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The MUSE Beamline Calorimeter
W. Lin, T. Rostomyan, R. Gilman, S. Strauch, C. Meier, C. Nestler, M. Ali, H. Atac, J. C. Bernauer, W. J. Briscoe, A. Christopher Ndukwe, E. W. Cline, K. Deiters, S. Dogra, E. J. Downie, Z. Duan, I. P. Fernando, A. Flannery, D. Ghosal, A. Golossanov, et al (23)
Aug 27 2024 physics.ins-det nucl-ex arXiv:2408.13380v1

@misc{2408.13380, author = {W.~Lin and T.~Rostomyan and R.~Gilman and S.~Strauch and C.~Meier and C.~Nestler and M.~Ali and H.~Atac and J.~C.~Bernauer and W.~J.~Briscoe and A.~Christopher Ndukwe and E.~W.~Cline and K.~Deiters and S.~Dogra and E.~J.~Downie and Z.~Duan and I.~P.~Fernando and A.~Flannery and D.~Ghosal and A.~Golossanov and J.~Guo and N.~S.~Ifat and Y.~Ilieva and M.~Kohl and I.~Lavrukhin and L.~Li and W.~Lorenzon and P.~Mohanmurthy and S.~J.~Nazeer and M.~Nicol and T.~Patel and A.~Prosnyakov and R.~D.~Ransome and R.~Ratvasky and H.~Reid and P.~E.~Reimer and R.~Richards and G.~Ron and O.~M.~Ruimi and K.~Salamone and N.~Sparveris and N.~Wuerfel and D.~A.~Yaari}, title = {{T}he {MUSE} {B}eamline {C}alorimeter}, year = {2024}, eprint = {2408.13380}, note = {arXiv:2408.13380v1} }
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The MUon Scattering Experiment (MUSE) was motivated by the proton radius puzzle arising from the discrepancy between muonic hydrogen spectroscopy and electron-proton measurements. The MUSE physics goals also include testing lepton universality, precisely measuring two-photon exchange contribution, and testing radiative corrections. MUSE addresses these physics goals through simultaneous measurement of high precision cross sections for electron-proton and muon-proton scattering using a mixed-species beam. The experiment will run at both positive and negative beam polarities. Measuring precise cross sections requires understanding both the incident beam energy and the radiative corrections. For this purpose, a lead-glass calorimeter was installed at the end of the beam line in the MUSE detector system. In this article we discuss the detector specifications, calibration and performance. We demonstrate that the detector performance is well reproduced by simulation, and meets experimental requirements.
Characterization of Muon and Electron Beams in the Paul Scherrer Institute PiM1 Channel for the MUSE Experiment
E. Cline, W. Lin, P. Roy, P. E. Reimer, K. E. Mesick, A. Akmal, A. Alie, H. Atac, A. Atencio, C. Ayerbe Gayoso, N. Benmouna, F. Benmokhtar, J. C. Bernauer, W. J. Briscoe, J. Campbell, D. Cohen, E. O. Cohen, C. Collicott, K. Deiters, S. Dogra, et al (40)
Sep 21 2021 physics.ins-det nucl-ex arXiv:2109.09508v1

