min 1300 1300 2462 87 2.77
90 min 1300 1250 1817 70 2.36
30 min 1300 1200 1129 69 1.23
30 min 1300 1150 535 71 0.267
90 min 1300 1100 174 21 0.0667

Cosmic Coincidence Rates.jpg

Plateau of Scintillators.jpg

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