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12 results on '"Prajwal Mohanmurthy"'

1. Data Blinding for the nEDM Experiment at PSI

Author

Malgorzata Kasprzak, Philip Harris, D. Pais, J. Hommet, Jacek Zejma, Guillaume Pignol, Kazimierz Bodek, D. Rebreyend, A. Kozela, Geza Zsigmond, Nora Hild, S. Roccia, Prajwal Mohanmurthy, J. Krempel, Y. Kermaidic, Y. Lemière, Antoine Weis, Klaus Kirch, L. Ferraris-Bouchez, N. J. Ayres, P. Flaux, G. Ban, Georg Bison, S. Emmenegger, M. Rawlik, T. Lefort, V. Bondar, Bernhard Lauss, E. Chanel, S. Komposch, M. Daum, Allard Schnabel, Florian M. Piegsa, A. Leredde, A. Mtchedlishvili, D. Rozpedzik, Christopher Crawford, E. Wursten, R. Virot, D. Ries, P.-J. Chiu, Zoran D. Grujić, I. Rienäcker, Philipp Schmidt-Wellenburg, Oscar Naviliat-Cuncic, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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)-Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
Nuclear and High Energy Physics, data analysis method, Physics - Instrumentation and Detectors, Offset (computer science), Blinding, Neutron electric dipole moment, Other Fields of Physics, FOS: Physical sciences, Separate analysis, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, High Energy Physics - Experiment, physics.data-an, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, n: electric moment, 010308 nuclear & particles physics, hep-ex, Probability and statistics, Instrumentation and Detectors (physics.ins-det), Data set, Special Article - New Tools and Techniques, Trustworthiness, Physics - Data Analysis, Statistics and Probability, Algorithm, Data Analysis, Statistics and Probability (physics.data-an), Particle Physics - Experiment, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

Psychological bias towards, or away from, prior measurements or theory predictions is an intrinsic threat to any data analysis. While various methods can be used to try to avoid such a bias, e.g. actively avoiding looking at the result, only data blinding is a traceable and trustworthy method that can circumvent the bias and convince a public audience that there is not even an accidental psychological bias. Data blinding is nowadays a standard practice in particle physics, but it is particularly difficult for experiments searching for the neutron electric dipole moment (nEDM), as several cross measurements, in particular of the magnetic field, create a self-consistent network into which it is hard to inject a false signal. We present an algorithm that modifies the data without influencing the experiment. Results of an automated analysis of the data are used to change the recorded spin state of a few neutrons within each measurement cycle. The flexible algorithm may be applied twice (or more) to the data, thus providing the option of sequentially applying various blinding offsets for separate analysis steps with independent teams. The subtle manner in which the data are modified allows one subsequently to adjust the algorithm and to produce a re-blinded data set without revealing the initial blinding offset. The method was designed for the 2015/2016 measurement campaign of the nEDM experiment at the Paul Scherrer Institute. However, it can be re-used with minor modification for the follow-up experiment n2EDM, and may be suitable for comparable projects elsewhere., The European Physical Journal A, 57 (4), ISSN:1434-6001, ISSN:1434-601X

Published
2020
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2. Measurement of the permanent electric dipole moment of the neutron

Author

I. Rienäcker, V. Hélaine, M. Daum, Prajwal Mohanmurthy, J. A. Thorne, J. Krempel, J. Zenner, S. Roccia, Jacek Zejma, Martin Burghoff, E. Wursten, N. J. Ayres, G. Wyszynski, W. C. Griffith, G. Ban, M. G. D. van der Grinten, R. Virot, C. Abel, Bernhard Lauss, Florian M. Piegsa, P. N. Prashanth, P. J. Chiu, Christopher Crawford, Nathal Severijns, Oscar Naviliat-Cuncic, Antoine Weis, S. Afach, Guillaume Pignol, M. Kuźniak, Jens-Uwe Voigt, R. Tavakoli Dinani, A. Knecht, C. Plonka-Spehr, Geza Zsigmond, D. Rozpedzik, Z. Hodge, A. Kraft, Martin Fertl, P. Flaux, Reinhold Henneck, P. A. Koss, M. Horras, G. Rogel, Y. Kermaidic, E. Pierre, Paul E. Knowles, S. Komposch, A. Kozela, Georg Bison, M. Rawlik, D. Rebreyend, E. Chanel, L. Ferraris-Bouchez, Z. Chowdhuri, D. Ries, P. Geltenbort, Klaus Kirch, L. Hayen, Zoran D. Grujić, K. Green, Y. Lemière, Werner Heil, G. Quéméner, P. Schmidt-Wellenburg, S. N. Ivanov, C.A. Baker, H. C. Koch, P. Iaydjiev, V. Bondar, T. Lefort, B. Clement, Malgorzata Kasprzak, A. Mtchedlishvili, Philip Harris, Allard Schnabel, M. Musgrave, S. Emmenegger, D. Shiers, D. Pais, N. Hild, A. Fratangelo, Kazimierz Bodek, B. Franke, A. Leredde, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, nEDM, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-Université Grenoble Alpes (UGA)

