Difference between revisions of "Cf252 NaI detector test. 12 Apr 2012"

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[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back]
 
  
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==041212==
 
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*NaI detector,
 
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* 300 mV threshold on gate channel
 
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* signal ADC4
 
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*-1030V at the beginning
 
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*-1055V at the end of run
 
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{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
 
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! scope="col" width="8%" | Run #
 
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! scope="col" width="15%" | source
 
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! scope="col" width="15%" | shielding
 
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! scope="col" width="8%" | cnts
 
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! scope="col" width="8%" | rate
 
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! scope="col" width="66%" | Comments
 
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|2775||Co-60 away from NaI  ||2" Pb around, no front shielding ||133,884 || ||
 
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|2776||bkgd                  ||2" Pb around, no front shielding ||7,289  || ||
 
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|2777||Co-60 infront of NaI  ||2" Pb around, no front shielding ||313,427 || 
 
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|align="left"|1.2 and 1.4 MeV peaks, small peak around 4.3 MeV
 
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Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl
 
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|2778||bkgd||2" Pb around, no front  ||15,822    ||41.75 Hz ||
 
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|2779||bkgd||all around 2" Pb around ||8,566    ||15.74 Hz ||align="left"|good area around 2000-3800 channels
 
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|2780||Cf252||all around 2" Pb around||          ||12 kHz ||align="left"|Cf252 just in front of NaI
 
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|2781||Cf252||all around 2" Pb around||          ||5.4 kHz ||align="left"|Cf252 about 15 cm away from NaI
 
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|2782||Cf252||all around 2" Pb around||607,790  ||1.1 kHz ||align="left"|Cf252 17" away from NaI
 
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|2784||Cf252||all around 2" Pb around||1,372,745 ||1,142 Hz ||align="left"|20 min run. No shielding in front
 
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|2785||Cf252||all around 2" Pb around||153,508  ||129.5 Hz ||align="left"|20 min run. 2" Pb just after Cf252
 
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|2787||Cf252||all around 2" Pb around||1,231,537 ||1,024 Hz ||align="left"|20 min run. 2" Borated Poly just after Cf252
 
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|2788||Cf252||all around 2" Pb around||1,225,232 ||1,020 Hz ||align="left"|20 min run. 2" Unborated Poly just after Cf252
 
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|2790||Cf252||all around 2" Pb around||132,067  ||111.6 Hz ||align="left"|20 min run. 2" Pb, 2" Borated Poly just after Cf252
 
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|2791||Cf252||all around 2" Pb around||108,603  ||89.6 Hz ||align="left"|20 min run. 4" Pb just after Cf252
 
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|2792||bkgd ||all around 2" Pb around||45,904    ||25.04 Hz ||align="left"|20 min run. background checking
 
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|}
 
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* rise time of NaI 50 ns
 
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* decay time of NaI 3 us
 
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*run 2784: Cf252 no shielding infront. 1,372,745 events
 
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[[File:Cf no shielding infront.png | 700px]]
 
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*run 2787: Cf252 2" Borated Poly infront. 1,231,537 events
 
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[[File:Cf 2inchBoratedPoly infront.png | 700px]]
 
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*run 2788: Cf252 2" Unborated Poly infront. 1,225,232 events
 
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[[File:Cf 2inchUnBoratedPoly infront.png | 700px]]
 
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*run 2792: background checking. 45,904 events
 
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[[File:Background.png | 700px]]
 
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*run 2785: Cf252 2" Pb infront. 153,508 events
 
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[[File:Cf 2inchPb shlng infront.png | 700px]]
 
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*run 2790: Cf252 2" Pb + 2" Borated Poly infront. 132,067 events
 
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[[File:Cf 2inchBoratedPoly 2inchPb.png | 700px]]
 
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*run 2791: Cf252 4" Pb infront. 108,603 events
 
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[[File:Cf 4inchPb shlng infront.png | 700px]]
 
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==041312==
 
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*NaI detector,
 
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* 300 mV threshold on gate channel
 
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* signal ADC4
 
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*-1036V switched to modern power supply
 
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{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
 
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! scope="col" width="8%"  | Run #
 
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! scope="col" width="8%"  | source
 
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! scope="col" width="8%"  | cnts
 
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! scope="col" width="8%"  | rate
 
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! scope="col" width="68%" | Comments
 
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|2793||bkg  ||      ||     
 
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|align="left"|shielding: detector -> 2" Pb around -> 2" Poly around
 
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V = -1014 V
 
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|2794||Cf252 ||      ||1.24 Hz     
 
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|align="left"|new power supply N471 CAEN, -1035V
 
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Cf252 17 inch away from detector, DAQ crashed<br>
 
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shielding: Al around the NaI -> borated shielding (not infront)
 
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|2795||Cf252 ||55,458  ||88.23 Hz     
 
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|align="left"|4" Pb infront of Cf252 + Al around and inside the shilding
 
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10 min
 
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|2796||Cf252 ||130,122 ||79.23 Hz     
 
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|align="left"|27 min, looking for (n,gamma) capture effect, 10B: 4.44 MeV (100%)
 
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geometry: Cf252 -> 5" Pb -> bored Poly (small brick) -> 2" Al  ----> NaI
 
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|2797||Cf252 ||80,763  ||81.79 Hz     
 
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|align="left"|geometry: Cf252 -> 5" Pb -> bored Poly (whole) -> 2" Al  ----> NaI
 
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|2798||Cf252 ||134,725 ||95.38 Hz     
 
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|align="left"|geometry: no Boron but Al is still in
 
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23 min
 
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|2799||bkg  ||21,6941  ||37.86 Hz     
 
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|align="left"|background 108 min run
 
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detector -> 2" Pb around (except on the top of detector was 2" Al) -> 2" Poly around
 
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|2800||bkg  ||71,080  ||12.5 Hz     
 
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|align="left"|background 94 min run
 
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detector -> 2" Pb around -> 2" Poly around, 4" Poly on top, no Al inside
 
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[[File:Bkg.png |500px]]
 
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[[File:Cf252 Al aroundandIn.png |500px]]
 
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[[File:Cf252 4inPb Al aroundandIn.png |500px]]
 
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[[File:Cf252 5inPb Al aroundandIn smallBin.png |500px]]
 
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[[File:Cf252 5inPb Al aroundandIn wholeBin.png |500px]]
 
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[[File:Cf252 5inPb Al aroundandIn noBin.png |500px]]
 
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*run 2799, 2800
 
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[[File:Background run.png |500px]]
 
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[[File:Background run improved shldg.png |500px]]
 

Latest revision as of 16:01, 17 April 2012

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