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1. Ce+BAF : Positron Beams at Jefferson Lab

Author: Joseph Grames, Lawrence Cardman, Silviu Covrig, Jay Benesch, Max Bruker, Probir Ghoshal, Sandesh Gopinath, Joe Gubeli, Sami Habet, Carlos Hernandez-Garcia, Alicia Hofler, Reza Kazimi, Fanglei Lin, Sergei Nagaitsev, Matthew Poelker, Bob Rimmer, Yves Roblin, Victor Lizarraga-Rubio, Andrei Seryi, Michael Spata, Amy Sy, Dennis Turner, Andriy Ushakov, Cristhian Valerio-Lizarraga, and Eric Voutier
Published: 2023

2. Measurement of the beam-normal single-spin asymmetry for elastic electron scattering from C12 and Al27

Author: R. W. Radloff, S. A. Page, John M. Finn, L. Lee, V. Tvaskis, L. Z. Ndukum, K. E. Mesick, S. Kowalski, Jongmin Lee, W. S. Duvall, A. Mkrtchyan, A. R. Lee, C. A. Davis, P. Solvignon, William A. Tobias, J. Leacock, Jay Benesch, J. A. Dunne, F. Guo, H. Mkrtchyan, M. M. Dalton, R. D. Carlini, B. Sawatzky, S. MacEwan, T. Seva, W. D. Ramsay, E. Korkmaz, D. G. Meekins, Kent Paschke, P. M. King, V. M. Gray, V. Tadevosyan, D. C. Jones, J. C. Cornejo, Jean-Francois Rajotte, J. Pan, M. H. Shabestari, P. Wang, J. A. Magee, R. S. Beminiwattha, Michael Gericke, R. Michaels, Fatiha Benmokhtar, Wouter Deconinck, B. Waidyawansa, D. S. Armstrong, Jonathan W. Martin, R. Subedi, S. Covrig Dusa, M. Kargiantoulakis, J. Leckey, Dipanwita Dutta, S. P. Wells, W. R. Falk, S. A. Wood, P. Zang, Darko Androić, D. T. Spayde, Vladimir Nelyubin, D. J. Mack, S. Zhamkochyan, M. E. Christy, A. Asaturyan, R. Silwal, J. F. Dowd, S. K. Phillips, T. A. Forest, J. Birchall, M. Elaasar, Geoffrey Smith, A. Subedi, R. Mahurin, M. J. McHugh, Riad Suleiman, Michael Pitt, Amrendra Narayan, D. Gaskell, V. Owen, C. Gal, W. T. H. van Oers, Nuruzzaman, J. R. Hoskins, Juliette Mammei, K. Bartlett, J. Roche, and Neven Simicevic
Subjects: Elastic scattering, Physics, Range (particle radiation), 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, 01 natural sciences, Asymmetry, Nuclear physics, Momentum, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Beam (structure), Spin-½, media_common
Abstract: We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries $B_n$ on $^{12}$C and $^{27}$Al, obtained with an electron beam polarized transverse to its momentum direction. These measurements add an additional kinematic point to a series of previous measurements of $B_n$ on $^{12}$C and provide a first measurement on $^{27}$Al. The experiment utilized the Qweak apparatus at Jefferson Lab with a beam energy of 1.158 GeV. The average lab scattering angle for both targets was 7.7 degrees, and the average $Q^2$ for both targets was 0.02437 GeV$^2$ (Q=0.1561 GeV). The asymmetries are $B_n$ = -10.68 $\pm$ 0.90 stat) $\pm$ 0.57 (syst) ppm for $^{12}$C and $B_n$ = -12.16 $\pm$ 0.58 (stat) $\pm$ 0.62 (syst) ppm for $^{27}$Al. The results are consistent with theoretical predictions, and are compared to existing data. When scaled by Z/A, the Q-dependence of all the far-forward angle (theta < 10 degrees) data from $^{1}$H to $^{27}$Al can be described by the same slope out to $Q \approx 0.35$ GeV. Larger-angle data from other experiments in the same Q range are consistent with a slope about twice as steep.
Published: 2021

3. Accurate Determination of the Neutron Skin Thickness of Pb208 through Parity-Violation in Electron Scattering

Author: S. Rahman, H. Albataineh, B. Yale, K. S. Kumar, S. Seeds, A. Deshpande, C. Ayerbe Gayoso, A. Yoon, Q. Campagna, G. M. Urciuoli, G. Leverick, R. Mammei, Bogdan Wojtsekhowski, D. S. Armstrong, Paul Souder, Siyu Jian, C. Palatchi, S. Johnston, C. Jantzi, H. Bhatt, P. E. Reimer, B. Karki, Dipangkar Dutta, T. Ye, D. King, D. McNulty, M. Knauss, L. G. Tang, J. C. Cornejo, T. Gautam, S. Katugampola, P. M. King, R. W. Radloff, H. Liu, J. O. Hansen, J. Pan, D. C. Jones, Michael Pitt, S. Riordan, E. W. Wertz, S. Park, R. Michaels, Y. Tian, C. Metts, M. N. H. Rashad, P. Datta, S. Premathilake, S. Malace, W. Zhang, S. Covrig Dusa, Y. Roblin, I. Halilovic, K. A. Aniol, T. Averett, S. Barcus, C. Feldman, N. Liyange, B. Pandey, A. Zec, E. Fuchey, Charles Horowitz, Jay Benesch, Michaela Thiel, Kent Paschke, A. Narayan, C. Ghosh, D. Adhikari, Brendan Reed, B. P. Quinn, Jiawen Zhang, F. Hauenstein, Cynthia Keppel, M. Petrusky, Darko Androić, G. D. Cates, D. G. Meekins, R. Richards, V. Bellini, N. Lashley-Colthirst, A. Rathnayake, M. M. Mondal, X. Zheng, Michael Gericke, M. McCaughan, Andrew Puckett, Juliette Mammei, A. Camsonne, A. Shahinyan, B. Blaikie, C. Clarke, D. Gaskell, Y. Chen, Jim Napolitano, V. Owen, C. Gal, D. Nikolaev, D. Bhetuwal, R. S. Beminiwattha, W. Henry, T. Kutz, and D. Bhatta Pathak
Subjects: Elastic scattering, Physics, Equation of state (cosmology), media_common.quotation_subject, Form factor (quantum field theory), General Physics and Astronomy, 01 natural sciences, Asymmetry, 0103 physical sciences, Saturation (graph theory), Neutron, Atomic physics, 010306 general physics, Electron scattering, Energy (signal processing), media_common
Abstract: We report a precision measurement of the parity-violating asymmetry A_{PV} in the elastic scattering of longitudinally polarized electrons from ^{208}Pb. We measure A_{PV}=550±16(stat)±8(syst) parts per billion, leading to an extraction of the neutral weak form factor F_{W}(Q^{2}=0.00616 GeV^{2})=0.368±0.013. Combined with our previous measurement, the extracted neutron skin thickness is R_{n}-R_{p}=0.283±0.071 fm. The result also yields the first significant direct measurement of the interior weak density of ^{208}Pb: ρ_{W}^{0}=-0.0796±0.0036(exp)±0.0013(theo) fm^{-3} leading to the interior baryon density ρ_{b}^{0}=0.1480±0.0036(exp)±0.0013(theo) fm^{-3}. The measurement accurately constrains the density dependence of the symmetry energy of nuclear matter near saturation density, with implications for the size and composition of neutron stars.
Published: 2021

4. The GlueX beamline and detector

Author: T. Whitlatch, N. Wickramaarachchi, N. Cao, Ilya Larin, Michael Dugger, N. K. Walford, V. V. Tarasov, Gerard Visser, W. Phelps, J. Frye, B. Liu, J. Stewart, V. Razmyslovich, S. Schadmand, B. E. Cannon, C.P. Romero, O. Cortes, F. Nerling, S. Adhikari, M. M. Dalton, G. Voulgaris, C. S. Akondi, W. J. Briscoe, J. R. Stevens, W. D. Crahen, G.H. Biallas, H. Marukyan, R.S. Pedroni, C. Gleason, W. McGinley, P. Eugenio, E. Wolin, V. Crede, C. Carlin, L. A. Teigrob, F. Mokaya, T. C. Black, A. Toro, D. G. Meekins, I. A. Semenova, Elton Smith, A. Thiel, Kamal K. Seth, G. J. Lolos, A. M. Schertz, Todd Satogata, G. Kalicy, T. Daniels, N. S. Jarvis, A. Hamdi, I. I. Strakovsky, N. Qin, Mark Richard James Williams, I. Vega, A. Tsaris, Y. Yang, K. Goetzen, T. Erbora, J. Leckey, W. U. Boeglin, R. T. Jones, S. Fegan, D. S. Carman, K. Suresh, V. V. Berdnikov, Barry Ritchie, G. Vasileiadis, T. Carstens, E. Barriga, H. Al Ghoul, K. Moriya, J. Hardin, A. Gerasimov, M. E. McCracken, A. Deur, C. D. Keith, M. J. Staib, Hovanes Egiyan, A. Ali, Vladimir Popov, Jay Benesch, A. Hurley, C. Dickover, Viktor Matveev, Dmitri Romanov, A. Dolgolenko, B. Pratt, Justin I. McIntyre, C. A. Meyer, R. Mendez, A. R. Dzierba, C. Hutton, N. Sandoval, G. M. Huber, L. Guo, Z. Papandreou, Zhiyong Zhang, D. I. Sober, E. Pooser, J. Foote, J. Zarling, M. M. Ito, O. Chernyshov, Blake Leverington, S. Cole, P. Brindza, H. Hakobyan, A. Barnes, Sean A Dobbs, E. G. Anassontzis, T. D. Beattie, D. Werthmüller, X. Shen, Amiran Tomaradze, M. Patsyuk, J. Ritman, M. McCaughan, C. Fanelli, Yujie Qiang, R. A. Miskimen, A. Somov, R. Kliemt, F. Barbosa, A. Austregesilo, R. Dzhygadlo, C. Salgado, B. C.L. Sumner, L. Robison, Joerg Reinhold, Ting Xiao, A. Schick, V. Kakoyan, William Brooks, D. J. Mack, W. I. Levine, N. Gevorgyan, S. Katsaganis, E. Chudakov, Pavlos Ioannou, Lubomir Pentchev, A. Goncalves, A. Yu. Semenov, A. I. Ostrovidov, A. M. Foda, R. Dotel, M. Kamel, R. A. Schumacher, D. G. Ireland, W. B. Li, M. R. Shepherd, Ashot Gasparian, A. Teymurazyan, Krisztian Peters, J. Barlow, B. Zihlmann, Xiang Zhou, J. Pierce, S. Taylor, N. Sparks, L. Gan, S. Somov, L. Ng, A. Ernst, D. Kolybaba, K. Livingston, V. S. Goryachev, Cornelius Schwarz, P. Mattione, Y. Van Haarlem, P. Pauli, I. Tolstukhin, J. Schwiening, M. J. Amaryan, D. Lawrence, J. Brock, H. Ni, C. Stanislav, V. Lyubovitskij, S. Furletov, T. Britton, R. Barsotti, C. Paudel, Christine Kourkoumelis, Sergey Kuleshov, R. E. Mitchell, D. I. Lersch, C. L. Henschel, Q. Zhou, O. Soto, Friedrich Klein, and S.T. Krueger
Subjects: Nuclear and High Energy Physics, GlueX, детектор, Physics - Instrumentation and Detectors, Photon, Physics::Instrumentation and Detectors, фотонный пучок, FOS: Physical sciences, Scintillator, 01 natural sciences, Optics, Hodoscope, 0103 physical sciences, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, GlueX, Spectrometer, Calorimeter (particle physics), 010308 nuclear & particles physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Beamline, High Energy Physics::Experiment, business
Abstract: The GlueX experiment at Jefferson Lab has been designed to study photoproduction reactions with a 9-GeV linearly polarized photon beam. The energy and arrival time of beam photons are tagged using a scintillator hodoscope and a scintillating fiber array. The photon flux is determined using a pair spectrometer, while the linear polarization of the photon beam is determined using a polarimeter based on triplet photoproduction. Charged-particle tracks from interactions in the central target are analyzed in a solenoidal field using a central straw-tube drift chamber and six packages of planar chambers with cathode strips and drift wires. Electromagnetic showers are reconstructed in a cylindrical scintillating fiber calorimeter inside the magnet and a lead-glass array downstream. Charged particle identification is achieved by measuring energy loss in the wire chambers and using the flight time of particles between the target and detectors outside the magnet. The signals from all detectors are recorded with flash ADCs and/or pipeline TDCs into memories allowing trigger decisions with a latency of 3.3 $\mu$s. The detector operates routinely at trigger rates of 40 kHz and data rates of 600 megabytes per second. We describe the photon beam, the GlueX detector components, electronics, data-acquisition and monitoring systems, and the performance of the experiment during the first three years of operation., Comment: Accepted by Nuclear Instruments and Methods A, 78 pages, 54 figures
Published: 2021

5. Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering

Author: Wouter Deconinck, Riad Suleiman, M. H. Shabestari, L. Z. Ndukum, William A. Tobias, C. A. Davis, J. Leckey, J. A. Magee, S. Yang, Jongmin Lee, Amrendra Narayan, P. Solvignon, mrow, J. Roche, V. Tvaskis, M. M. Dalton, W. D. Ramsay, A. Mkrtchyan, S. MacEwan, D. Gaskell, M. Elaasar, Nuruzzaman, J. Beaufait, T. Seva, E. Korkmaz, V. M. Gray, A. R. Lee, B. Waidyawansa, D. T. Spayde, S. Covrig Dusa, Jean-Francois Rajotte, Roger Carlini, S. K. Phillips, mrow> weak, R. Subedi, M. K. Jones, Kent Paschke, K. Bartlett, S. A. Wood, P. Wang, Neven Simicevic, V. Owen, A. Asaturyan, W. R. Falk, J. Leacock, R. W. Radloff, R. Mahurin, P. Zang, Dipangkar Dutta, V. Tadevosyan, C. Gal, Fatiha Benmokhtar, J.C. Cornejo, K. E. Mesick, L. Lee, Vladimir Nelyubin, P. M. King, A. M. Micherdzinska, S. A. Page, F. Guo, H. Mkrtchyan, D. J. Mack, Darko Androić, R. S. Beminiwattha, mtext, A. Subedi, S. Zhamkochyan, W. T. H. van Oers, M. Kargiantoulakis, T. A. Forest, Michael Gericke, J. F. Dowd, Joseph Grames, S. Wells, J. M. Finn, K. Grimm, J. Pan, R. Silwal, J. A. Dunne, B. Sawatzky, D. C. Jones, R. Michaels, J. R. Hoskins, J. Birchall, Juliette Mammei, S. Kowalski, W. S. Duvall, J. W. Martin, J. Mei, N. Morgan, msub, R. T. Jones, Jay Benesch, Michael Pitt, D. G. Meekins, D. S. Armstrong, G. R. Smith, and M. J. McHugh
Subjects: Physics, Scattering, media_common.quotation_subject, General Physics and Astronomy, FOS: Physical sciences, Observable, Electron, beam-normalization, single-spin asymmetry, scattering, transversaly polarized electrons, unpolarized nucleons, 01 natural sciences, Asymmetry, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment, Energy (signal processing), Beam (structure), Spin-½, media_common
Abstract: A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of theta_lab = 7.9 degrees and a mean energy of 1.149 GeV. The asymmetry result is B_n = -5.194 +- 0.067 (stat) +- 0.082 (syst) ppm. This is the most precise measurement of this quantity available to date and therefore provides a stringent test of two-photon exchange models at far-forward scattering angles (theta_lab -> 0) where they should be most reliable., 6 pages, 3 figures; Slightly revised version, after referee's comments; accepted in PRL
Published: 2020

6. Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Author: Yan Wang, M. Tiefenback, Riad Suleiman, Carlos Hernandez-Garcia, M. A. Mamun, G. Palacios-Serrano, Helmut Baumgart, J. Jordan, Shukui Zhang, Philip Adderley, Joseph Grames, J. Hansknecht, Jay Benesch, R. Montoya Soto, B. Bullard, M. Poelker, Geoffrey Krafft, C. A. Valerio Lizarraga, Joseph Gubeli, A. Canales Ramos, R. Kazimi, S. Wijethunga, F. E. Hannon, Marcy Stutzman, and J. Yoskowitz
Subjects: Nuclear and High Energy Physics, Materials science, Physics and Astronomy (miscellaneous), business.industry, High voltage, Insulator (electricity), Surfaces and Interfaces, Photocathode, Anode, Ion, Antimonide, Optoelectronics, Quantum efficiency, Thermal emittance, business
Abstract: This contribution describes the latest milestones of a multiyear program to build and operate a compact $\ensuremath{-}300\text{ }\text{ }\mathrm{kV}$ dc high voltage photogun with inverted insulator geometry and alkali-antimonide photocathodes. Photocathode thermal emittance measurements and quantum efficiency charge lifetime measurements at average current up to 4.5 mA are presented, as well as an innovative implementation of ion generation and tracking simulations to explain the benefits of a biased anode to repel beam line ions from the anode-cathode gap, to dramatically improve the operating lifetime of the photogun and eliminate the occurrence of micro-arc discharges.
Published: 2019

7. A novel comparison of Møller and Compton electron-beam polarimeters

Author: Dipangkar Dutta, William A. Tobias, Amber McCreary, W.D. Ramsay, A. Mkrtchyan, B. S. Cavness, Douglas Storey, Kent Paschke, S. A. Page, C. Vidal, Amrendra Narayan, D. Gaskell, L. A. Dillon-Townes, D. C. Jones, P. Wang, Erik Urban, M. McDonald, J.C. Cornejo, J. R. Hoskins, R. S. Beminiwattha, Vladimir Nelyubin, A. Asaturyan, M. M. Dalton, Wouter Deconinck, S. Zhamkotchyan, E. Ihloff, P. Solvignon, G. Hays, R. T. Jones, P. M. King, S. Kowalski, J. W. Martin, V. Tvaskis, J. A. Magee, A. Micherdzinska, B. Waidyawansa, H. Mkrtchyan, L. Lee, Jay Benesch, Leonid Kurchaninov, G. D. Cates, Massachusetts Institute of Technology. Department of Physics, and Kowalski, Stanley B
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, media_common.quotation_subject, Polarimetry, Electron, Electron polarimetry, 01 natural sciences, Asymmetry, Møller polarimeter, Optics, Compton polarimeter, 0103 physical sciences, High current, 010306 general physics, Nuclear Experiment, media_common, Physics, 010308 nuclear & particles physics, business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, Compton scattering, Polarimeter, Polarization (waves), lcsh:QC1-999, Computational physics, Cathode ray, Physics::Accelerator Physics, business, lcsh:Physics, Jefferson Lab
Abstract: We have performed a novel comparison between electron-beam polarimeters based on Møller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents (< 5μA) during the Q[subscript weak] experiment in Hall-C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 μA) operation of the Compton polarimeter. All measurements were found to be consistent within experimental uncertainties of 1% or less, demonstrating that electron polarization does not depend significantly on the beam current. This result lends confidence to the common practice of applying Møller measurements made at low beam currents to physics experiments performed at higher beam currents. The agreement between two polarimetry techniques based on independent physical processes sets an important benchmark for future precision asymmetry measurements that require sub-1% precision in polarimetry. Keywords: Electron polarimetry, Compton polarimeter, Møller polarimeter, Jefferson Lab, United States. Department of Energy (Contract AC05-06OR23177), Natural Sciences and Engineering Research Council of Canada
Published: 2017