Subjects
Physics - Instrumentation and Detectors, Magnetometer, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, Measure (mathematics), S017EDM, law.invention, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), statistical analysis, law, cesium, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], time reversal: invariance, Statistical analysis, Neutron, Nuclear Physics - Experiment, Physics::Atomic Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, Physics, n: electric moment, Instrumentation and Detectors (physics.ins-det), Cesium vapor, Magnetic field, Electric dipole moment, Automatic Keywords, Ultracold neutrons, Elementary Particles and Fields, history, Atomic physics, time reversal: violation, magnetic field: oscillation, Particle Physics - Experiment
Abstract

We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey’s method of separated oscillating magnetic fields with ultracold neutrons. Our measurement stands in the long history of EDM experiments probing physics violating time-reversal invariance. The salient features of this experiment were the use of a 199Hg comagnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic-field changes. The statistical analysis was performed on blinded datasets by two separate groups, while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. The measured value of the neutron EDM is dn=(0.0±1.1stat±0.2sys)×10−26 e.cm., Physical Review Letters, 124 (8), ISSN:0031-9007, ISSN:1079-7114

Published
2020
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3. Timing detectors with SiPM read-out for the MUSE experiment at PSI

Author

T. Rostomyan, I.P. Fernando, P. Solazzo, B. Krusche, C. Collicott, P. E. Reimer, I. Lavrukhin, A. Liyanage, T. Gautam, Konrad Deiters, S. Strauch, L. Li, A. Atencio, Noah Wuerfel, A. Flannery, S. Dogra, Wolfgang Lorenzon, E. Rooney, Jan C. Bernauer, Prajwal Mohanmurthy, Eliahu Cohen, P. Or, W. Lin, W. Erni, W. J. Briscoe, J. Hirschman, D. Vidne, E. J. Downie, E. Piasetzky, E. Cline, M. Kim, Guy Ron, H. Atac, A. Golossanov, Dan Cohen, Michael Kohl, H. Reid, J. Nazeer, T. Patel, N. Pilip, D. Ghosal, Ronald Gilman, and Y. Shamai

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Scattering, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Electron, Scintillator, 01 natural sciences, Optics, Silicon photomultiplier, Hodoscope, 0103 physical sciences, Physics::Accelerator Physics, Vacuum chamber, Nuclear Experiment (nucl-ex), 010306 general physics, business, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract

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., Fixed typos, added references, and rephrased some sections to be clearer. Changed numbering of tables and figures in Appendix

Published
2021
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4. The n2EDM experiment at the Paul Scherrer Institute

Author

E. Wursten, A. Kozela, Oscar Naviliat-Cuncic, Prajwal Mohanmurthy, J. A. Thorne, S. Roccia, Allard Schnabel, Georg Bison, M. Rawlik, S. Emmenegger, P. A. Koss, M. Daum, D. Rozpedzik, Guillaume Pignol, E. Chanel, Natalis Severijns, C. Abel, Bernhard Lauss, Kazimierz Bodek, D. Ries, Jacek Zejma, Philip Harris, A. Leredde, Geza Zsigmond, Jens Voigt, G. Ban, W. C. Griffith, Christopher Crawford, D. Pais, J. Krempel, P. Flaux, Y. Lemière, Werner Heil, D. Rebreyend, Nora Hild, N. J. Ayres, Klaus Kirch, P. Schmidt-Wellenburg, P.-J. Chiu, T. Lefort, R. Virot, B. Clement, Zoran D. Grujić, Antoine Weis, V. Bondar, Florian M. Piegsa, L. Ferraris-Bouchez, K. U. Ross, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-Université Grenoble Alpes (UGA)

Subjects
Neutron transport, Physics - Instrumentation and Detectors, Neutron electric dipole moment, Physics::Instrumentation and Detectors, QC1-999, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Chamber design, 0103 physical sciences, Neutron, spectrometer: design, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, n: electric moment, Spectrometer, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), sensitivity, Measuring instrument, Ultracold neutrons, Nucleon, performance
Abstract