@misc{2109.09508, author = {E.~Cline and W.~Lin and P.~Roy and P.~E.~Reimer and K.~E.~Mesick and A.~Akmal and A.~Alie and H.~Atac and A.~Atencio and C.~Ayerbe Gayoso and N.~Benmouna and F.~Benmokhtar and J.~C.~Bernauer and W.~J.~Briscoe and J.~Campbell and D.~Cohen and E.~O.~Cohen and C.~Collicott and K.~Deiters and S.~Dogra and E.~Downie and I.~P.~Fernando and A.~Flannery and T.~Gautam and D.~Ghosal and R.~Gilman and A.~Golossanov and B.~F.~Halter and J.~Hirschman and Y.~Ilieva and M.~Kim and M.~Kohl and B.~Krusche and I.~Lavrukhin and L.~Li and B.~Liang-Gilman and A.~Liyanage and W.~Lorenzon and P.~Mohanmurthy and R.~Mokal and P.~Moran and S.~J.~Nazeer and P.~Or and T.~Patel and E.~Piasetzky and T.~Rauber and R.~S.~Raymond and D.~Reggiani and H.~Reid and G.~Ron and E.~Rooney and T.~Rostomyan and M.~Schwarz and A.~Sneath and P.~G.~Solazzo and N.~Sparveris and N.~Steinberg and S.~Strauch and V.~Sulkosky and N.~Wuerfel}, title = {{C}haracterization of {M}uon and {E}lectron {B}eams in the {P}aul {S}cherrer {I}nstitute {P}i{M}1 {C}hannel for the {MUSE} {E}xperiment}, year = {2021}, eprint = {2109.09508}, note = {arXiv:2109.09508v1} }
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The MUon Scattering Experiment, MUSE, at the Paul Scherrer Institute, Switzerland, investigates the proton charge radius puzzle, lepton universality, and two-photon exchange, via simultaneous measurements of elastic muon-proton and electron-proton scattering. The experiment uses the PiM1 secondary beam channel, which was designed for high precision pion scattering measurements. We review the properties of the beam line established for pions. We discuss the production processes that generate the electron and muon beams, and the simulations of these processes. Simulations of the $\pi$/$\mu$/$e$ beams through the channel using TURTLE and G4beamline are compared. The G4beamline simulation is then compared to several experimental measurements of the channel, including the momentum dispersion at the IFP and target, the shape of the beam spot at the target, and timing measurements that allow the beam momenta to be determined. We conclude that the PiM1 channel can be used for high precision $\pi$, $\mu$, and $e$ scattering.
Timing Detectors with SiPM read-out for the MUSE Experiment at PSI
Tigran Rostomyan, Ethan Cline, Ievgen Lavrukhin, Hamza Atac, Ariella Atencio, Jan C. Bernauer, William J. Briscoe, Dan Cohen, Erez O. Cohen, Cristina Collicott, Konrad Deiters, Shraddha Dogra, Evangeline Downie, Werner Erni, Ishara P. Fernando, Anne Flannery, Thir Gautam, Debdeep Ghosal, Ronald Gilman, Alexander Golossanov, et al (23)
Jul 26 2020 physics.ins-det nucl-ex arXiv:2007.12207v2

@misc{2007.12207, author = {Tigran Rostomyan and Ethan Cline and Ievgen Lavrukhin and Hamza Atac and Ariella Atencio and Jan C.~Bernauer and William J.~Briscoe and Dan Cohen and Erez O.~Cohen and Cristina Collicott and Konrad Deiters and Shraddha Dogra and Evangeline Downie and Werner Erni and Ishara P.~Fernando and Anne Flannery and Thir Gautam and Debdeep Ghosal and Ronald Gilman and Alexander Golossanov and Jack Hirschman and Minjung Kim and Michael Kohl and Bernd Krusche and Lin Li and Win Lin and Anusha Liyanage and Wolfgang Lorenzon and Prajwal Mohanmurthy and Jesmin Nazeer and Paz Or and Tanvi Patel and Eli Piasetzky and Nikolay Pilip and Haley Reid and Paul E.~Reimer and Guy Ron and Ethan Rooney and Yair Shamai and Peter Solazzo and Steffen Strauch and Dan Vidne and Noah Wuerfel}, title = {{T}iming {D}etectors with {S}i{PM} read-out for the {MUSE} {E}xperiment at {PSI}}, year = {2020}, eprint = {2007.12207}, note = {arXiv:2007.12207v2} }
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The Muon Scattering Experiment at the Paul Scherrer Institut uses a mixed beam of electrons, muons, and pions, necessitating precise timing to identify the beam particles and reactions they cause. We describe the design and performance of three timing detectors using plastic scintillator read out with silicon photomultipliers that have been built for the experiment. The Beam Hodoscope, upstream of the scattering target, counts the beam flux and precisely times beam particles both to identify species and provide a starting time for time-of-flight measurements. The Beam Monitor, downstream of the scattering target, counts the unscattered beam flux, helps identify background in scattering events, and precisely times beam particles for time-of-flight measurements. The Beam Focus Monitor, mounted on the target ladder under the liquid hydrogen target inside the target vacuum chamber, is used in dedicated runs to sample the beam spot at three points near the target center, where the beam should be focused.
Technical Design Report for the Paul Scherrer Institute Experiment R-12-01.1: Studying the Proton "Radius" Puzzle with \mup Elastic Scattering
R. Gilman, E.J. Downie, G. Ron, S. Strauch, A. Afanasev, A. Akmal, J. Arrington, H. Atac, C. Ayerbe-Gayoso, F. Benmokhtar, N. Benmouna, J. Bernauer, A. Blomberg, W. J. Briscoe, D. Cioffi, E. Cline, D. Cohen, E. O. Cohen, C. Collicott, K. Deiters, et al (39)
Sep 29 2017 physics.ins-det nucl-ex arXiv:1709.09753v1

