The PRad windowless gas flow target

J. Pierce, J. Brock, C. Carlin, C. Keith*, J. Maxwell, D. Meekins, X. Bai, A. Deur, D. Dutta, H. Gao, A. Gasparian, K. Gnanvo, C. Gu, D. Higinbotham, M. Khandaker, N. Liyanage, M. Meziane, E. Pasyuk, C. Peng, V. PunjabiW. Xiong, X. Yan, L. Ye, Y. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We report on a windowless, high-density, gas-flow target at Jefferson Lab that was used to measure rp, the root-mean-square charge radius of the proton. The target achieved its design goal of an areal density of 2 × 1018 atoms/cm2, with the gas uniformly distributed over the 4 cm length of the cell and less than 1% residual gas outside the cell. This design eliminated scattering from the end caps of the target cell, a problem endemic to previous measurements of the proton charge radius in electron scattering experiments, and permitted a precise, model-independent extraction of rp by reaching unprecedentedly low values of Q2, the square of the electron's transfer of four-momentum to the proton.

Original languageEnglish
Article number165300
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume1003
DOIs
Publication statusPublished - 1 Jul 2021
Externally publishedYes

Keywords

  • Gas target
  • Hydrogen target
  • Proton charge radius

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