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. Punjabi; W. Xiong; X. Yan; L. Ye; Y. Zhang

doi:10.1016/j.nima.2021.165300

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 journal › Article › peer-review

3 Citations (Scopus)

Abstract

We report on a windowless, high-density, gas-flow target at Jefferson Lab that was used to measure r_p, 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 r_p by reaching unprecedentedly low values of Q², the square of the electron's transfer of four-momentum to the proton.

Original language	English
Article number	165300
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1003
DOIs	https://doi.org/10.1016/j.nima.2021.165300
Publication status	Published - 1 Jul 2021
Externally published	Yes

Keywords

Gas target
Hydrogen target
Proton charge radius

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10.1016/j.nima.2021.165300

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Pierce, J., Brock, J., Carlin, C., Keith, C., Maxwell, J., Meekins, D., Bai, X., Deur, A., Dutta, D., Gao, H., Gasparian, A., Gnanvo, K., Gu, C., Higinbotham, D., Khandaker, M., Liyanage, N., Meziane, M., Pasyuk, E., Peng, C., ... Zhang, Y. (2021). The PRad windowless gas flow target. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1003, Article 165300. https://doi.org/10.1016/j.nima.2021.165300

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title = "The PRad windowless gas flow target",

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.",

keywords = "Gas target, Hydrogen target, Proton charge radius",

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

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year = "2021",

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doi = "10.1016/j.nima.2021.165300",

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Pierce, J, Brock, J, Carlin, C, Keith, C, Maxwell, J, Meekins, D, Bai, X, Deur, A, Dutta, D, Gao, H, Gasparian, A, Gnanvo, K, Gu, C, Higinbotham, D, Khandaker, M, Liyanage, N, Meziane, M, Pasyuk, E, Peng, C, Punjabi, V, Xiong, W, Yan, X, Ye, L & Zhang, Y 2021, 'The PRad windowless gas flow target', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 1003, 165300. https://doi.org/10.1016/j.nima.2021.165300

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.

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 -

The PRad windowless gas flow target

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Keywords

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