1. Photoelectron Track Length Distributions Measured in a Negative Ion Time Projection Chamber.
- Author
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Prieskorn, Z. R., Hill, J. E., Kaaret, P. E., and Black, J. K.
- Subjects
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PHOTOELECTRONS , *ANIONS , *NITROMETHANE , *X-ray detection , *SYNCHROTRON radiation sources , *LIGHT sources , *NUCLEAR counters - Abstract
We report photoelectron track length distributions between 3 and 8 keV in gas mixtures of Ne + CO_2 + CH3NO_2 (260:80:10 Torr) and CO_2 + CH3NO_2 (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\pm 0.07 for Ne + CO_2 + CH3NO_2 and n = 1.20\pm 0.09 for CO_2 + CH3NO_2. 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. [ABSTRACT FROM PUBLISHER]
- Published
- 2014
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