Density Changes in Low Pressure Gas Targets for Electron Scattering Experiments

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 uA 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 uA on each target fluid are presented. Additionally, expressions for the beam current dependent fluid density of each target are developed.

8 pages, 12 figures, 4 tables

References in corpus (3)

• First Measurement of the Ar$(e,e^{\prime })X$ Cross Section at Jefferson Lab
• Thermomechanical design of a static gas target for electron accelerators
• E12-14-009: Ratio of the electric form factor in the mirror nuclei 3He and 3H

Cited by in corpus (11)

• Revealing the short-range structure of the "mirror nuclei" ${}^3$H and ${}^3$He
• Determination of the argon spectral function from (e,e'p) data
• Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements
• Measurement of the cross sections for inclusive electron scattering in the E12-14-012 experiment at Jefferson Lab
• Measurement of the Ar(e,e${}^{\prime }$ p) and Ti(e,e${}^{\prime }$ p) cross sections in Jefferson Lab Hall A
• The cross-section measurement for the ${}^3\text{H}(e,e^{\prime }{K}^{+})nn\Lambda$ reaction
• Search for a bound di-neutron by comparing ${}^3$He(e,e'p)d and ${}^3$H(e,e'p)X measurements
• Precise Beam Energy Determination for Hall A after the CEBAF 12 GeV Upgrade
• A novel measurement of the neutron magnetic form factor from A=3 mirror nuclei
• Backward-angle electroproduction of ${\eta }^{\prime }$ mesons off protons at $W=2.13\text{GeV}$ and $Q^2=0.46{\left(\text{GeV}/c\right)}^2$
• Precision measurements of A=3 nuclei in Hall B