8. Precision Measurement of the Weak Charge of the Proton

Author: K. Bartlett, K. E. Mesick, W. R. Falk, P. M. King, R. S. Beminiwattha, A. Asaturyan, J. Leckey, P. Zang, J. Leacock, T. Averett, D. T. Spayde, M. M. Dalton, Ross D. Young, W. D. Ramsay, Vladimir Nelyubin, J. Balewski, J. F. Dowd, J. Roche, S. Yang, Darko Androić, A. Micherdzinska, M. Kargiantoulakis, John M. Finn, J. A. Magee, Kent Paschke, Jongmin Lee, R. W. L. Jones, P. Solvignon, S. Kowalski, L. Z. Ndukum, W. S. Duvall, S. Zhamkochyan, J. Birchall, V. Tvaskis, Riad Suleiman, A. R. Lee, B. Waidyawansa, J. Pan, D. C. Jones, Fatiha Benmokhtar, Wouter Deconinck, Jonathan W. Martin, S. Covrig Dusa, L. Lee, A. Mkrtchyan, Amrendra Narayan, R. Michaels, S. P. Wells, M. H. Shabestari, Geoffrey Smith, D. Gaskell, C. A. Davis, William A. Tobias, Jay Benesch, H. Mkrtchyan, Matthew Jones, Joseph Grames, S. A. Page, A. K. Opper, S. MacEwan, T. Seva, E. Korkmaz, Jean-Francois Rajotte, V. M. Gray, M. Poelker, C. Gal, D. S. Armstrong, J. A. Dunne, S. A. Wood, J. Mei, J. Beaufait, R. D. Carlini, Kathryn Grimm, F. Guo, S. K. Phillips, J. Diefenbach, P. Wang, D. J. Mack, N. Morgan, Michael Gericke, B. Sawatzky, T. A. Forest, R. Silwal, M. J. McHugh, M. Elaasar, R. Mahurin, J. C. Cornejo, Michael Pitt, R. Subedi, W. T. H. van Oers, Nuruzzaman, H. Nuhait, J. R. Hoskins, D. G. Meekins, Juliette Mammei, V. Tadevosyan, Dipangkar Dutta, Neven Simicevic, and A. Subedi
Subjects: Physics, Particle physics, Multidisciplinary, Large Hadron Collider, 010308 nuclear & particles physics, media_common.quotation_subject, Electroweak interaction, Dark matter, FOS: Physical sciences, Elementary particle, Parity (physics), Weak interaction, 7. Clean energy, 01 natural sciences, Asymmetry, 0103 physical sciences, Higgs boson, Nuclear Experiment (nucl-ex), 010306 general physics, weak charge of proton, parity violation, polarized electron beam, Nuclear Experiment, media_common
Abstract: The fields of particle and nuclear physics have undertaken extensive programs to search for evidence of physics beyond that explained by current theories. The observation of the Higgs boson at the Large Hadron Collider completed the set of particles predicted by the Standard Model (SM), currently the best description of fundamental particles and forces. However, the theory's limitations include a failure to predict fundamental parameters and the inability to account for dark matter/energy, gravity, and the matter-antimater asymmetry in the universe, among other phenomena. Given the lack of additional particles found so far through direct searches in the post-Higgs era, indirect searches utilizing precise measurements of well predicted SM observables allow highly targeted alternative tests for physics beyond the SM. Indirect searches have the potential to reach mass/energy scales beyond those directly accessible by today's high-energy accelerators. The value of the weak charge of the proton Q_W^p is an example of such an indirect search, as it sets the strength of the proton's interaction with particles via the well-predicted neutral electroweak force. Parity violation (invariance under spatial inversion (x,y,z) -> (-x,-y,-z)) is violated only in the weak interaction, thus providing a unique tool to isolate the weak interaction in order to measure the proton's weak charge. Here we report Q_W^p=0.0719+-0.0045, as extracted from our measured parity-violating (PV) polarized electron-proton scattering asymmetry, A_ep=-226.5+-9.3 ppb. Our value of Q_W^p is in excellent agreement with the SM, and sets multi-TeV-scale constraints on any semi-leptonic PV physics not described within the SM., Direct link to Nature Version "https://rdcu.be/954U"
Published: 2019

9. Simultaneous optimization of the cavity heat load and trip rates in linacs using a genetic algorithm

Author: Balša Terzić, Alicia S. Hofler, Cody J. Reeves, Sabbir A. Khan, Geoffrey A. Krafft, Jay Benesch, Arne Freyberger, and Desh Ranjan
Subjects: Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: In this paper, a genetic algorithm-based optimization is used to simultaneously minimize two competing objectives guiding the operation of the Jefferson Lab’s Continuous Electron Beam Accelerator Facility linacs: cavity heat load and radio frequency cavity trip rates. The results represent a significant improvement to the standard linac energy management tool and thereby could lead to a more efficient Continuous Electron Beam Accelerator Facility configuration. This study also serves as a proof of principle of how a genetic algorithm can be used for optimizing other linac-based machines.
Published: 2014
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10. Magnetized electron beam for the JLEIC re-circulator cooler ring

Author: M. A. Mamun, Yan Wang, Carlos Hernandez-Garcia, Fay Hannon, Joseph Grames, M. Poelker, R. Kazimi, B. Bullard, Philip Adderley, J. Yoskovitz, Geoffrey Krafft, S. Wijiethunga, M.G. Tiefenback, Shukui Zhang, Riad Suleiman, J. Hansknecht, and Jay Benesch
Subjects: Physics, Optics, Ion beam, business.industry, Circulator, Cathode ray, Physics::Accelerator Physics, High voltage, Electron, business, Beam (structure), Ion, Electron gun
Abstract: The ion beams of the proposed Jefferson Lab Electron Ion Collider (JLEIC) must be cooled to achieve the required collision luminosity. In general, cooling is accomplished when an electron beam co-propagates with an ion beam moving at the same average velocity, but with different temperature, where the energy of chaotic motion of the ion beam is transferred to the cold electron beam. The cooling rate can be improved by about two orders of magnitude if the process occurs inside a solenoidal magnetic field – so-called magnetized cooling - that forces the electrons to follow small helical trajectories thereby increasing the interaction time with ions and improving the cooling efficiency. However, one of the challenges associated with implementing this cooling technique relates to the fringe field of the cooling solenoid which imparts a large unwanted azimuthal kick onto the electron beam that prevents the electron beam from traveling in the desired tight, well-defined volume within the solenoid. As proposed by Derbenev, the ill-effect of this fringe field can be cancelled if the electron beam is born in a similar field and encountering a fringe field upon exiting the electron gun that produces an azimuthal kick in the opposite direction, such that the two kicks cancel. Besides requiring magnetized beam, the JLEIC re-circulator cooler design requires an electron beam with very high average current and high bunch charge: 140 mA and with nanoCoulomb bunch charge. This contribution describes the latest milestones of a multiyear program to build a magnetized electron beam source based on a 350 kV DC high voltage photogun with inverted insulator geometry.
Published: 2018

11. Measurement of parity violation in electron–quark scattering

Author: William Bertozzi, A. V. Glamazdin, E. Long, D. S. Armstrong, D. McNulty, Arijit Saha, G. D. Cates, B. Waidyawansa, Bogdan Wojtsekhowski, Amrendra Narayan, J. LeRose, R. De Leo, Jongmin Lee, S. Kowalski, J. Roche, Xin Qian, D. J. Margaziotis, J. P. Chen, D. G. Meekins, Vladimir Nelyubin, Douglas Higinbotham, L. Ye, J. Huang, C. E. Hyde, C. M. Sutera, Nuruzzaman, Shalev Gilad, B. P. Quinn, N. Muangma, S. K. Phillips, R. Holmes, E. Cisbani, L. El Fassi, M. M. Dalton, S. K. Nanda, M. Mihovilovic, Kent Paschke, Yujie Qiang, John Arrington, C. W. de Jager, K. A. Aniol, R. J. Holt, K. Rider, K. Pan, P. E. Reimer, A. Giusa, P. M. King, Franco Meddi, Vincent Sulkosky, Fatiha Benmokhtar, Kiadtisak Saenboonruang, B. Sawatzky, R. S. Beminiwattha, R. Silwal, Wouter Deconinck, Nilanga Liyanage, E. Chudakov, F. Garibaldi, Ho-Young Kang, J. O. Hansen, D. Wang, T. Holmstrom, Mustafa Canan, X. Zheng, Kalyan Allada, X. Deng, S. Frullani, Diana Parno, G.V. Russo, B. Zhao, R. Subedi, Jay Benesch, K. E. Myers, Z. Ahmed, C. M. Jen, A. Deur, D. C. Jones, S. Riordan, D. Flay, C. Dutta, R. Michaels, Young Do Oh, William A. Tobias, Abdurahim Rakhman, A. Camsonne, K. Hafidi, G. M. Urciuoli, K. Grimm, V. Bellini, G. B. Franklin, J. G. Rubin, Simon Širca, R. Suleiman, M. Friend, L. Mercado, K. S. Kumar, S. Golge, Jens Erler, A. Shahinyan, Z. E. Meziani, and Paul Souder
Subjects: Physics, Quark, Particle physics, Multidisciplinary, Scattering, Physics beyond the Standard Model, media_common.quotation_subject, High Energy Physics::Phenomenology, Electroweak interaction, Parity (physics), Electron, Asymmetry, Nuclear physics, High Energy Physics::Experiment, media_common
Abstract: Symmetry permeates nature and is fundamental to all laws of physics. One example is parity (mirror) symmetry, which implies that flipping left and right does not change the laws of physics. Laws for electromagnetism, gravity and the subatomic strong force respect parity symmetry, but the subatomic weak force does not. Historically, parity violation in electron scattering has been important in establishing (and now testing) the standard model of particle physics. One particular set of quantities accessible through measurements of parity-violating electron scattering are the effective weak couplings C2q, sensitive to the quarks' chirality preference when participating in the weak force, which have been measured directly only once in the past 40 years. Here we report a measurement of the parity-violating asymmetry in electron-quark scattering, which yields a determination of 2C2u - C2d (where u and d denote up and down quarks, respectively) with a precision increased by a factor of five relative to the earlier result. These results provide evidence with greater than 95 per cent confidence that the C2q couplings are non-zero, as predicted by the electroweak theory. They lead to constraints on new parity-violating interactions beyond the standard model, particularly those due to quark chirality. Whereas contemporary particle physics research is focused on high-energy colliders such as the Large Hadron Collider, our results provide specific chirality information on electroweak theory that is difficult to obtain at high energies. Our measurement is relatively free of ambiguity in its interpretation, and opens the door to even more precise measurements in the future.
Published: 2014

