Difference between revisions of "10-31-08 GEM HRRL Photon Runs"

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Now turn the detector on with the beam current on and I see a peak around 150 channels again.
 
Now turn the detector on with the beam current on and I see a peak around 150 channels again.
  
5 minutes long
+
3 minutes long
 +
 
 
=Run 5=
 
=Run 5=
  

Revision as of 22:13, 31 October 2008

The Goal today is to observe position dependence of photons on the GEM detector


A1 -> 13 A2 -> 11 A3 -> Trig A4 -> 2 A6 -> 16 A7 -> 8 A8 -> 5 A9 -> NaI -> B9


B1 -> ADC1A


Run 0

GEM Backgrnd.mpa

GEM HV : VDrif = 3850, VGem = 3550

HRRL : E = 14 MeV, I =0

5 minutes long

Run 1

Run1.mpa

GEM HV : VDrif = 3850, VGem = 3550

HRRL : E = 14 MeV, I =20mA


ADC 1D has clear second peak at channel 150 but ADC1 does not. Lets Observe ADC 1D as a function of position. This corresponds to GEM output strip 13.

5 minutes long

Run 2

Run2.mpa

GEM HV : VDrif = 3550, VGem = 3550

HRRL : E = 14 MeV, I =20mA

5 minutes long


I see a second peak on ADC1D but it is at channels 100 and not 150.

Run 3

Run3.mpa

GEM HV : VDrif = 3550, VGem = 3550

HRRL : E = 14 MeV, I =20mA

3 minutes long

Unplug NaI and peak resumes near 150 channels

Run 4

Run4.mpa

GEM HV : VDrif = 3850, VGem = 3550

HRRL : E = 14 MeV, I =20mA


Now turn the detector on with the beam current on and I see a peak around 150 channels again.

3 minutes long

Run 5

Run5.mpa

GEM HV : VDrif = 3850, VGem = 3550

HRRL : E = 14 MeV, I =20mA


Now move the detector away from the photons.

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