We present the new spectrometer for the neutron electric dipole moment (nEDM) search at the Paul Scherrer Institute (PSI), called n2EDM. The setup is at room temperature in vacuum using ultracold neutrons. n2EDM features a large UCN double storage chamber design with neutron transport adapted to the PSI UCN source. The design builds on experience gained from the previous apparatus operated at PSI until 2017. An order of magnitude increase in sensitivity is calculated for the new baseline setup based on scalable results from the previous apparatus, and the UCN source performance achieved in 2016., Submitted as a web of conference proceedings paper

Published
2019
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5. nEDM experiment at PSI : data-taking strategy and sensitivity of the dataset

Author

Y. Kermaidic, Philip Harris, Kazimierz Bodek, D. Ries, Jacek Zejma, W. C. Griffith, Prajwal Mohanmurthy, J. A. Thorne, J. Krempel, S. Roccia, N. J. Ayres, Jens-Uwe Voigt, Georg Bison, D. Rebreyend, S. Emmenegger, D. Pais, Guillaume Pignol, C. Abel, Bernhard Lauss, R. Virot, D. Rozpedzik, T. Lefort, Geza Zsigmond, P. A. Koss, L. Ferraris-Bouchez, Oscar Naviliat-Cuncic, M. Rawlik, G. Ban, P. Flaux, M. Musgrave, A. Leredde, Philipp Schmidt-Wellenburg, Nathal Severijns, Allard Schnabel, E. Chanel, E. Wursten, Y. Lemière, M. Daum, N. Hild, Klaus Kirch, Florian M. Piegsa, P.-J. Chiu, Antoine Weis, V. Bondar, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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)-Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Jenke, Tobias, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
Physics, Physics - Instrumentation and Detectors, Neutron electric dipole moment, 010308 nuclear & particles physics, business.industry, Magnetometer, QC1-999, Statistical sensitivity, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Magnetic field, law.invention, Optics, law, 0103 physical sciences, Ultracold neutrons, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, business, Nuclear Experiment, Single chamber
Abstract

We report on the strategy used to optimize the sensitivity of our search for a neutron electric dipole moment at the Paul Scherrer Institute. Measurements were made upon ultracold neutrons stored within a single chamber at the heart of our apparatus. A mercury cohabiting magnetometer together with an array of cesium magnetometers were used to monitor the magnetic field, which was controlled and shaped by a series of precision field coils. In addition to details of the setup itself, we describe the chosen path to realize an appropriate balance between achieving the highest statistical sensitivity alongside the necessary control on systematic effects. The resulting irreducible sensitivity is better than 1 × 10−26e cm. This contribution summarizes in a single coherent picture the results of the most recent publications of the collaboration., EPJ Web of Conferences, 219, ISSN:2100-014X, ISSN:2101-6275

Published
2019
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6. Magnetic field uniformity in neutron electric dipole moment experiments

Author

D. Ries, P. Geltenbort, P. Iaydjiev, P. Flaux, D. Rebreyend, A. Leredde, T. Baker, Jacek Zejma, Z. Chowdhuri, Nathal Severijns, Christopher Crawford, Prajwal Mohanmurthy, J. Krempel, W. C. Griffith, Allard Schnabel, S. Komposch, G. Quéméner, Georg Bison, H. C. Koch, S. Emmenegger, M. G. D. van der Grinten, Malgorzata Kasprzak, Y. Kermaidic, Antoine Weis, Florian M. Piegsa, S. Roccia, D. Pais, V. Bondar, N. Hild, Y. Lemiere, Philip Harris, Klaus Kirch, C. Abel, Bernhard Lauss, S. N. Ivanov, P. A. Koss, K. Green, L. Ferraris-Bouchez, B. Dechenaux, Guillaume Pignol, E. Wursten, D. Rozpedzik, Reinhold Henneck, G. Ban, M. Daum, P. J. Chiu, T. Lefort, N. J. Ayres, A. Kozela, R. Virot, G. Wyszynski, Philipp Schmidt-Wellenburg, Kazimierz Bodek, M. Rawlik, E. Chanel, Geza Zsigmond, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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)-Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
Physics - Instrumentation and Detectors, Neutron electric dipole moment, mercury: atom, measurement methods, FOS: Physical sciences, Harmonic polynomial, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, 010305 fluids & plasmas, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, Physics::Atomic Physics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Fundamental concepts, QC, Physics, Larmor precession, Measurement method, n: electric moment, n: depolarization, mathematical methods, Instrumentation and Detectors (physics.ins-det), Magnetic field, Computational physics, Electric dipole moment, magnetic field: parametrization, Ultracold neutrons
Abstract