12. The ${Q^{p}_{\rm Weak}}$ experiment

Author: P. Solvignon, Wouter Deconinck, Riad Suleiman, D. G. Meekins, V. M. Gray, M. Poelker, J. A. Magee, S. Yang, S. Wells, Amrendra Narayan, R. T. Jones, T. Averett, B. Waidyawansa, D. Gaskell, Jean-Francois Rajotte, K. E. Myers, S. Kowalski, W. S. Duvall, William A. Tobias, M. K. Jones, W. T. H. van Oers, J. W. Martin, F. Guo, Joseph Grames, W. R. Falk, Kent Paschke, K. Grimm, J. Balewski, D. S. Armstrong, G. R. Smith, S. Covrig, J. A. Dunne, K. Johnston, V. Tadevosyan, P. Wang, Fatiha Benmokhtar, J. Mei, Vladimir Nelyubin, T. A. Forest, M. Kargiantoulakis, J. Leacock, J.C. Cornejo, M. M. Dalton, A.K. Opper, A. Mkrtchyan, Darko Androić, R. Silwal, V. Tvaskis, M. J. McHugh, W. D. Ramsay, L. Lee, Neven Simicevic, P. M. King, R. Mahurin, R. S. Beminiwattha, Michael Gericke, D. Zou, S. Zhamkochyan, J. Diefenbach, N. Nuruzzaman, Dipangkar Dutta, Roger Carlini, S. K. Phillips, D. T. Spayde, A. M. Micherdzinska, S. A. Page, M. H. Shabestari, J. R. Hoskins, D. C. Jones, Michael Pitt, Ross D. Young, Jongmin Lee, J. Birchall, Jay Benesch, K. A. Dow, L. Z. Ndukum, J. F. Dowd, A. R. Lee, Juliette Mammei, R. Michaels, J. M. Finn, J. Pan, J. Leckey, A. Asaturyan, A. Subedi, S. A. Wood, M. Elaasar, H. Mkrtchyan, C. A. Davis, D. J. Mack, S. MacEwan, T. Seva, E. Korkmaz, B. Sawatzky, J. Beaufait, R. Subedi, and J. Roche
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Proton, media_common.quotation_subject, Physics beyond the Standard Model, Momentum transfer, Weinberg angle, Parity (physics), Electron, Condensed Matter Physics, Asymmetry, Atomic and Molecular Physics, and Optics, Nuclear physics, Physical and Theoretical Chemistry, media_common
Abstract: In May 2012, the $Q^{p}_{\rm Weak}$ collaboration completed a two year measurement program to determine the weak charge of the proton ${Q^{p}_W} = ( 1 - 4\sin^2{\theta_{W}})$ at the Thomas Jefferson National Accelerator Facility (TJNAF). The experiment was designed to produce a 4.0 % measurement of the weak charge, via a 2.5 % measurement of the parity violating asymmetry in the number of elastically scattered 1.165 GeV electrons from protons, at forward angles. At the proposed precision, the experiment would produce a 0.3 % measurement of the weak mixing angle at a momentum transfer of Q 2 = 0.026 GeV2, making it the most precise stand alone measurement of the weak mixing angle at low momentum transfer. In combination with other parity measurements, $Q^{p}_{\rm Weak}$ will also provide a high precision determination of the weak charges of the up and down quarks. At the proposed precision, a significant deviation from the Standard Model prediction could be a signal of new physics at mass scales up to ≃ 6 TeV, whereas agreement would place new and significant constraints on possible Standard Model extensions at mass scales up to ≃ 2 TeV. This paper provides an overview of the physics and the experiment, as well as a brief look at some preliminary diagnostic and analysis data.
Published: 2013

13. Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies

Author: Sadiq Setiniyaz, G. Bosson, D. Abbott, M. Ungaro, J. S. Real, A. Camsonne, C. Cuevas, Adeleke Hakeem Adeyemi, T. A. Forest, E. Forman, H. Dong, Riad Suleiman, P. Aguilera, R. Kazimi, Yiyang Zhang, Y. Kim, Y. Wang, M. Poelker, Joseph Grames, T. Michaelides, J. L. McCarter, D. McNulty, P. Harrell, S. Golge, M. Marton, Marcy Stutzman, B. Moffit, Chris Tennant, E. Fanchini, L. Richardson, J. R. Hoskins, K. Mahoney, D. Machie, Dennis Turner, E. Froidefond, M D Muhd Ali, Brian P. Josey, P. Gueye, M. Mchugh, M. Baylac, D. S. Dale, L. S. Cardman, Alessandro Variola, C.-Y. Tsai, P. L. Cole, R. Michaels, C. Munoz Camacho, Brian E. Cade, C. E. Hyde, A. P. Freyberger, D. Moser, H. Areti, Jean-François Muraz, R. Mammei, A. Opper, Philip Adderley, Jay Benesch, J. Dumas, M. McCaughan, O. Dadoun, J. Clark, K. E. Mesick, E. Voutier, S. Covert, J. Hansknecht, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), and Peppo Collaboration
Subjects: Accelerator Physics (physics.acc-ph), Positron beam, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], FOS: Physical sciences, General Physics and Astronomy, Electron, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, law.invention, Nuclear physics, High Energy Physics - Experiment (hep-ex), Positron, Electron beam accelerator, law, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Bremsstrahlung, Particle accelerator, Polarization (waves), 3. Good health, Cathode ray, Physics::Accelerator Physics, Physics - Accelerator Physics, High Energy Physics::Experiment, Atomic physics
Abstract: The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron beam in a high-$Z$ target. Positron polarization up to 82\% have been measured for an initial electron beam momentum of 8.19~MeV/$c$, limited only by the electron beam polarization. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community., Comment: 5 pages, 4 figures
Published: 2016

14. The tracking analysis in the Q-weak experiment

Author: T. Averett, M. M. Dalton, A.K. Opper, W. D. Ramsay, D. T. Spayde, K. Johnston, Kent Paschke, J. Mei, J.C. Cornejo, William A. Tobias, F. Guo, P. M. King, W. R. Falk, Vladimir Nelyubin, S. A. Wood, R. Mahurin, J. Leacock, Fatiha Benmokhtar, D. J. Mack, Jean-Francois Rajotte, S. A. Page, D. G. Meekins, J. Pan, Michael Gericke, S. Wells, S. Kowalski, J. Balewski, W. S. Duvall, J. Leckey, R. T. Jones, A. Mkrtchyan, M. H. Shabestari, J. W. Martin, Nuruzzaman, M. Elaasar, C. A. Davis, L. Z. Ndukum, B. Sawatzky, M. Kargiantoulakis, J. Grames, J. A. Magee, Roger Carlini, S. K. Phillips, P. Solvignon, G. D. Cates, S. Yang, Jongmin Lee, D. C. Jones, J. Diefenbach, N. Morgan, Wouter Deconinck, W. T. H. van Oers, Darko Androić, R. Michaels, V. M. Gray, A. R. Lee, B. Waidyawansa, S. MacEwan, T. Seva, E. Korkmaz, Jay Benesch, V. Tvaskis, J. Beaufait, R. Subedi, A. Asaturyan, R. Suleiman, S. Zhamkochyan, K. E. Myers, H. Mkrtchyan, D. S. Armstrong, G. R. Smith, J. A. Dunne, P. Wang, L. Lee, Dipangkar Dutta, K. Grimm, A. Subedi, S. Covrig, M. J. McHugh, Michael Pitt, Neven Simicevic, J. M. Finn, J. R. Hoskins, J. Roche, J. Birchall, T. A. Forest, Juliette Mammei, A. Micherdzinska, V. Tadevosyan, M. K. Jones, R. Silwal, Amrendra Narayan, M. Poelker, D. Gaskell, R. S. Beminiwattha, Ross D. Young, and J. F. Dowd
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, business.industry, Scattering, media_common.quotation_subject, Momentum transfer, Tracking system, Parity (physics), Kinematics, Electron, Condensed Matter Physics, 01 natural sciences, Asymmetry, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas, Nuclear physics, q-weak experiment, 0103 physical sciences, Physical and Theoretical Chemistry, 010306 general physics, business, Nuclear Experiment, media_common
Abstract: The Q-weak experiment at Jefferson Laboratory measured the parity violating asymmetry (A P V ) in elastic electron-proton scattering at small momentum transfer squared (Q 2=0.025 (G e V/c)2), with the aim of extracting the proton’s weak charge ( ${Q^p_W}$ ) to an accuracy of 5 %. As one of the major uncertainty contribution sources to ${Q^p_W}$ , Q 2 needs to be determined to ∼1 % so as to reach the proposed experimental precision. For this purpose, two sets of high resolution tracking chambers were employed in the experiment, to measure tracks before and after the magnetic spectrometer. Data collected by the tracking system were then reconstructed with dedicated software into individual electron trajectories for experimental kinematics determination. The Q-weak kinematics and the analysis scheme for tracking data are briefly described here. The sources that contribute to the uncertainty of Q 2 are discussed, and the current analysis status is reported.
Published: 2016

15. Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Author: P. M. King, G. D. Cates, Dipangkar Dutta, M. M. Dalton, W. D. Ramsay, M. McDonald, B. S. Cavness, A. Tobias, S. Kowalski, L. Lee, Wouter Deconinck, H. Mkrtchyan, B. Waidyawansa, J. C. Cornejo, Vladimir Nelyubin, S. A. Page, Kent Paschke, R. W. L. Jones, S. Zhamkotchyan, Jonathan W. Martin, Douglas Storey, P. Solvignon, G. Hays, Amber McCreary, Jay Benesch, P. Wang, L. A. Dillon-Townes, A. Asaturyan, E. Ihloff, V. Tvaskis, A. Mkrtchyan, Erik Urban, D. C. Jones, C. Vidal, A. Micherdzinska, Leonid Kurchaninov, Amrendra Narayan, D. Gaskell, Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Ihloff, Ernest E., Kowalski, Stanley B., and Vidal, Christopher J.
Subjects: Physics, 010308 nuclear & particles physics, business.industry, Scattering, QC1-999, Compton scattering, Polarimetry, General Physics and Astronomy, Diamond, Electron, engineering.material, 01 natural sciences, Particle detector, Optics, Deflection (physics), 0103 physical sciences, Cathode ray, engineering, Physics::Accelerator Physics, 010306 general physics, business
Abstract: We report on the highest precision yet achieved in the measurement of the polarization of a low-energy, O(1 GeV), continuous-wave (CW) electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond microstrip detector that was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector, and its large acceptance. The polarization of the 180-μA, 1.16-GeV electron beam was measured with a statistical precision of, United States. Dept. of Energy (Contract AC05-06OR23177), National Science Foundation (U.S.), Natural Sciences and Engineering Research Council of Canada
Published: 2015

