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The MUSE Target Chamber Post Veto

Ratvasky, R. [George Washington Univ., Washington, DC (United States); Argonne National Laboratory (ANL), Lemont, IL (United States)] (ORCID:0000000321425932)·Rostomyan, T. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000234031628)·Ali, M. [New Mexico State Univ., Las Cruces, NM (United States)] (ORCID:0000000314877615)·Atac, H. [Temple Univ., Philadelphia, PA (United States)] (ORCID:0000000289455305)·Barchetti, F. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]·Bernauer, J. C. [Stony Brook Univ., NY (United States)] (ORCID:0000000199562115)·Briscoe, W. J. [George Washington Univ., Washington, DC (United States)]·Ndukwe, A. Christopher [Hampton Univ., Hampton, VA (United States)]·Cline, E. W. [Stony Brook Univ., NY (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)] (ORCID:0000000191303856)·Das, S. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0009000574327529)·Deiters, K. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]·Downie, E. J. [George Washington Univ., Washington, DC (United States)] (ORCID:000000015209000X)·Duan, Z. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0009000865307675)·Flannery, A. [Hampton Univ., Hampton, VA (United States); Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0009000800056879)·Foster, M. [George Washington Univ., Washington, DC (United States)]·Friebolin, A. [George Washington Univ., Washington, DC (United States)] (ORCID:0009000016885171)·Gantert, M. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]·Gilman, R. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000271062845)·Golossanov, A. [Hampton Univ., Hampton, VA (United States)]·Guo, J. [Rutgers Univ., Piscataway, NJ (United States)]·Hirschman, J. [George Washington Univ., Washington, DC (United States)] (ORCID:0000000341105805)·Hofer, A. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]·Ifat, N. S. [Temple Univ., Philadelphia, PA (United States)]·Ilieva, Y. [Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0000000335730057)·Jayakodige, D. [Hampton Univ., Hampton, VA (United States)] (ORCID:0000000336988068)·Krahulik, T. [George Washington Univ., Washington, DC (United States)] (ORCID:0000000215497131)·Kohl, M. [Hampton Univ., Hampton, VA (United States)] (ORCID:0000000343422863)·Lavrukhin, I. [George Washington Univ., Washington, DC (United States); Univ. of Michigan, Ann Arbor, MI (United States)]·Lin, W. [Rutgers Univ., Piscataway, NJ (United States)]·Lorenzon, W. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000306578463)·MohanMurthy, P. [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)] (ORCID:0000000275737010)·Nicol, M. [Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0000000151619549)·Paolone, M. [New Mexico State Univ., Las Cruces, NM (United States)] (ORCID:0000000289806670)·Patel, T. [Hampton Univ., Hampton, VA (United States)] (ORCID:0000000202220213)·Prosnyakov, A. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics] (ORCID:0000000273479126)·Ransome, R. D. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000282906417)·Raymond, R. [Univ. of Michigan, Ann Arbor, MI (United States)]·Reid, H. [Univ. of Michigan, Ann Arbor, MI (United States)]·Reimer, P. E. [Argonne National Laboratory (ANL), Lemont, IL (United States)] (ORCID:0000000203012176)·Richards, R. [Hampton Univ., Hampton, VA (United States)]·Ron, G. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics] (ORCID:0000000281297146)·Ruimi, O. M. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics; Helmholtz Institute Mains (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Johannes Gutenberg Univ., Mainz (Germany)] (ORCID:000000017376670X)·Salamone, K. [Stony Brook Univ., NY (United States)] (ORCID:0000000207415108)·Shrestha, S. [Temple Univ., Philadelphia, PA (United States)]·Sparveris, N. [Temple Univ., Philadelphia, PA (United States)] (ORCID:0000000262781178)·Strauch, S. [Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0000000185581884)·Wuerfel, N. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000198725330)·Yaari, D. A. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics] (ORCID:000900007795218X)·Zimmerli, C. [George Washington Univ., Washington, DC (United States)]
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Abstract

The Muon Scattering Experiment (MUSE) was developed to address the proton radius puzzle through simultaneous electron–proton and muon-proton scattering using the Paul Scherrer Institute’s πM1 secondary beamline. MUSE uses a large-solid-angle, non-magnetic spectrometer to detect beam particles scattering from a liquid hydrogen cell contained within a vacuum chamber. Due to the large scattering windows, the structural integrity of the chamber is supported by posts located at small scattering angles. While out of the acceptance, particles in the tails of the beam distribution can strike these posts, causing a significant trigger background. We describe the design and performance of the Target Chamber Post Veto (TCPV) detector installed inside the vacuum chamber to remove these background events at the trigger level.

