Difference between revisions of "October 22, 2008"

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[[Image:Run234_Nai_Spectrum.gif|300px|thumb|NaI spectrum monitoring the photon flux during run 234]]
 
[[Image:Run234_Nai_Spectrum.gif|300px|thumb|NaI spectrum monitoring the photon flux during run 234]]
  
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==Asym==
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http://www.iac.isu.edu/mediawiki/index.php/October_Fission_HRRL_Measurements_2008 go back
 
http://www.iac.isu.edu/mediawiki/index.php/October_Fission_HRRL_Measurements_2008 go back

Revision as of 19:08, 23 October 2008

Unpolarized Measurents:

A 2x4x8" aluminum brick was placed at the HRRL export in order to destroy the photon polarization. Rate measurements were made with the descriminator and HV settings used the past week. Then the constant fraction descriminator was replaced with a threshold descriminator on two detectors but not the reference detector.

ADC =0 => Reference Detector D

ADC = 1 => NaI

ADC=2 => Detector C

ADC = 3 => Detector A

channel # * 0.1675 ns/chan => ns

Root command to create and manipulate histograms

root [24] TH1F *RefDetRun229=new TH1F("RefDetRun229","RefDetRun229",800,0,800); root [25] PhotoFis->Draw("evt.ADCval*0.1675 >> RefDetRun229","evt.ADCnum==0 && evt.LastADCval>0");


Default HV and CF descriminator

Matched HV and Threshold Descriminator

2 Runs were taken with the following settings

100 ms Threshold descrimnaotr

[math]HV_{Det A}[/math] =

[math]HV_{Det_C}[/math] =

Run 229

NaI spectrum monitoring the photon flux during run 229

Run229RefDet.gif Run229DetAup.gif Run229DetCside.gif 300 px 300 px 300 px



Run 234

NaI spectrum monitoring the photon flux during run 234

Run229RefDet.gif 300 px 300 px 300 px 300 px 300 px

Asym

300 px 300 px 300 px 300 px 300 px 300 px


http://www.iac.isu.edu/mediawiki/index.php/October_Fission_HRRL_Measurements_2008 go back