16. Simple modification of Compton polarimeter to redirect synchrotron radiation

Author: Kent Paschke, Jay Benesch, B. P. Quinn, and G. B. Franklin
Subjects: Physics, Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), business.industry, Orders of magnitude (temperature), FOS: Physical sciences, Synchrotron radiation, Particle accelerator, Polarimeter, Surfaces and Interfaces, 20399 Classical Physics not elsewhere classified, Linear particle accelerator, law.invention, Dipole, Optics, law, Physics::Accelerator Physics, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Chicane, business, Beam (structure)
Abstract: Synchrotron radiation produced as an electron beam passes through a bending magnet is a significant source of background in many experiments. Using modeling, we show that simple modifications of the magnet geometry can reduce this background by orders of magnitude in some circumstances. Specifically, we examine possible modifications of the four dipole magnets used in Jefferson Lab’s Hall A Compton polarimeter chicane. This Compton polarimeter has been a crucial part of experiments with polarized beams and the next generation of experiments will utilize increased beam energies, up to 11 GeV, requiring a corresponding increase in Compton dipole field to 1.5 T. In consequence, the synchrotron radiation (SR) from the dipole chicane will be greatly increased. Three possible modifications of the chicane dipoles are studied; each design moves about 2% of the integrated bending field to provide a gentle bend in critical regions along the beam trajectory which, in turn, greatly reduces the synchrotron radiation within the acceptance of the Compton polarimeter photon detector. Each of the modifications studied also softens the SR energy spectrum at the detector sufficiently to allow shielding with 5 mm of lead. Simulations show that these designs are each capable of reducing the background signal duemore » to SR by three orders of magnitude. The three designs considered vary in their need for vacuum vessel changes and in their effectiveness.« less
Published: 2015

17. The Qweak experimental apparatus

Author: J. R. Hoskins, R. S. Beminiwattha, J. Birchall, J. Diefenbach, Juliette Mammei, J. Balewski, Erik Urban, J. F. Dowd, K. Johnston, G. Clark, P.W. Rose, B. Sawatzky, P. Solvignon, M. Kargiantoulakis, M. Elaasar, J. Mei, S. Sobczynski, A. Micherdzinska, A. Kubera, M. K. Jones, R.B. Zielinski, Mitchell D. Anderson, T. Averett, R. Suleiman, V. M. Gray, E. Henderson, R.D. Carlini, S. A. Wood, Neven Simicevic, J. D. Bowman, A. Mkrtchyan, Amber McCreary, Darko Androić, V. Tvaskis, E. Bonnell, N. Morgan, R. Mahurin, Kent Paschke, R. Averill, J. Beaufait, J. Roche, S. Zhamkochyan, D. J. Mack, C. A. Davis, Fatiha Benmokhtar, S. A. Page, D.C. Dean, J. M. Finn, P. Medeiros, Jean-Francois Rajotte, R. Subedi, G. D. Cates, S. Wells, F. Guo, S. MacEwan, P. Wang, J. A. Dunne, Jongmin Lee, T. Seva, E. Korkmaz, S. K. Phillips, D. C. Jones, P. Brindza, Amrendra Narayan, M. Poelker, J. Pan, J. Leacock, A. R. Lee, V. Tadevosyan, D. Gaskell, Y. Liang, R. Michaels, M. M. Dalton, D.J. Harrison, A.K. Opper, J. Grames, M. McDonald, S. Kowalski, J.C. Cornejo, W. S. Duvall, W. D. Ramsay, A. Asaturyan, J. Leckey, K. Grimm, J. W. Martin, B. Stokes, P. M. King, Michael Gericke, K. E. Mesick, H. Mkrtchyan, E. Ihloff, J. A. Magee, Nadeem A. Khan, L. Lee, J. Kelsey, Trent Allison, Jay Benesch, S. Yang, D. T. Spayde, B. Waidyawansa, D.B. Brown, S. Covrig Dusa, Dipangkar Dutta, W. R. Falk, R. Silwal, A. Subedi, Vladimir Nelyubin, J. Bessuille, D. G. Meekins, R. T. Jones, J. Hansknecht, Nuruzzaman, W. T. H. van Oers, K.D. Finelli, Michael Pitt, J.R. Echols, D. S. Armstrong, G. R. Smith, Douglas Storey, M. J. McHugh, M. H. Shabestari, J. Musson, K. A. Dow, L. Z. Ndukum, Wouter Deconinck, W.R. Roberts, William A. Tobias, and B. S. Cavness
Subjects: Physics, Nuclear and High Energy Physics, business.industry, Compton scattering, Collimator, Electron, Helicity, law.invention, Nuclear physics, Optics, Beamline, law, Scintillation counter, Cathode ray, Physics::Accelerator Physics, Parity violation, Electron scattering, Liquid hydrogen target, business, Instrumentation, Cherenkov radiation
Abstract: The Jefferson Lab Q weak 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 → p 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 μA 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. Moller 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° and 11.6° 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 GeV 2 was determined using dedicated low-current ( ~ 100 pA ) measurements with a set of drift chambers before (and a set of drift chambers and trigger scintillation counters after) the toroidal magnet.
Published: 2015

18. Qweak: First Direct Measurement of the Proton’s Weak Charge

Author: J. R. Hoskins, V. Tadevosyan, J. Diefenbach, K. Johnston, J. Birchall, S.A. Page, D. S. Armstrong, M. J. McHugh, J. Mei, H. Nuhait, C. A. Davis, M. Elaasar, Juliette Mammei, T. Averett, Wouter Deconinck, J. A. Magee, P. Wang, S. Yang, G.R. Smith, W. R. Falk, P. Zang, H. Mkrtchyan, W. T. H. van Oers, D. G. Meekins, J. Pan, F. Guo, J. Roche, Vladimir Nelyubin, W.D. Ramsay, J. Beaufait, B. Sawatzky, Fatiha Benmokhtar, M.L. Pitt, D. C. Jones, N. Morgan, R. Suleiman, N. Simicevic, V. Tvaskis, R. Michaels, Michael Gericke, B. Waidyawansa, Roger Carlini, J. Leckey, T. A. Forest, R. T. Jones, Jay Benesch, J. M. Finn, J. Balewski, M. M. Dalton, J. Grames, L. Lee, Jean-Francois Rajotte, Dipangkar Dutta, S. Kowalski, L. Z. Ndukum, W. S. Duvall, D. J. Mack, J. W. Martin, A.K. Opper, M. Kargiantoulakis, S.A. Wood, T. Seva, P. Solvignon, G. D. Cates, V. M. Gray, Jongmin Lee, K. Grimm, S. Covrig, A. R. Lee, J. Leacock, R. Mahurin, D.T. Spayde, R. Silwal, A. Mkrtchyan, S.K. Phillips, A. Asaturyan, S. Zhamkochyan, S. MacEwan, E. Korkmaz, J.C. Cornejo, K. E. Myers, P. M. King, K. Bartlett, Darko Androić, A. Subedi, J. A. Dunne, Amrendra Narayan, R. Subedi, D. Gaskell, K.D. Paschke, A. Micherdzinska, M.H. Shabestari, M. K. Jones, W.A. Tobias, C. Gal, R. S. Beminiwattha, M. Poelker, Ross D. Young, J. F. Dowd, and S.P. Wells
Subjects: Physics, Particle physics, Proton, 010308 nuclear & particles physics, QC1-999, media_common.quotation_subject, Hadron, Charge (physics), Elementary particle, 7. Clean energy, 01 natural sciences, Asymmetry, Standard Model, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Grand Unified Theory, Nuclear Experiment, 010306 general physics, Nucleon, media_common
Abstract: The Q weak experiment, which took data at Jefferson Lab in the period 2010 - 2012, will precisely determine the weak charge of the proton by measuring the parity-violating asymmetry in elastic e-p scattering at 1.1 GeV using a longitudinally polarized electron beam and a liquid hydrogen target at a low momentum transfer of Q 2 = 0.025 (GeV/c)2 . The weak charge of the proton is predicted by the Standard Model and any significant deviation would indicate physics beyond the Standard Model. The technical challenges and experimental apparatus for measuring the weak charge of the proton will be discussed, as well as the method of extracting the weak charge of the proton. The results from a small subset of the data, that has been published, will also be presented. Furthermore an update will be given of the current status of the data analysis.
Published: 2017

19. Simultaneous optimization of the cavity heat load and trip rates in linacs using a genetic algorithm

Author: Cody Reeves, Desh Ranjan, Sabbir Ahmed Khan, A. P. Freyberger, Balsa Terzic, Jay Benesch, Geoffrey Krafft, and Alicia Hofler
Subjects: Physics, Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Energy management, Particle accelerator, Surfaces and Interfaces, 01 natural sciences, Linear particle accelerator, law.invention, law, Proof of concept, 0103 physical sciences, Genetic algorithm, Electronic engineering, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Radio frequency, Simultaneous optimization, Heat load, 010306 general physics
Abstract: In this paper, a genetic algorithm-based optimization is used to simultaneously minimize two competing objectives guiding the operation of the Jefferson Lab's Continuous Electron Beam Accelerator Facility linacs: cavity heat load and radio frequency cavity trip rates. The results represent a significant improvement to the standard linac energy management tool and thereby could lead to a more efficient Continuous Electron Beam Accelerator Facility configuration. This study also serves as a proof of principle of how a genetic algorithm can be used for optimizing other linac-based machines.
Published: 2014

20. Primary Beam Steering Due to Field Leakage from Superconducting SHMS Magnets

Author: B. Waidyawansa, Michael H. Moore, Silviu Covrig, Roger Carlini, and Jay Benesch
Subjects: Physics, Accelerator Physics (physics.acc-ph), Spectrometer, business.industry, Beam steering, FOS: Physical sciences, law.invention, Magnetic field, Optics, Beamline, law, Magnet, Electromagnetic shielding, Physics::Accelerator Physics, Physics - Accelerator Physics, Beam dump, Nuclear Experiment (nucl-ex), business, Instrumentation, Nuclear Experiment, Mathematical Physics, Leakage (electronics)
Abstract: Simulations of the magnetic fields from the Super High Momentum Spectrometer in Hall C at Thomas Jefferson National Accelerator Facility show significant field leakage into the region of the primary beam line between the target and the beam dump. Without mitigation, these remnant fields will steer the unscattered beam enough to limit beam operations at small scattering angles. Presented here are magnetic field simulations of the spectrometer magnets and a solution using optimal placement of a minimal amount of shielding iron around the beam line., Corrected two typos, JIST class
Published: 2014

