TY - JOUR
T1 - The PRad windowless gas flow target
AU - Pierce, J.
AU - Brock, J.
AU - Carlin, C.
AU - Keith, C.
AU - Maxwell, J.
AU - Meekins, D.
AU - Bai, X.
AU - Deur, A.
AU - Dutta, D.
AU - Gao, H.
AU - Gasparian, A.
AU - Gnanvo, K.
AU - Gu, C.
AU - Higinbotham, D.
AU - Khandaker, M.
AU - Liyanage, N.
AU - Meziane, M.
AU - Pasyuk, E.
AU - Peng, C.
AU - Punjabi, V.
AU - Xiong, W.
AU - Yan, X.
AU - Ye, L.
AU - Zhang, Y.
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - 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.
AB - 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.
KW - Gas target
KW - Hydrogen target
KW - Proton charge radius
UR - http://www.scopus.com/inward/record.url?scp=85104394495&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2021.165300
DO - 10.1016/j.nima.2021.165300
M3 - Article
AN - SCOPUS:85104394495
SN - 0168-9002
VL - 1003
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
M1 - 165300
ER -