@misc{1709.09753, author = {R.~Gilman and E.J.~Downie and G.~Ron and S.~Strauch and A.~Afanasev and A.~Akmal and J.~Arrington and H.~Atac and C.~Ayerbe-Gayoso and F.~Benmokhtar and N.~Benmouna and J.~Bernauer and A.~Blomberg and W.~J.~Briscoe and D.~Cioffi and E.~Cline and D.~Cohen and E.~O.~Cohen and C.~Collicott and K.~Deiters and J.~Diefenbach and B.~Dongwi and D.~Ghosal and A.~Golossanov and R.~Gothe and D.~Higinbotham and D.~Hornidge and Y.~Ilieva and N.~Kalantarians and M.~Kohl and B.~Krusche and G.~Kumbartzki and I.~Lavrukhin and L.~Li and J.~Lichtenstadt and W.~Lin and A.~Liyanage and W.~Lorenzon and K.~E.~Mesick and Z.-E.~Meziani and P.~Mohanmurthy and P.~Moran and J.~Nazeer and E.~Piasetzsky and R.~Ransome and R.~Raymond and D.~Reggiani and P.E.~Reimer and A.~Richter and T.~Rostomyan and P.~Roy and A.~Sarty and Y.~Shamai and N.~Sparveris and N.~Steinberg and I.~Strakovsky and V.~Sulkosky and A.S.~Tadepalli and M.~Taragin}, title = {{T}echnical {D}esign {R}eport for the {P}aul {S}cherrer {I}nstitute {E}xperiment {R}-12-01.1: {S}tudying the {P}roton "{R}adius" {P}uzzle with \mup {E}lastic {S}cattering}, year = {2017}, eprint = {1709.09753}, note = {arXiv:1709.09753v1} }
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The difference in proton radii measured with $\mu p$ atoms and with $ep$ atoms and scattering remains an unexplained puzzle. The PSI MUSE proposal is to measure $\mu p$ and $e p$ scattering in the same experiment at the same time. The experiment will determine cross sections, two-photon effects, form factors, and radii independently for the two reactions, and will allow $\mu p$ and $ep$ results to be compared with reduced systematic uncertainties. These data should provide the best test of lepton universality in a scattering experiment to date, about an order of magnitude improvement over previous tests. Measuring scattering with both particle polarities will allow a test of two-photon exchange at the sub-percent level, about a factor of four improvement on uncertainties and over an order of magnitude more data points than previous low momentum transfer determinations, and similar to the current generation of higher momentum transfer electron experiments. The experiment has the potential to demonstrate whether the $\mu p$ and $ep$ interactions are consistent or different, and whether any difference results from novel physics or two-photon exchange. The uncertainties are such that if the discrepancy is real it should be confirmed with $\approx$5$\sigma$ significance, similar to that already established between the regular and muonic hydrogen Lamb shift.
Long-term stability test of a triple GEM detector
R. P. Adak, S. Biswas, S. Das, D. Ghosal, S. K. Ghosh, A. Mondal, D. Nag, T. K. Nayak, R. N. Patra, S. K Prasad, S. Raha, P. K. Sahu, S. Sahu, S. Swain
Aug 03 2016 physics.ins-det hep-ex arXiv:1608.00562v1

@misc{1608.00562, author = {R.~P.~Adak and S.~Biswas and S.~Das and D.~Ghosal and S.~K.~Ghosh and A.~Mondal and D.~Nag and T.~K.~Nayak and R.~N.~Patra and S.~K Prasad and S.~Raha and P.~K.~Sahu and S.~Sahu and S.~Swain}, title = {{L}ong-term stability test of a triple {GEM} detector}, year = {2016}, eprint = {1608.00562}, note = {arXiv:1608.00562v1} }
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The main aim of the study is to perform the long-term stability test of gain of the single mask triple GEM detector. A simple method is used for this long- term stability test using a radioactive X-ray source with high activity. The test is continued till accumulation of charge per unit area > 12.0 mC/mm2. The details of the chamber fabrication, the test set-up, the method of measurement and the test results are presented in this paper.