Shaproma: Created page with '[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back] ==041212== NaI detector, 300 mV threshold on gate channel * signal ADC4 *-1030V …'

2012-04-17T16:01:11Z

Created page with '[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back] ==041212== *NaI detector, * 300 mV threshold on gate channel * signal ADC4 *-1030V …'

New page

[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back]

==041212==

*NaI detector,
* 300 mV threshold on gate channel
* signal ADC4
*-1030V at the beginning
*-1055V at the end of run

{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
! scope="col" width="8%" | Run #
! scope="col" width="15%" | source
! scope="col" width="15%" | shielding
! scope="col" width="8%" | cnts
! scope="col" width="8%" | rate
! scope="col" width="66%" | Comments
|-
|2775||Co-60 away from NaI ||2" Pb around, no front shielding ||133,884 || ||
|-
|2776||bkgd ||2" Pb around, no front shielding ||7,289 || ||
|-
|2777||Co-60 infront of NaI ||2" Pb around, no front shielding ||313,427 ||
|align="left"|1.2 and 1.4 MeV peaks, small peak around 4.3 MeV
Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl
|-
|2778||bkgd||2" Pb around, no front ||15,822 ||41.75 Hz ||
|-
|2779||bkgd||all around 2" Pb around ||8,566 ||15.74 Hz ||align="left"|good area around 2000-3800 channels
|-
|2780||Cf252||all around 2" Pb around|| ||12 kHz ||align="left"|Cf252 just in front of NaI
|-
|2781||Cf252||all around 2" Pb around|| ||5.4 kHz ||align="left"|Cf252 about 15 cm away from NaI
|-
|2782||Cf252||all around 2" Pb around||607,790 ||1.1 kHz ||align="left"|Cf252 17" away from NaI
|-
|2784||Cf252||all around 2" Pb around||1,372,745 ||1,142 Hz ||align="left"|20 min run. No shielding in front
|-
|2785||Cf252||all around 2" Pb around||153,508 ||129.5 Hz ||align="left"|20 min run. 2" Pb just after Cf252
|-
|2787||Cf252||all around 2" Pb around||1,231,537 ||1,024 Hz ||align="left"|20 min run. 2" Borated Poly just after Cf252
|-
|2788||Cf252||all around 2" Pb around||1,225,232 ||1,020 Hz ||align="left"|20 min run. 2" Unborated Poly just after Cf252
|-
|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
|-
|2791||Cf252||all around 2" Pb around||108,603 ||89.6 Hz ||align="left"|20 min run. 4" Pb just after Cf252
|-
|2792||bkgd ||all around 2" Pb around||45,904 ||25.04 Hz ||align="left"|20 min run. background checking

|}

* rise time of NaI 50 ns
* decay time of NaI 3 us

*run 2784: Cf252 no shielding infront. 1,372,745 events
[[File:Cf no shielding infront.png | 700px]]

*run 2787: Cf252 2" Borated Poly infront. 1,231,537 events
[[File:Cf 2inchBoratedPoly infront.png | 700px]]

*run 2788: Cf252 2" Unborated Poly infront. 1,225,232 events
[[File:Cf 2inchUnBoratedPoly infront.png | 700px]]

*run 2792: background checking. 45,904 events
[[File:Background.png | 700px]]

*run 2785: Cf252 2" Pb infront. 153,508 events
[[File:Cf 2inchPb shlng infront.png | 700px]]

*run 2790: Cf252 2" Pb + 2" Borated Poly infront. 132,067 events
[[File:Cf 2inchBoratedPoly 2inchPb.png | 700px]]

*run 2791: Cf252 4" Pb infront. 108,603 events
[[File:Cf 4inchPb shlng infront.png | 700px]]

==041312==

*NaI detector,
* 300 mV threshold on gate channel
* signal ADC4
*-1036V switched to modern power supply

{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
! scope="col" width="8%" | Run #
! scope="col" width="8%" | source
! scope="col" width="8%" | cnts
! scope="col" width="8%" | rate
! scope="col" width="68%" | Comments
|-
|2793||bkg || ||
|align="left"|shielding: detector -> 2" Pb around -> 2" Poly around
V = -1014 V
|-
|2794||Cf252 || ||1.24 Hz
|align="left"|new power supply N471 CAEN, -1035V
Cf252 17 inch away from detector, DAQ crashed<br>
shielding: Al around the NaI -> borated shielding (not infront)

|-
|2795||Cf252 ||55,458 ||88.23 Hz
|align="left"|4" Pb infront of Cf252 + Al around and inside the shilding
10 min
|-
|2796||Cf252 ||130,122 ||79.23 Hz
|align="left"|27 min, looking for (n,gamma) capture effect, 10B: 4.44 MeV (100%)
geometry: Cf252 -> 5" Pb -> bored Poly (small brick) -> 2" Al ----> NaI
|-
|2797||Cf252 ||80,763 ||81.79 Hz
|align="left"|geometry: Cf252 -> 5" Pb -> bored Poly (whole) -> 2" Al ----> NaI
|-
|2798||Cf252 ||134,725 ||95.38 Hz
|align="left"|geometry: no Boron but Al is still in
23 min
|-
|2799||bkg ||21,6941 ||37.86 Hz
|align="left"|background 108 min run
detector -> 2" Pb around (except on the top of detector was 2" Al) -> 2" Poly around
|-
|2800||bkg ||71,080 ||12.5 Hz
|align="left"|background 94 min run
detector -> 2" Pb around -> 2" Poly around, 4" Poly on top, no Al inside
|-
|}

[[File:Bkg.png |500px]]
[[File:Cf252 Al aroundandIn.png |500px]]

[[File:Cf252 4inPb Al aroundandIn.png |500px]]
[[File:Cf252 5inPb Al aroundandIn smallBin.png |500px]]

[[File:Cf252 5inPb Al aroundandIn wholeBin.png |500px]]
[[File:Cf252 5inPb Al aroundandIn noBin.png |500px]]

*run 2799, 2800
[[File:Background run.png |500px]]
[[File:Background run improved shldg.png |500px]]

Cf252 NaI detector test. Apr 2012 - Revision history

Shaproma: Created page with '[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back] ==041212== *NaI detector, * 300 mV threshold on gate channel * signal ADC4 *-1030V …'

Shaproma: Created page with '[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back] ==041212== NaI detector, 300 mV threshold on gate channel * signal ADC4 *-1030V …'