Difference between revisions of "10-30-08 GEM HRRL Photon Runs"

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The Goal today is to observe the GEM detector output when hit with MeV photons
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=14 MeV photons=
 
=14 MeV photons=
  
 
We are sending 14 MeV phtoton through a 4" thick brick wall collimator.  A 4" Al brick in front of the HRRL exit port is used as a FC.   
 
We are sending 14 MeV phtoton through a 4" thick brick wall collimator.  A 4" Al brick in front of the HRRL exit port is used as a FC.   
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FC: 223B2
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NaI: 223B5
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Acc Gate: 223B8
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GEMtrig: 223B3
  
 
Vdrift= 3700 Volt
 
Vdrift= 3700 Volt
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VGem=3400
 
VGem=3400
 
IGem=815 microA
 
IGem=815 microA
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The scope trace below shows output when electron beam current is  9 mA.
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[[Image:10-30-08_14MeV9mAHRRL_GEM_strip8.png | 200 px]]
  
 
The scope trace below shows output when electron beam current is  18 mA.
 
The scope trace below shows output when electron beam current is  18 mA.
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[[Image:10-30-08_14MeV36mAHRRL_GEM_strip8.png | 200 px]]
 
[[Image:10-30-08_14MeV36mAHRRL_GEM_strip8.png | 200 px]]
  
The scope trace below shows output when electron beam current is  9 mA.
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The scope trace below shows output when electron beam current is  55 mA.
  
[[Image:10-30-08_14MeV9mAHRRL_GEM_strip8.png | 200 px]]
+
[[Image:10-30-08_14MeV55mAHRRL_GEM_strip8.png | 200 px]]
  
  
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[[Image:10-30-08_14MeV9mAHRRL_GEM_strip8_Vd3800.png | 200 px]]
 
[[Image:10-30-08_14MeV9mAHRRL_GEM_strip8_Vd3800.png | 200 px]]
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 +
The scope trace below shows output when electron beam current is  4 mA.
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 +
[[Image:10-30-08_14MeV4mAHRRL_GEM_strip8_Vd3800.png | 200 px]]
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=10 MeV photons=
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The scope trace below shows output when electron beam current is  20 mA.
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 +
[[Image:10-30-08_10MeV20mAHRRL_GEM_strip8_Vd3800.png | 200 px]]
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 +
Peak amplitude is same but rate is much lower

Latest revision as of 23:04, 30 October 2008

The Goal today is to observe the GEM detector output when hit with MeV photons

14 MeV photons

We are sending 14 MeV phtoton through a 4" thick brick wall collimator. A 4" Al brick in front of the HRRL exit port is used as a FC.


FC: 223B2 NaI: 223B5 Acc Gate: 223B8 GEMtrig: 223B3

Vdrift= 3700 Volt

VGem=3400 IGem=815 microA


The scope trace below shows output when electron beam current is 9 mA.

10-30-08 14MeV9mAHRRL GEM strip8.png

The scope trace below shows output when electron beam current is 18 mA.

10-30-08 18mAHRRL GEM strip8.png

The scope trace below shows output when electron beam current is 36 mA.

10-30-08 14MeV36mAHRRL GEM strip8.png

The scope trace below shows output when electron beam current is 55 mA.

10-30-08 14MeV55mAHRRL GEM strip8.png


Now Max Gain on GEM

Vdrift= 3800 Volt

VGem=3500 IGem=841 microA

The scope trace below shows output when electron beam current is 9 mA.

10-30-08 14MeV9mAHRRL GEM strip8 Vd3800.png

The scope trace below shows output when electron beam current is 4 mA.

10-30-08 14MeV4mAHRRL GEM strip8 Vd3800.png

10 MeV photons

The scope trace below shows output when electron beam current is 20 mA.

10-30-08 10MeV20mAHRRL GEM strip8 Vd3800.png

Peak amplitude is same but rate is much lower