21. Early Results from the Qweak Experiment

Author: J. Beaufait, H. Mkrtchyan, J. Roche, J. A. Dunne, Jean-Francois Rajotte, Kathryn Grimm, S. K. Phillips, J. Diefenbach, S. Covrig, S. MacEwan, T. Seva, E. Korkmaz, D. G. Meekins, Matthew Jones, M. M. Dalton, T. Averett, D. C. Jones, Kent Paschke, R. W. L. Jones, Fatiha Benmokhtar, J. A. Magee, R. Michaels, P. M. King, W. D. Ramsay, R. S. Beminiwattha, M. H. Shabestari, Wouter Deconinck, V. Tadevosyan, A. Asaturyan, R. D. Carlini, S. Kowalski, W. S. Duvall, Jay Benesch, F. Guo, J. Birchall, A. Micherdzinska, Joseph Grames, Ross D. Young, J. W. Martin, B. Waidyawansa, J. F. Dowd, Michael Pitt, S. Yang, Geoffrey Smith, S. A. Page, V. M. Gray, M. Poelker, Nuruzzaman, R. Silwal, G. D. Cates, P. Wang, S. P. Wells, T. A. Forest, Jongmin Lee, Dipangkar Dutta, K. Johnston, A. R. Lee, J. Leacock, B. Sawatzky, M. Elaasar, J. Mei, D. S. Armstrong, Riad Suleiman, A. Subedi, S. A. Wood, R. Mahurin, Amrendra Narayan, L. Lee, J. Balewski, P. Solvignon, D. J. Mack, R. Subedi, John M. Finn, W. R. Falk, M. Kargiantoulakis, N. Morgan, L. Z. Ndukum, Vladimir Nelyubin, M. J. McHugh, Neven Simicevic, W. T. H. van Oers, C. A. Davis, William A. Tobias, D. Gaskel, Michael Gericke, J. C. Cornejo, J. R. Hoskins, J. Pan, Darko Androić, Juliette Mammei, S. Zhamkochyan, J. Leckey, D. T. Spayde, A. K. Opper, K. E. Myers, V. Tvaskis, and A. Mkrtchyan
Subjects: Physics, Quark, Scattering, media_common.quotation_subject, Physics beyond the Standard Model, QC1-999, FOS: Physical sciences, Electron, Measure (mathematics), Asymmetry, Nuclear physics, Neutron, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam (structure), media_common
Abstract: A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic ep scattering to provide the first determination of the protons weak charge Qweak(p). The experiment employed a 180 uA longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q2 of 0.025 GeV2 were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Qweak(p) to 4.2 percent (combined statistical and systematic error), which implies a measure of sin2(thetaw) at the level of 0.3 percent, and to help constrain the vector weak quark charges C1u and C1d. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH2 target. The new constraints on C1u and C1d provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron., Comment: 8 pages, 4 figures, INPC2013
Published: 2014

22. Measurement of the Parity-Violating Asymmetry in Electron-Deuteron Scattering in the Nucleon Resonance Region

Author: M. Friend, B. P. Quinn, S. Frullani, K. Hafidi, J. G. Rubin, A. V. Glamazdin, P. E. Reimer, E. Cisbani, Douglas Higinbotham, S. Kowalski, D. McNulty, Arijit Saha, Nilanga Liyanage, Bogdan Wojtsekhowski, J. P. Chen, C. E. Hyde, B. Zhao, A. Deur, Paul Souder, Vladimir Nelyubin, Nuruzzaman, A. Shahinyan, X. Zheng, E. Long, D. S. Armstrong, Wouter Deconinck, J. Huang, K. Pan, G. M. Urciuoli, K. E. Myers, G. D. Cates, Jongmin Lee, Kent Paschke, A. Giusa, Olfred Hansen, G.V. Russo, John Arrington, K. S. Kumar, A. Camsonne, S. Golge, R. Subedi, R. S. Beminiwattha, Abdurahim Rakhman, Diana Parno, G. B. Franklin, Vincent Sulkosky, Fatiha Benmokhtar, S. K. Nanda, Yujie Qiang, B. Sawatzky, D. Wang, N. Muangma, S. K. Phillips, Z. Ahmed, R. Silwal, Young Do Oh, R. J. Holt, M. M. Dalton, J. J. LeRose, B. Waidyawansa, Xin Qian, R. Holmes, M. Mihovilovic, S. Riordan, L. Mercado, P. M. King, Franco Meddi, Z. E. Meziani, Jay Benesch, Kiadtisak Saenboonruang, D. G. Meekins, H. Kang, C. M. Sutera, X. Deng, D. Flay, K. Rider, Mustafa Canan, Kalyan Allada, C. W. de Jager, K. A. Aniol, C. M. Jen, L. El Fassi, C. Dutta, R. De Leo, William A. Tobias, D. C. Jones, E. Chudakov, R. Michaels, Amrendra Narayan, T. Holmstrom, J. Roche, V. Bellini, Simon Širca, F. Garibaldi, R. Suleiman, K. Grimm, D. J. Margaziotis, and L. Ye
Subjects: Physics, Quark, Particle physics, Scattering, media_common.quotation_subject, Nuclear Theory, Electroweak interaction, Hadron, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Inelastic scattering, Asymmetry, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Electron scattering, media_common
Abstract: We report on parity-violating asymmetries in the nucleon resonance region measured using $5 - 6$ GeV longitudinally polarized electrons scattering off an unpolarized deuterium target. These results are the first parity-violating asymmetry data in the resonance region beyond the $\Delta(1232)$, and provide a verification of quark-hadron duality in the nucleon electroweak $\gamma Z$ interference structure functions at the (10-15)% level. The results are of particular interest to models relevant for calculating the $\gamma Z$ box-diagram corrections to elastic parity-violating electron scattering measurements., Comment: 7 pages, 1 figure, to appear in Phys. Rev. Lett
Published: 2013
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23. New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei

Author: P. M. King, H. Yao, H. Albataineh, B. Craver, William A. Tobias, J. Leckey, A. Kolarkar, Jie Zhang, Kiadtisak Saenboonruang, S. Frullani, B. Waidyawansa, P. Y. Bertin, J. P. Chen, M. L. Sperduto, E. Kuchina, Jaideep Singh, K. de Jager, M. Friend, B. Reitz, J. Barber, K. Otis, Charles Horowitz, Yiyang Zhang, J. Huang, G. M. Urciuoli, C. M. Jen, A. Barbieri, M. M. Dalton, Young Do Oh, C. M. Sutera, S. K. Nanda, Yujie Qiang, E. Cisbani, Eric L. N. Jensen, D. Neyret, A. J. R. Puckett, G. B. Franklin, Joseph M. Katich, M. Poelker, D. J. Margaziotis, R. Holmes, N. Muangma, S. K. Phillips, B. P. Quinn, A. Etile, J. Roche, Wouter Deconinck, V. Yim, S. Riordan, D. Deepa, T. Bielarski, D. Lhuillier, G.V. Russo, K. Grimm, E. Fuchey, R. Michaels, Douglas Higinbotham, R. A. Lindgren, J. J. LeRose, S. Kowalski, V. Bellini, F. Itard, R. Subedi, S. Johnston, A. Palmer, A. Beck, T. Averett, F. Mammoliti, M. Mihovilovic, A. Shahinyan, J. M. Finn, M. Stutzman, D. S. Armstrong, J. Wexler, Z. Ahmed, L. Zana, E. Voutier, C. E. Hyde, E. Burtin, Guy Ron, E. Gasser, X. Zhan, F. Cusanno, F. Butaru, Pete Markowitz, P. E. Reimer, K. Wang, Lindsay Glesener, P. Carter, M. Posik, S. Abrahamyan, P. Monaghan, Peter S. LaViolette, B. Babineau, Simon Širca, A. Giusa, John Arrington, X. Yan, F. Garibaldi, Nilanga Liyanage, L. Lagamba, Kent Paschke, Olfred Hansen, T. Holmstrom, S. Fuchs, D. Flay, M. Mazouz, Richard Wilson, R. Suleiman, V. Ziskin, J. Leacock, Fatiha Benmokhtar, P. Solvignon, Mustafa Canan, Amber McCreary, J. R. Hoskins, R. De Leo, A. V. Glamazdin, Antonin Vacheret, A. Acha, L. Mercado, Seonho Choi, R. S. Beminiwattha, Paul Souder, Diana Parno, R. Snyder, D. Lambert, Whitney Armstrong, X. Deng, Z. E. Meziani, S. L. Bailey, N. Lubinsky, G. D. Cates, J. Gomez, D. Wang, Juliette Mammei, C. Muñoz-Camacho, K. A. Aniol, Jongmin Lee, P. Bosted, Bryan J. Moffit, B. Sawatzky, R. J. Feuerbach, R. I. Pomatsalyuk, A. Deur, D. McNulty, Arijit Saha, Ronald Gilman, A. Whitbeck, X. Jiang, Jay Benesch, J. Hansknecht, C. Gu, Z. Ye, Bogdan Wojtsekhowski, Xin Qian, Vladimir Nelyubin, Andrei Afanasev, C. Ferdi, K. Kliakhandler, D. G. Meekins, H. Benaoum, H. F. Ibrahim, W. Troth, K. Prok, A. Camsonne, Ping Zhu, L. J. Kaufman, Chunhui Chen, Vincent Sulkosky, J. Cahoon, K. Fuoti, Dipangkar Dutta, Nuruzzaman, T. B. Humensky, P. Decowski, P. E. Ulmer, Y. C. Chao, K. McCormick, A. Kelleher, G. Jin, Abdurahim Rakhman, R. Silwal, Y. X. Ye, X. Zheng, J. Grames, Mikhail Gorchtein, C. C. Chang, K. S. Kumar, W. U. Boeglin, P. Rogan, E. Chudakov, M. Potokar, Or Hen, Karl Slifer, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HAPPEX, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Elastic scattering, Physics, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, FOS: Physical sciences, General Physics and Astronomy, Elastic electron, chemistry.chemical_element, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Amplitude, chemistry, Excited state, 0103 physical sciences, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment, Helium, media_common
Abstract: We have measured the beam-normal single-spin asymmetry $A_n$ in the elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for the first time from $^4$He, $^{12}$C, and $^{208}$Pb. For $^1$H, $^4$He and $^{12}$C, the measurements are in agreement with calculations that relate $A_n$ to the imaginary part of the two-photon exchange amplitude including inelastic intermediate states. Surprisingly, the $^{208}$Pb result is significantly smaller than the corresponding prediction using the same formalism. These results suggest that a systematic set of new $A_n$ measurements might emerge as a new and sensitive probe of the structure of heavy nuclei., 5 pages, 3 figures, accepted by PRL. v3: fixed one author name and affiliation, otherwise no change
Published: 2012

24. Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction ofπ−near theΔ0Resonance

Author: V. Tadevosyan, M. Stutzman, M. K. Jones, R. Suleiman, J. Hansknecht, G. Guillard, Fatiha Benmokhtar, Darko Androić, S. Kox, W. D. Ramsay, Michael Pitt, W. T. H. van Oers, J. Roche, T. Horn, A. Micherdzinska, S. L. Bailey, E. Voutier, D. T. Spayde, H. Breuer, P. Bosted, Douglas H Beck, G. Flores, Christophe Furget, Michael Gericke, S. Wells, R. D. McKeown, Neven Simicevic, M. Muether, M. Poelker, E. J. Beise, Y. C. Chao, D. Gaskell, A. Coppens, M. Versteegen, J. Grames, B. P. Quinn, D. S. Armstrong, G. R. Smith, M. Mihovilovic, Junyu Liu, C. L. Capuano, L. Bimbot, S. E. Williamson, J. Birchall, S. K. Phillips, Wolfgang Korsch, Juliette Mammei, S. A. Wood, P. M. King, J. Arvieux, S. F. Pate, H. Mkrtchyan, C. Ellis, S. A. Page, P. G. Roos, P. Pillot, G. B. Franklin, W. F. Vulcan, T. Seva, J. Schaub, L. Lee, V. Papavassiliou, J. W. Martin, Jay Benesch, J. S. Real, C. A. Davis, and A. Lung
Subjects: Physics, Particle physics, Chiral perturbation theory, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Hyperon, General Physics and Astronomy, Inelastic scattering, 01 natural sciences, Asymmetry, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering, media_common
Abstract: The parity-violating (PV) asymmetry of inclusive π- production in electron scattering from a liquid deuterium target was measured at backward angles. The measurement was conducted as a part of the G0 experiment, at a beam energy of 360 MeV. The physics process dominating pion production for these kinematics is quasifree photoproduction off the neutron via the Δ^0 resonance. In the context of heavy-baryon chiral perturbation theory, this asymmetry is related to a low-energy constant d_Δ^- that characterizes the parity-violating γNΔ coupling. Zhu et al. calculated d_Δ^- in a model benchmarked by the large asymmetries seen in hyperon weak radiative decays, and predicted potentially large asymmetries for this process, ranging from A_γ^-=-5.2 to +5.2 ppm. The measurement performed in this work leads to A_γ^-=-0.36±1.06±0.37±0.03 ppm (where sources of statistical, systematic and theoretical uncertainties are included), which would disfavor enchancements considered by Zhu et al. proportional to V_(ud)/V_(us). The measurement is part of a program of inelastic scattering measurements that were conducted by the G0 experiment, seeking to determine the N-Δ axial transition form factors using PV electron scattering.
Published: 2012

25. Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering

Author: Marc Vanderhaeghen, J. Roche, M. K. Jones, Jay Benesch, J. Hansknecht, A. Lung, J. W. Martin, H. Breuer, W. F. Vulcan, Christophe Furget, S. F. Pate, H. Mkrtchyan, G. Flores, Michael Gericke, R. Suleiman, Darko Androić, S. Kox, G. Guillard, T. Seva, M. Stutzman, S. A. Page, J. Schaub, L. Lee, Douglas H Beck, Fatiha Benmokhtar, M. Muether, V. Papavassiliou, S. Wells, C. L. Capuano, T. Horn, R. D. McKeown, W. D. Ramsay, W. T. H. van Oers, P. Bosted, S. A. Wood, E. Voutier, D. T. Spayde, J. S. Real, M. Poelker, G. B. Franklin, C. A. Davis, D. Gaskell, B. Pasquini, P. M. King, B. P. Quinn, L. Bimbot, S. E. Williamson, Neven Simicevic, Y. C. Chao, Wolfgang Korsch, J. Birchall, Juliette Mammei, P. G. Roos, J. Grames, C. Ellis, M. Versteegen, S. K. Phillips, J. Arvieux, A. Micherdzinska, D. S. Armstrong, G. R. Smith, M. Mihovilovič, E. J. Beise, V. Tadevosyan, A. Coppens, Michael Pitt, S. L. Bailey, Junyu Liu, P. Pillot, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and G0
Subjects: Nuclear Theory, General Physics and Astronomy, axial-vector current, FOS: Physical sciences, Inelastic scattering, Mott scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], strange quark, 01 natural sciences, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology (hep-ph), parity-violating asymmetries, charge and magnetic nucleon form factors, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Elastic scattering, Physics, Quasielastic scattering, 010308 nuclear & particles physics, Scattering, Small-angle neutron scattering, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, High Energy Physics - Phenomenology, Quasielastic neutron scattering, Physics::Accelerator Physics, High Energy Physics::Experiment, Scattering theory, Atomic physics
Abstract: We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.
Published: 2011

26. The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles

Author: T. Horn, G. A. Rutledge, R. M. Laszewski, A. Kolarkar, R. Hasty, F. Merchez, E. Liatard, K. Grimm, W. F. Vulcan, J. Yun, H. C. Fenker, R. Carr, R. Suleiman, D. McKee, J. Roche, R. Neveling, K. Johnston, M. Versteegen, Raphael Noel Tieulent, A. Coppens, R. Frascaria, S. A. Wood, T. Averett, P. Pillot, S. Kox, D. Marchand, D. S. Armstrong, K. A. Griffioen, G. R. Smith, C. Yan, G. Guillard, J. Lachniet, E. Voutier, K. W. McFarlane, G. Quéméner, J. Schaub, L. Lee, D. S. Dale, Michael Gericke, A. Hawthorne Allen, Fatiha Benmokhtar, V. Zeps, E. J. Beise, M. Muether, R. Clark, D. J. Mack, Michael Pitt, Jay Benesch, Jonathan W. Martin, W. T. H. van Oers, T. A. Porcelli, J. A. Secrest, W. D. Ramsay, A. A. Cowley, S. Niccolai, H. Guler, C. L. Capuano, S. L. Bailey, J. Arvieux, N. S. Chant, L. Bimbot, P. Kammel, C. Ellis, Bryan J. Moffit, R. Asaturyan, G. Batigne, D. T. Spayde, W. R. Falk, P. M. King, Douglas H Beck, A. Micherdzinska, Takeyasu Ito, John Musson, R. D. McKeown, S. A. Page, S. Wells, J. Kuhn, Y. C. Chao, K. Nakahara, B. Guillon, S. E. Williamson, J. Grames, L. Hannelius, M. Morlet, H. Breuer, J. Van de Wiele, S. K. Phillips, J. Hansknecht, J. S. Real, A. S. Biselli, R. J. Woo, S. Covrig, M. K. Jones, J. Lenoble, S. Ong, H. Mkrtchyan, M. Poelker, D. Gaskell, S.G. Stepanyan, T. A. Forest, C. A. Davis, A. Lung, J. M. Finn, M. Stutzman, S. F. Pate, T. Seva, E. Korkmaz, A. W. Rauf, V. Papavassiliou, P. Brindza, G. A. MacLachlan, V. Tadevosyan, J. Birchall, R. Kazimi, C. Furget, Juliette Mammei, Glen A. Warren, Neven Simicevic, P. G. Roos, D. Nilsson, G. B. Franklin, K. Gustafsson, Wolfgang Korsch, Darko Androić, M. Mihovilovic, Jin Liu, P. Bosted, R. D. Carlini, T. Ries, B. P. Quinn, Mines Nantes (Mines Nantes), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and G0
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Electron, Mott scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, magnetic spectrometer, liquid hydrogen target, polarized electron beam, parity-violation, electron scattering, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Cherenkov radiation, Elastic scattering, Physics, Spectrometer, 010308 nuclear & particles physics, Scattering, Instrumentation and Detectors (physics.ins-det), Small-angle neutron scattering, Electron scattering
Abstract: In the G0 experiment, performed at Jefferson Lab, the parity-violating elastic scattering of electrons from protons and quasi-elastic scattering from deuterons is measured in order to determine the neutral weak currents of the nucleon. Asymmetries as small as 1 part per million in the scattering of a polarized electron beam are determined using a dedicated apparatus. It consists of specialized beam-monitoring and control systems, a cryogenic hydrogen (or deuterium) target, and a superconducting, toroidal magnetic spectrometer equipped with plastic scintillation and aerogel Cerenkov detectors, as well as fast readout electronics for the measurement of individual events. The overall design and performance of this experimental system is discussed., Comment: Submitted to Nuclear Instruments and Methods
Published: 2011

27. Recent results from the G0 experiment

Author: Douglas H Beck, R. D. McKeown, C. L. Capuano, M. Mihovilovic, M. Versteegen, S. Kox, Joseph Grames, W. D. Ramsay, C. Furget, G. Guillard, A. Coppens, J. Schaub, L. Lee, D. T. Spayde, G. Flores, S. A. Page, Junyu Liu, Michael Gericke, P. M. King, C. Ellis, F. Benmokhtar, E. Voutier, P. G. Roos, E. J. Beise, W. T. H. van Oers, L. Bimbot, V. Tadevosyan, J. S. Real, H. Breuer, S. F. Pate, H. Mkrtchyan, Jay Benesch, S. E. Williamson, S. K. Phillips, J. Roche, S. A. Wood, J. Hansknecht, T. Seva, M. Muether, V. Papavassiliou, S. Wells, W. F. Vulcan, T. Horn, Y. C. Chao, C. A. Davis, J. W. Martin, B. P. Quinn, M. Poelker, Neven Simicevic, D. Gaskell, M. K. Jones, Wolfgang Korsch, A. Micherdzinska, Darko Androić, A. Lung, P. Bosted, R. Suleiman, J. Arvieux, P. Pillot, M. Stutzman, J. Birchall, Juliette Mammei, G. B. Franklin, Michael Pitt, S. L. Bailey, D. S. Armstrong, G. R. Smith, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and G0
Subjects: Physics, Quark, Particle physics, Strange quark, Scattering, QC1-999, Momentum transfer, Nuclear Theory, Electron, Weak interaction, 7. Clean energy, Nuclear physics, Dipole, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nucleon, Nuclear Experiment
Abstract: We have measured parity violating asymmetries in elastic electron-proton and quasi-elastic electrondeuteron scattering at backward electron angle. These measurements have been done at two momentum transfers : Q2 = 0.22 and 0.63 (GeV/c)2 . Together with our previous forward angle measurement [1], we can extract strange quark contributions to the electromagnetic form factors of the nucleon, as well as nucleon axial form factor coming from the neutral weak interaction. The results indicate a strange quark magnetic contribution close to zero at these Q2 , and a possible non zero strange quark electric contribution for the high Q2 . The ﬁrst Q2 behavior measurement of the nucleon axial form factor in elastic electron scattering shows a good agreement with radiative corrections calculated at Q2 = 0 and with a dipole form using the axial mass determined in neutrino scattering.
Published: 2010

