October 22, 2008

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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


The root commands

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");

Will create histogram with 800 channels and 800 bins so we have 1 bin per channel (ns).

Run229RefDet.gif Run229DetAup.gif Run229DetCside.gif


To normalize the data you need to integrate the NaI histogram. To do this a skeleton program is creates using ROOT which will loop through the ROOT ntuple using the command

PhotoFis->MackClass();

You will see a file called PhotoFis.C after you execute the above command within the ROOT interpreter window.


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Run 234

NaI spectrum monitoring the photon flux during run 234

Run234RefDet.gif Run234DetAside.gif Run234DetCup.gif Run234RefDetNorm.gif Run234DetAsideNorm.gif Run234DetCupNorm.gif

Asym

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