Photoelectron Track Length Distributions Measured in a Negative Ion Time Projection Chamber

Z.R. Prieskorn,J.E. Hill,P.E. Kaaret,J.K. Black

Nuclear Science, IEEE Transactions （2014）

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摘要

We report photoelectron track length distributions between 3 and 8 keV in gas mixtures of Ne + CO2 + CH3NO2 (260:80:10 Torr) and CO2 + CH3NO2 (197.5: 15 Torr). The measurements were made using a negative ion time projection chamber (NITPC) at the National Synchrotron Light Source (NSLS) at the Brookhaven National Laboratory (BNL). We report the first quantitative analysis of photoelectron track length distributions in a gas. The distribution of track lengths at a given energy is best fit by a lognormal distribution. A powerlaw distribution of the form, f(E) = a(E/Eo)n, is found to fit the relationship between mean track length and energy. We find n = 1.29±0.07 for Ne + CO2 + CH3NO2 and n = 1.20±0.09 for CO2 + CH3NO2. Understanding the distribution of photoelectron track lengths in proportional counter gases is important for optimizing the pixel size and the dimensions of the active region in electron-drift time projection chambers (TPCs) and NITPC X-ray polarimeters.

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关键词

chemical analysis,drift chambers,gas mixtures,log normal distribution,particle track visualisation,time projection chambers,Brookhaven National Laboratory,NITPC X-ray polarimeters,National Synchrotron Light Source,Ne CO2+CH3NO2 gas mixture,active region,electron volt energy 3 keV to 8 keV,electron-drift time projection chambers,lognormal distribution,mean track length,negative ion time projection chamber,photoelectron track length distributions,pixel size,power-law distribution,proportional counter gases,quantitative analysis,${rm CH}_{3}{rm NO}_2$,Negative ion time projection chamber,X-ray detectors,nitro methane,photoelectron track length

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