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Ratvasky, R. [George Washington Univ., Washington, DC (United States); Argonne National Laboratory (ANL), Lemont, IL (United States)] (ORCID:0000000321425932), Rostomyan, T. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)] (ORCID:0000000234031628), Ali, M. [New Mexico State Univ., Las Cruces, NM (United States)] (ORCID:0000000314877615), Atac, H. [Temple Univ., Philadelphia, PA (United States)] (ORCID:0000000289455305), Barchetti, F. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)], Bernauer, J. C. [Stony Brook Univ., NY (United States)] (ORCID:0000000199562115), Briscoe, W. J. [George Washington Univ., Washington, DC (United States)], Ndukwe, A. Christopher [Hampton Univ., Hampton, VA (United States)], Cline, E. W. [Stony Brook Univ., NY (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)] (ORCID:0000000191303856), Das, S. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0009000574327529), Deiters, K. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)], Downie, E. J. [George Washington Univ., Washington, DC (United States)] (ORCID:000000015209000X), Duan, Z. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0009000865307675), Flannery, A. [Hampton Univ., Hampton, VA (United States); Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0009000800056879), Foster, M. [George Washington Univ., Washington, DC (United States)], Friebolin, A. [George Washington Univ., Washington, DC (United States)] (ORCID:0009000016885171), Gantert, M. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)], Gilman, R. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000271062845), Golossanov, A. [Hampton Univ., Hampton, VA (United States)], Guo, J. [Rutgers Univ., Piscataway, NJ (United States)], Hirschman, J. [George Washington Univ., Washington, DC (United States)] (ORCID:0000000341105805), Hofer, A. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)], Ifat, N. S. [Temple Univ., Philadelphia, PA (United States)], Ilieva, Y. [Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0000000335730057), Jayakodige, D. [Hampton Univ., Hampton, VA (United States)] (ORCID:0000000336988068), Krahulik, T. [George Washington Univ., Washington, DC (United States)] (ORCID:0000000215497131), Kohl, M. [Hampton Univ., Hampton, VA (United States)] (ORCID:0000000343422863), Lavrukhin, I. [George Washington Univ., Washington, DC (United States); Univ. of Michigan, Ann Arbor, MI (United States)], Lin, W. [Rutgers Univ., Piscataway, NJ (United States)], Lorenzon, W. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000306578463), MohanMurthy, P. [Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)] (ORCID:0000000275737010), Nicol, M. [Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0000000151619549), Paolone, M. [New Mexico State Univ., Las Cruces, NM (United States)] (ORCID:0000000289806670), Patel, T. [Hampton Univ., Hampton, VA (United States)] (ORCID:0000000202220213), Prosnyakov, A. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics] (ORCID:0000000273479126), Ransome, R. D. [Rutgers Univ., Piscataway, NJ (United States)] (ORCID:0000000282906417), Raymond, R. [Univ. of Michigan, Ann Arbor, MI (United States)], Reid, H. [Univ. of Michigan, Ann Arbor, MI (United States)], Reimer, P. E. [Argonne National Laboratory (ANL), Lemont, IL (United States)] (ORCID:0000000203012176), Richards, R. [Hampton Univ., Hampton, VA (United States)], Ron, G. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics] (ORCID:0000000281297146), Ruimi, O. M. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics; Helmholtz Institute Mains (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Johannes Gutenberg Univ., Mainz (Germany)] (ORCID:000000017376670X), Salamone, K. [Stony Brook Univ., NY (United States)] (ORCID:0000000207415108), Shrestha, S. [Temple Univ., Philadelphia, PA (United States)], Sparveris, N. [Temple Univ., Philadelphia, PA (United States)] (ORCID:0000000262781178), Strauch, S. [Univ. of South Carolina, Columbia, SC (United States)] (ORCID:0000000185581884), Wuerfel, N. [Univ. of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000198725330), Yaari, D. A. [Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics] (ORCID:000900007795218X), Zimmerli, C. [George Washington Univ., Washington, DC (United States)]. 2026-04-30. The MUSE Target Chamber Post Veto. https://doi.org/10.1016/j.nima.2026.171621

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