© 2019 American Physical Society. Magnetic-field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial modes is proposed, going beyond the linear-gradients approximation. We review the main undesirable effects of nonuniformities: depolarization of ultracold neutrons and Larmor frequency shifts of neutrons and mercury atoms. The theoretical predictions for these effects were verified by dedicated measurements with the single-chamber neutron electric-dipole-moment apparatus installed at the Paul Scherrer Institute. ispartof: Physical Review A vol:99 issue:4 status: published

Published
2019
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7. Determining the neutrino mass with cyclotron radiation emission spectroscopy—Project 8

Author

Jared A. Kofron, Gray Rybka, Callum Lamb, R. Cervantes, P. J. Doe, Andre Young, L. Saldaña, Joseph A. Formaggio, Devyn Rysewyk, E. Zayas, M. L. Miller, B. A. VanDevender, Kareem Kazkaz, Luiz de Viveiros, Martin Fertl, Jonathan Weintroub, Walter C. Pettus, L J Rosenberg, A. Mark Jones, Eric Machado, S. Doeleman, C. Claessens, D. Furse, Sebastian Böser, James Nikkel, Prajwal Mohanmurthy, Benjamin H. LaRoque, Justin L. Fernandes, Mathieu Guigue, Natasha L. Woods, Benjamin Monreal, R. G. Hamish Robertson, Erin C. Finn, Ali Ashtari Esfahani, P. L. Slocum, Thomas Thümmler, Matthew Sternberg, David M. Asner, K. M. Heeger, Elizabeth L. McBride, Laura Vertatschitsch, M. Wachtendonk, N. S. Oblath, Jonathan R. Tedeschi, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Formaggio, Joseph A, Furse, Daniel Lawrence, Mohanmurthy, Prajwal Thyagarthi, Solomon-Oblath, Noah, Rysewyk, Devyn M., and Zayas, Evan M.

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 7. Clean energy, 01 natural sciences, Upper and lower bounds, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Cyclotron radiation, Emission spectrum, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Neutrino, 010306 general physics, Neutrino oscillation, Adiabatic process, Nuclear Experiment, KATRIN
Abstract

The most sensitive direct method to establish the absolute neutrino mass is observation of the endpoint of the tritium beta-decay spectrum. Cyclotron Radiation Emission Spectroscopy (CRES) is a precision spectrographic technique that can probe much of the unexplored neutrino mass range with $\mathcal{O}({\rm eV})$ resolution. A lower bound of $m(\nu_e) \gtrsim 9(0.1)\, {\rm meV}$ is set by observations of neutrino oscillations, while the KATRIN Experiment - the current-generation tritium beta-decay experiment that is based on Magnetic Adiabatic Collimation with an Electrostatic (MAC-E) filter - will achieve a sensitivity of $m(\nu_e) \lesssim 0.2\,{\rm eV}$. The CRES technique aims to avoid the difficulties in scaling up a MAC-E filter-based experiment to achieve a lower mass sensitivity. In this paper we review the current status of the CRES technique and describe Project 8, a phased absolute neutrino mass experiment that has the potential to reach sensitivities down to $m(\nu_e) \lesssim 40\,{\rm meV}$ using an atomic tritium source., Comment: 19 pages, 8 figures, to be published in Journal of Physics G

Published
2016

8. Design and Test of Wire-Scanners for SwissFEL

Author

Orlandi, G. L., Baldinger, M., Brands, H., Heimgartner, P., Ischebeck, R., Kammerer, A., Löhl, F., Lüscher, R., Prajwal Mohanmurthy, Ozkan, C., Schlott, V., Schulz, L., Rippstein, B., Seiler, C., Trovati, S., Valitutti, P., and Zimoch, D.

