The Qweak experimental apparatus

被引：29

作者：

Allison, T. ^{[1
]}

Anderson, M. ^{[2
]}

Androic, D. ^{[3
]}

Armstrong, D. S. ^{[4
]}

Asaturyan, A. ^{[5
]}

Averett, T. ^{[4
]}

Averill, R. ^{[6
]}

Balewski, J. ^{[6
]}

Beaufait, J. ^{[1
]}

Beminiwattha, R. S. ^{[7
]}

Benesch, J. ^{[1
]}

Benmokhtar, F. ^{[8
]}

Bessuille, J. ^{[9
]}

Birchall, J. ^{[2
]}

Bonnelli, E. ^{[10
]}

Bowman, J. D. ^{[11
]}

Brindza, P. ^{[1
]}

Brown, D. B. ^{[12
]}

Carlini, R. D. ^{[1
,4
]}

Cates, G. D. ^{[13
]}

Cavness, B. ^{[14
]}

Clark, G. ^{[9
]}

Cornejo, J. C. ^{[4
]}

Dusa, S. Covrig ^{[1
]}

Dalton, M. M. ^{[13
]}

Davis, C. A. ^{[9
]}

Dean, D. C. ^{[4
]}

Deconinck, W. ^{[4
]}

Diefenbach, J. ^{[15
]}

Dow, K. ^{[6
]}

Dowd, J. F. ^{[4
]}

Dunne, J. A. ^{[12
]}

Dutta, D. ^{[12
]}

Duvall, W. S. ^{[10
]}

Echols, J. R. ^{[10
]}

Elaasar, M. ^{[16
]}

Falk, W. R. ^{[2
]}

Finelli, K. D. ^{[10
]}

Finn, J. M. ^{[4
]}

Gaskell, D. ^{[1
]}

Gericke, M. T. W. ^{[2
]}

Grames, J. ^{[1
]}

Gray, V. M. ^{[4
]}

Grimm, K. ^{[4
,13
,17
]}

Guo, F. ^{[6
]}

Hansknecht, J. ^{[1
]}

Harrison, D. J. ^{[18
]}

Henderson, E. ^{[4
]}

Hoskins, J. R. ^{[4
]}

Ihloff, E. ^{[6
]}

机构：

[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[2] Univ Manitoba, Winnipeg, MB R3T 2N2, Canada

[3] Univ Zagreb, HR-10002 Zagreb, Croatia

[4] Coll William & Mary, Williamsburg, VA 23185 USA

[5] Yerevan Phys Inst, AI Alikhanyan Natl Sci Lab, Yerevan 0036, Armenia

[6] MIT, Cambridge, MA 02139 USA

[7] Ohio Univ, Athens, OH 45701 USA

[8] Christopher Newport Univ, Newport News, VA 23606 USA

[9] TRIUMF, Vancouver, BC V6T 2A3, Canada

[10] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[11] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[12] Mississippi State Univ, Mississippi State, MS 39762 USA

[13] Univ Virginia, Charlottesville, VA 22903 USA

[14] Angelo State Univ, San Angelo, TX 76909 USA

[15] Hampton Univ, Hampton, VA 23668 USA

[16] Southern Univ New Orleans, New Orleans, LA 70126 USA

[17] Louisiana Tech Univ, Ruston, LA 71272 USA

[18] Univ Winnipeg, Winnipeg, MB R3B 2E9, Canada

[19] Univ Connecticut, Storrs, CT 06269 USA

[20] Univ No British Columbia, Prince George, BC V2N4Z9, Canada

[21] Kent State Univ, Kent, OH 44240 USA

[22] George Washington Univ, Washington, DC 20052 USA

[23] Univ New Hampshire, Durham, NH 03824 USA

[24] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[25] Hendrix Coll, Conway, AR 72032 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2015年 / 781卷

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

Parity violation; Electron scattering; High luminosity; Liquid hydrogen target; Particle detectors; FORM-FACTORS; POLARIZATION; READOUT;

D O I：

10.1016/j.nima.2015.01.023

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Jefferson Lab experiment determined the weak charge of the proton by measuring the parity-violating elastic scattering asymmetry of longitudinally polarized electrons from an unpolarized liquid hydrogen target at small momentum transfer. A custom apparatus was designed for this experiment to meet the technical challenges presented by the smallest and most precise (e) over right arrowp asymmetry ever measured. Technical milestones were achieved at Jefferson Lab in target power, beam current, beam helicity reversal rate, polarimetry, detected rates, and control of helicity-correlated beam properties. The experiment employed 180 mu A of 89% longitudinally polarized electrons whose helicity was reversed 960 times per second. The electrons were accelerated to 1.16 GeV and directed to a beamline with extensive instrumentation to measure helicity-correlated beam properties that can induce false asymmetries. Muller and Compton polarimetry were used to measure the electron beam polarization to better than 1%. The electron beam was incident on a 34.4 cm liquid hydrogen target. After passing through a triple collimator system, scattered electrons between 5.8 degrees and 11.6 degrees were bent in the toroidal magnetic field of a resistive copper-coil magnet. The electrons inside this acceptance were focused onto eight fused silica Cherenkov detectors arrayed symmetrically around the beam axis. A total scattered electron rate of about 7 GHz was incident on the detector array. The detectors were read out in integrating mode by custom-built low-noise pre-amplifiers and 18-bit sampling ADC modules. The momentum transfer Q(2)=0.025 GeV2 was determined using dedicated low-current (similar to 100 pA) measurements with a set of drift chambers before (and a set of drift chambers and trigger scintillation counters after) the toroidal magnet. (C) 2015 Elsevier B.V All rights reserved.

引用

页码：105 / 133

页数：29

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