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Density changes in low pressure gas targets for electron scattering experiments

Santiesteban, S. N. and Alsalmi, S. and Meekins, D. and Ayerbe Gayoso, C. and Bane, J. and Barcus, S. and Campbell, J. and Castellanos, J. and Cruz-Torres, R. and Dai, H. and Hague, T. and Hauenstein, F. and Higinbotham, D. W. and Holt, R. J. and Kutz, T. and Li, S. and Liu, H. and McClellan, R. E. and Nycz, M. and Nguyen, D. and Pandey, B. and Pandey, V. and Schmidt, A. and Su, T. and Ye, Z. (2019) Density changes in low pressure gas targets for electron scattering experiments. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 940 . pp. 351-358. ISSN 0168-9002. http://resolver.caltech.edu/CaltechAUTHORS:20190614-153312794

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Abstract

A system of modular sealed gas target cells has been developed for use in electron scattering experiments at the Thomas Jefferson National Accelerator Facility (Jefferson Lab). This system was initially developed to complete the MARATHON experiment which required, among other species, tritium as a target material. Thus far, the cells have been loaded with the gas species 3H, 3He, 2H, 1H and 40Ar and operated in nominal beam currents of up to 22.5 A in Jefferson Lab’s Hall A. While the gas density of the cells at the time of loading is known, the density of each gas varies uniquely when heated by the electron beam. To extract experimental cross sections using these cells, density dependence on beam current of each target fluid must be determined. In this study, data from measurements with several beam currents within the range of 2.5 to 22.5 A on each target fluid are presented. Additionally, expressions for the beam current dependent fluid density of each target are developed.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.nima.2019.06.025DOIArticle
https://arxiv.org/abs/1811.12167arXivDiscussion Paper
Additional Information:© 2019 Published by Elsevier. Received 7 March 2019, Revised 12 June 2019, Accepted 12 June 2019, Available online 14 June 2019. We wish to thank the staff of the Thomas Jefferson National Accelerator Facility for their help safely installing and removing the tritium cells. We also acknowledge the critical efforts of Savannah River Site and Savannah River Tritium Enterprises. And special thank to Marcy Stutzman for proofreading this manuscript. This work was supported by the U.S. Department of Energy (DOE) contract DE-AC05-06OR23177 under which Jefferson Science Associates operates the Thomas Jefferson National Accelerator Facility, DOE contract DE-AC02-06CH11357, DOE contract de-sc0013615, and by National Science Foundation (NSF) Grant No. NSF PHY 1506459.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC05-06OR23177
NSFPHY-1506459
Department of Energy (DOE)DE-AC02-06CH11357
Department of Energy (DOE)DE-SC0013615
Subject Keywords:Target; Tritium; Helium; Deuterium; Hydrogen; Argon
Record Number:CaltechAUTHORS:20190614-153312794
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190614-153312794
Official Citation:S.N. Santiesteban, S. Alsalmi, D. Meekins, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Campbell, J. Castellanos, R. Cruz-Torres, H. Dai, T. Hague, F. Hauenstein, D.W. Higinbotham, R.J. Holt, T. Kutz, S. Li, H. Liu, R.E. McClellan, M. Nycz, D. Nguyen, B. Pandey, V. Pandey, A. Schmidt, T. Su, Z. Ye, Density changes in low pressure gas targets for electron scattering experiments, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 940, 2019, Pages 351-358, ISSN 0168-9002, https://doi.org/10.1016/j.nima.2019.06.025. (http://www.sciencedirect.com/science/article/pii/S0168900219308654)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96451
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Jun 2019 14:33
Last Modified:12 Jul 2019 23:01

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