Subjects
Accelerator Physics (physics.acc-ph), Physics - Instrumentation and Detectors, FOS: Physical sciences, Physics - Accelerator Physics, Instrumentation and Detectors (physics.ins-det)
Abstract

The SwissFEL light-facility will provide coherent X-rays in the wavelength region 7-0.7 nm and 0.7-0.1 nm. In SwissFEL, view-screens and wire-scanners will be used to monitor the transverse profile of a 200/10pC electron beam with a normalized emittance of 0.4/0.2 mm.mrad and a final energy of 5.8 GeV. Compared to view screens, wire-scanners offer a quasi-non-destructive monitoring of the beam transverse profile without suffering from possible micro-bunching of the electron beam. The main aspects of the design, laboratory characterization and beam-test of the SwissFEL wire-scanner prototype will be discussed., Comment: Proceedings of the 36th International Free Electron Laser Conference, 2014 (5 pages, 7 figures)

Published
2016
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9. Test of Lorentz Invarience from Compton Scattering

Author

Prajwal Mohanmurthy, Dutta, Dipangkar, and Narayan, Amrendra

Subjects
Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

In the recent times, test of Lorentz Invariance has been used as a means to probe theories of physics beyond the standard model. We describe a simple way of utilizing the polarimeters, which are a critical beam instrument at precision and intensity frontier nuclear physics labs such as the erstwhile Stanford Linear Accelerator Center (SLAC) and Jefferson Lab (JLab), to constrain the dependence of vacuum dispersion with the energy of the photons and its direction of propagation at unprecedented level of precision. We obtain a limit of minimal Standard Model extension (MSME) parameters: $\sqrt{\kappa_X^2 + \kappa_Y^2} < 4.6 \times 10^{-10}$ and $\sqrt{\left( 2c_{TX} - (\tilde{\kappa}_{0^+}^{YZ} \right)^2 + \left( 2c_{TY} - (\tilde{\kappa}_{0^+}^{ZX} \right)^2} < 4.6 \times 10^{-10}$. We also obtain a leading constraint for the refractive index of free space $n = 1 + (2.44\times10^{-9} \pm 6.82\times 10^{-9})$., Comment: Presentation at the DPF 2015 Meeting of the American Physical Society Division of Particles and Fields, Ann Arbor, Michigan, August 4-8, 2015. Abs ID: 22. 12 Pages, 5 Figures, updated

Published
2015

10. Single-Electron Detection and Spectroscopy via Relativistic Cyclotron Radiation

Author

Thomas Thümmler, N. S. Oblath, D. M. Asner, Justin L. Fernandes, L. J. Rosenberg, Matthew Sternberg, B H LaRoque, Elizabeth L. McBride, D. Furse, P. J. Doe, Natasha L. Woods, Richard F. Bradley, Devyn Rysewyk, Gray Rybka, Erin C. Finn, Martin Fertl, Benjamin Monreal, L. de Viveiros, J. N. Kofron, M. Leber, Joseph A. Formaggio, Prajwal Mohanmurthy, B. A. VanDevender, M. L. Miller, R. G. H. Robertson, Jonathan R. Tedeschi, and A. M. Jones

Subjects
Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Cyclotron, Cyclotron resonance, FOS: Physical sciences, General Physics and Astronomy, Synchrotron radiation, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Electron cyclotron resonance, Fourier transform ion cyclotron resonance, High Energy Physics - Experiment, law.invention, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, 0103 physical sciences, Cyclotron radiation, Nuclear Experiment (nucl-ex), Particle radiation, 010306 general physics, Nuclear Experiment, Ion cyclotron resonance
Abstract

It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Cyclotron radiation, the particular form of radiation emitted by an electron orbiting in a magnetic field, was first derived in 1904. Despite the simplicity of this concept, and the enormous utility of electron spectroscopy in nuclear and particle physics, single-electron cyclotron radiation has never been observed directly. Here we demonstrate single-electron detection in a novel radiofrequency spec- trometer. We observe the cyclotron radiation emitted by individual magnetically-trapped electrons that are produced with mildly-relativistic energies by a gaseous radioactive source. The relativistic shift in the cyclotron frequency permits a precise electron energy measurement. Precise beta elec- tron spectroscopy from gaseous radiation sources is a key technique in modern efforts to measure the neutrino mass via the tritium decay endpoint, and this work demonstrates a fundamentally new approach to precision beta spectroscopy for future neutrino mass experiments., 6 pages, 3 figures

Published
2015
Full Text
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11. A Spin-Light Polarimeter for Multi-GeV Longitudinally Polarized Electron Beams

Author

Dipangkar Dutta and Prajwal Mohanmurthy

Subjects
Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Physics beyond the Standard Model, Polarimetry, FOS: Physical sciences, Synchrotron radiation, Electron, law.invention, Nuclear physics, law, Nuclear Experiment (nucl-ex), Electrical and Electronic Engineering, Collider, Nuclear Experiment, Physics, Electroweak interaction, Polarimeter, Particle accelerator, Instrumentation and Detectors (physics.ins-det), Polarization (waves), Nuclear Energy and Engineering, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics - Accelerator Physics
Abstract

