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

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

doi:10.1109/TNS.2014.2312107

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

Journal article

Peer reviewed

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

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

IEEE transactions on nuclear science, Vol.61(2), pp.894-900

04/2014

DOI: 10.1109/TNS.2014.2312107

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https://arxiv.org/pdf/1406.4393View

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Abstract

We report photoelectron track length distributions between 3 and 8 keV in gas mixtures of Ne + CO 2 + CH 3 NO 2 (260:80:10 Torr) and CO 2 + CH 3 NO 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/E o ) n , is found to fit the relationship between mean track length and energy. We find n = 1.29±0.07 for Ne + CO 2 + CH 3 NO 2 and n = 1.20±0.09 for CO 2 + CH 3 NO 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.

Detectors

Electrodes

Electron mobility

Length measurement

Negative ion time projection chamber

nitro methane

photoelectron track length

Strips

Uncertainty

X-ray detectors

X-ray imaging

{\rm CH}_{3}{\rm NO}_2

Details

Title: Subtitle: Photoelectron Track Length Distributions Measured in a Negative Ion Time Projection Chamber
Creators: Z. R Prieskorn - Pennsylvania State University
J. E Hill - Goddard Space Flight Center
P. E Kaaret - University of Iowa
J. K Black - Silver Spring Networks
Resource Type: Journal article
Publication Details: IEEE transactions on nuclear science, Vol.61(2), pp.894-900
DOI: 10.1109/TNS.2014.2312107
ISSN: 0018-9499
eISSN: 1558-1578
Publisher: IEEE
Grant note: NNX08AF46G; NNX07AF21G / National Aeronautics and Space Administration; NASA (10.13039/100000104)
Language: English
Date published: 04/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984199773802771

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