28. Beam Physics for the 12 GeV Cebaf Upgrade Project

Author: M. Spata, M. Wiseman, Y. Chao, M. Tiefenback, G.A. Krafft, L. Merminga, A. Bogacz, A. Freyberger, R. Kazimi, Jay Benesch, Y. Zhang, B.C. Yunn, L. Harwood, and J. M. Grames
Subjects: Physics, Synchrotron radiation, Optical polarization, Injector, Polarization (waves), Linear particle accelerator, law.invention, Nuclear physics, Upgrade, law, Electron optics, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, Beam (structure)
Abstract: Beam physics aspects of the 12 GeV Upgrade of CEBAF are presented. The CEBAF Upgrade to 12 GeV is achieved via 5.5 recirculations through the linacs, and the installation of 10 new high-gradient cryomodules. A new experimental hall, Hall D, is envisioned at the end of the North Linac. Simulation results for a straight-ahead and a recirculated injector are summarized and compared. Beam transport designs are discussed and evaluated with respect to matching and beam breakup (BBU) optimization. Effects of synchrotron radiation excitation on the beam properties are calculated. BBU simulations and derived specifications for the damping of higher order modes of the new 7-cell cavities are presented. The energies that provide longitudinal polarization in multiple experimental halls simultaneously are calculated. Finally, detailed optics of the Hall D transport line has been obtained.
Published: 2006

29. Dark Sectors 2016 Workshop: Community Report

Author: Jim Alexander, Jim, Alexander, Marco, Battaglieri, Bertrand, Echenard, Rouven, Essig, Matthew, Graham, Eder, Izaguirre, John, Jaros, Gordan, Krnjaic, Jeremy, Mardon, David, Morrissey, Tim, Nelson, Maxim, Perelstein, Matt, Pyle, Adam, Ritz, Philip, Schuster, Brian, Shuve, Natalia, Toro, Richard, G. Water, Daniel, Akerib, Haipeng, An, Konrad, Aniol, Arnquist, Isaac J., Asner, David M., Back, Henning O., Keith, Baker, Nathan, Baltzell, Dipanwita, Banerjee, Brian, Batell, Daniel, Bauer, James, Beacham, Jay, Benesch, James, Bjorken, Nikita, Blinov, Celine, Boehm, Mariangela, Bondí, Walter, Bonivento, Fabio, Bossi, Brodsky, Stanley J., Ran, Budnik, Stephen, Bueltmann, Bukhari, Masroor H., Raymond, Bunker, Massimo, Carpinelli, Concetta, Cartaro, David, Cassel, Gianluca Cavoto, Andrea, Celentano, Animesh, Chaterjee, Saptarshi, Chaudhuri, Gabriele, Chiodini, Hsiao-Mei Sherry Cho, Church, Eric D., Cooke, D. A., Jodi, Cooley, Robert, Cooper, Ross, Corliss, Paolo, Crivelli, Francesca, Curciarello, Annalisa, D. Angelo, Hooman, Davoudiasl, Marzio De Napoli, Vita, Raffaella, Achim, Denig, Patrick, Deniverville, Abhay, Deshpande, Ranjan, Dharmapalan, Bogdan, Dobrescu, Sergey, Donskov, Raphael, Dupre, Juan, Estrada, Stuart, Fegan, Torben, Ferber, Clive, Field, Enectali, Figueroa-Feliciano, Alessandra, Filippi, Bartosz, Fornal, Arne, Freyberger, Alexander, Friedland, Iftach, Galon, Susan, Gardner, Francois-Xavier, Girod, Sergei, Gninenko, Andrey, Golutvin, Stefania, Gori, Christoph, Grab, Enrico, Graziani, Keith, Griffioen, Andrew, Haas, Keisuke, Harigaya, Christopher, Hearty, Scott, Hertel, Joanne, Hewett, Andrew, Hime, David, Hitlin, Yonit, Hochberg, Holt, Roy J., Maurik, Holtrop, Hoppe, Eric W., Hossbach, Todd W., Lauren, Hsu, Phil, Ilten, Joe, Incandela, Gianluca, Inguglia, Kent, Irwin, Igal, Jaegle, Johnson, Robert P., Yonatan, Kahn, Grzegorz, Kalicy, Zhong-Bo, Kang, Vardan, Khachatryan, Venelin, Kozhuharov, Krasnikov, N. V., Valery, Kubarovsky, Eric, Kuflik, Noah, Kurinsky, Ranjan, Laha, Gaia, Lanfranchi, Dale, Li, Tongyan, Lin, Mariangela, Lisanti, Kun, Liu, Ming, Liu, Ben, Loer, Dinesh, Loomba, Lyubovitskij, Valery E., Aaron, Manalaysay, Giuseppe, Mandaglio, Jeremiah, Mans, Marciano, W. J., Thomas, Markiewicz, Luca, Marsicano, Takashi, Maruyama, Matveev, Victor A., David, Mckeen, Bryan, Mckinnon, Dan, Mckinsey, Harald, Merkel, Jeremy, Mock, Maria Elena Monzani, Omar, Moreno, Corina, Nantais, Sebouh, Paul, Peskin, Michael Edward, Vladimir, Poliakov, Antonio Davide Polosa, Maxim, Pospelov, Igor, Rachek, Balint, Radics, Mauro Raggi, Nunzio, Randazzo, Blair, Ratcliff, Alessandro, Rizzo, Thomas, Rizzo, Alan, Robinson, Andre, Rubbia, David, Rubin, Dylan, Rueter, Tarek, Saab, Elena, Santopinto, Richard, Schnee, Jessie, Shelton, Gabriele, Simi, Ani, Simonyan, Valeria, Sipala, Oren, Slone, Elton, Smith, Daniel, Snowden-Ifft, Matthew, Solt, Peter, Sorensen, Yotam, Soreq, Stefania, Spagnolo, James, Spencer, Stepan, Stepanyan, Jan, Strube, Michael, Sullivan, Tadepalli, Arun S., Tim, Tait, Mauro, Taiuti, Philip, Tanedo, Rex, Tayloe, Jesse, Thaler, Tran, Nhan V., Sean, Tulin, Tully, Christopher G., Sho, Uemura, Maurizio, Ungaro, Paolo, Valente, Holly, Vance, Jerry, Vavra, Tomer, Volansky, Belina von Krosigk, Andrew, Whitbeck, Mike, Williams, Peter, Wittich, Bogdan, Wojtsekhowski, Wei, Xue, Jong Min Yoon, Hai-Bo, Yu, Jaehoon, Yu, Tien-Tien, Yu, Yue, Zhang, Yue, Zhao, Yiming, Zhong, and Kathryn, Zurek
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), High Energy Physics - Phenomenology, astro-ph.CO, High Energy Physics - Experiment, Nuclear Experiment, hep-ex, FOS: Physical sciences, hep-ph, nucl-ex, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Nuclear Experiment (nucl-ex), Astrophysics - Cosmology and Nongalactic Astrophysics, Particle Physics - Phenomenology
Abstract: This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years., 66 pages, 15 figures, 3 tables. Workshop website and agenda: http://www-conf.slac.stanford.edu/darksectors2016/ https://indico.cern.ch/event/507783/ Editors: J. Alexander, M. Battaglieri, B. Echenard, R. Essig, M. Graham, E. Izaguirre, J. Jaros, G. Krnjaic, J. Mardon, D. Morrissey, T. Nelson, M. Perelstein, M. Pyle, A. Ritz, P. Schuster, B. Shuve, N. Toro, R. Van De Water

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29 results on '"Jay, Benesch"'

1. Ce+BAF : Positron Beams at Jefferson Lab

2. Measurement of the beam-normal single-spin asymmetry for elastic electron scattering from C12 and Al27

3. Accurate Determination of the Neutron Skin Thickness of Pb208 through Parity-Violation in Electron Scattering

4. The GlueX beamline and detector

5. Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering

6. Compact −300 kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

7. A novel comparison of Møller and Compton electron-beam polarimeters

8. Precision Measurement of the Weak Charge of the Proton

9. Simultaneous optimization of the cavity heat load and trip rates in linacs using a genetic algorithm

10. Magnetized electron beam for the JLEIC re-circulator cooler ring

11. Measurement of parity violation in electron–quark scattering

12. The ${Q^{p}_{\rm Weak}}$ experiment

13. Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies

14. The tracking analysis in the Q-weak experiment

15. Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

16. Simple modification of Compton polarimeter to redirect synchrotron radiation

17. The Qweak experimental apparatus

18. Qweak: First Direct Measurement of the Proton’s Weak Charge

19. Simultaneous optimization of the cavity heat load and trip rates in linacs using a genetic algorithm

20. Primary Beam Steering Due to Field Leakage from Superconducting SHMS Magnets

21. Early Results from the Qweak Experiment

22. Measurement of the Parity-Violating Asymmetry in Electron-Deuteron Scattering in the Nucleon Resonance Region

23. New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei

24. Measurement of the Parity-Violating Asymmetry in Inclusive Electroproduction ofπ−near theΔ0Resonance

25. Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering

26. The G0 Experiment: Apparatus for Parity-Violating Electron Scattering Measurements at Forward and Backward Angles

27. Recent results from the G0 experiment

28. Beam Physics for the 12 GeV Cebaf Upgrade Project

29. Dark Sectors 2016 Workshop: Community Report

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29 results on '"Jay, Benesch"'

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