The physics program at the upgraded Jefferson Lab (JLab) and the physics program envisioned for the proposed electron-ion collider (EIC) include large efforts to search for interactions beyond the Standard Model (SM) using parity violation in electroweak interactions. These experiments require precision electron polarimetry with an uncertainty of $, Comment: 10 pages, 11 figures, 3 table; IEEE Transactions on Nuclear Science

Published
2013

12. Dark Matter Search in a Beam-Dump EXperiment (BDX) at Jefferson Lab -- 2018 Update to PR12-16-001

Author

Battaglieri, M., Bersani, A., Bracco, G., Caiffi, B., Celentano, A., Vita, R., Marsicano, L., Musico, P., Panza, F., Ripani, M., Santopinto, E., Taiuti, M., Bellini, V., Bondí, M., Castorina, P., Napoli, M., Italiano, A., Kuznetzov, V., Leonora, E., Mammoliti, F., Randazzo, N., Re, L., Russo, G., Russo, M., Shahinyan, A., Sperduto, M., Spinali, S., Sutera, C., Tortorici, F., Baltzell, N., Dalton, M., Freyberger, A., Girod, F. -X, Kharashvili, G., Kubarovsky, V., Pasyuk, E., Smith, E. S., Stepanyan, S., Szumilla-Vance, H., Ungaro, M., Whitlatch, T., Krnjaic, G., Izaguirre, E., Ehle, I., Snowden-Ifft, D., Loomba, D., Carpinelli, M., D Urso, D., Gabrieli, A., Maccioni, G., Sant, M., Sipala, V., Ameli, F., Cisbani, E., Persio, F., Del Dotto, A., Garibaldi, F., Meddi, F., Nicolau, C. A., Urciuoli, G. M., Chiarusi, T., Manzali, M., Pellegrino, C., Schuster, P., Toro, N., Essig, R., Wood, M. H., Holtrop, M., Paremuzyan, R., Cataldo, G., Leo, R., Di Bari, D., Lagamba, L., Nappi, E., Perrino, R., Balossino, I., Barion, L., Ciullo, G., Contalbrigo, M., Drago, A., Lenisa, P., Movsisyan, A., Pappalardo, L., Spizzo, F., Turisini, M., Hasch, D., Lucherini, V., Mirazita, M., Pisano, S., Tomassini, S., Simi, G., D Angelo, A., Lanza, L., Rizzo, A., Filippi, A., Genovese, M., Kunkel, M., Bashkanov, M., Murphy, A., Smith, G., Watts, D., Zachariou, N., Zana, L., Glazier, D., Ireland, D., Mckinnon, B., Sokhan, D., Colaneri, L., Anefalos Pereira, S., Afanasev, A., Briscoe, B., Fegan, S., Strakovsky, I., Kalantarians, N., Szmilla, H., Weinstein, L., Adhikari, K. P., Dunne, J. A., Dutta, D., El Fassi, L., Ye, L., Hicks, K., Cole, P., Dobbs, S., Fanelli, C., Prajwal Mohanmurthy, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), BDX, and HEP, INSPIRE

Subjects
Physics - Instrumentation and Detectors, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), dark matter: detector, cosmic background radiation, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], beam dump, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], proposed experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], numerical calculations: Monte Carlo, detector: design, activity report, Jefferson Lab
Abstract

This document complements and completes what was submitted last year to PAC45 as an update to the proposal PR12-16-001 "Dark matter search in a Beam-Dump eXperiment (BDX)" at Jefferson Lab submitted to JLab-PAC44 in 2016. Following the suggestions contained in the PAC45 report, in coordination with the lab, we ran a test to assess the beam-related backgrounds and validate the simulation framework used to design the BDX experiment. Using a common Monte Carlo framework for the test and the proposed experiment, we optimized the selection cuts to maximize the reach considering simultaneously the signal, cosmic-ray background (assessed in Catania test with BDX-Proto) and beam-related backgrounds (irreducible NC and CC neutrino interactions as determined by simulation). Our results confirmed what was presented in the original proposal: with 285 days of a parasitic run at 65 $\mu$A (corresponding to $10^{22}$ EOT) the BDX experiment will lower the exclusion limits in the case of no signal by one to two orders of magnitude in the parameter space of dark-matter coupling versus mass.

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