{"paper":{"title":"The Q_weak Experimental Apparatus","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-ex","physics.acc-ph"],"primary_cat":"physics.ins-det","authors_text":"A. Asaturyan, A.K. Opper, A. Kubera, A. McCreary, A. Micherdzinska, A. Mkrtchyan, A. Narayan, A.R. Lee, A. Subedi, B. Cavness, B. Sawatzky, B. Stokes, B. Waidyawansa, C.A. Davis, D. Androic, D.B. Brown, D.C. Dean, D. Dutta, D. Gaskell, D.J. Harrison, D. Jones, D. Mack, D. Meekins, D.S. Armstrong, D.T. Spayde, D.W. Storey, E. Bonnell, E. Henderson, E. Ihloff, E. Korkmaz, E. Urban, F. Benmokhtar, F. Guo, G. Clark, G.D. Cates, G.R. Smith, H. Mkrtchyan, J.A. Dunne, J.A. Magee, J. Balewski, J. Beaufait, J. Benesch, J. Bessuille, J. Birchall, J. Bowman, J.C. Cornejo, J. Diefenbach, J.F. Dowd, J.F. Rajotte, J. Grames, J. Hansknecht, J.H. Lee, J. Kelsey, J. Leacock, J. Mammei, J. Mei, J.M. Finn, J. Musson, J. Pan, J.P. Leckey, J.R. Echols, J.R. Hoskins, J. Roche, J.W. Martin, K.D. Finelli, K. Dow, K.D. Paschke, K.E. Mesick, K. Grimm, K. Johnston, L. Lee, L.Z. Ndukum, M. Anderson, M. Elaasar, M.H. McDonald, M.H. Shabestari, M.J. McHugh, M. Jones, M. Kargiantoulakis, M.L. Pitt, M.M. Dalton, M. Poelker, M.T.W. Gericke, N. Khan, N. Morgan, N. Simicevic, Nuruzzaman, P. Brindza, P. Medeiros, P.M. King, P. Solvignon, P. Wang, P.W. Rose, Qweak Collaboration:T. Allison, R. Averill, R.B. Zielinski, R.D. Carlini, R. Jones, R. Mahurin, R. Michaels, R.S. Beminiwattha, R. Silwal, R. Subedi, R. Suleiman, S.A. Page, S.A. Wood, S. Covrig Dusa, S. Kowalski, S.K. Phillips, S. MacEwan, S.P. Wells, S. Sobczynski, S. Yang, S. Zhamkochyan, T.D. Averett, T. Seva, V.M. Gray, V. Nelyubin, V. Tadevosyan, V. Tvaskis, W.A. Tobias, W. Deconinck, W.D. Ramsay, W.R. Falk, W.R. Roberts, W.S. Duvall, W.T.H. van Oers, Y. Liang","submitted_at":"2014-09-24T20:58:50Z","abstract_excerpt":"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 ${\\vec{e}}$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 prop"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.7100","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}