Showing 1–8 of 8 results for author: Clement, B

The `n2EDM MSR' -- a very large magnetically shielded room with an exceptional performance for fundamental physics measurements

Authors: N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, T. Bouillaud, B. Clement, E. Chanel, P. -J. Chiu, C. B. Crawford, M. Daum, C. B. Doorenbos, S. Emmenegger, A. Fratangelo, M. Fertl, W. C. Griffith, Z. D. Grujic, P. G. Harris, K. Kirch, J. Krempel, B. Lauss, T. Lefort, O. Naviliat-Cuncic, D. Pais, F. M. Piegsa , et al. (19 additional authors not shown)

Abstract: We present the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute which features an interior cubic volume with each side of length 2.92m, thus providing an accessible space of 25m3. The MSR has 87 openings up to 220mm diameter to operate the experimental apparatus inside, and an intermediate space between the layers for sensitive signal processing electronics.… ▽ More We present the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute which features an interior cubic volume with each side of length 2.92m, thus providing an accessible space of 25m3. The MSR has 87 openings up to 220mm diameter to operate the experimental apparatus inside, and an intermediate space between the layers for sensitive signal processing electronics. The characterization measurements show a remanent magnetic field in the central 1m3 below 100pT, and a field below 600pT in the entire inner volume, up to 4\,cm to the walls. The quasi-static shielding factor at 0.01\,Hz measured with a sinusoidal 2muT peak-to-peak signal is about 100,000 in all three spatial directions and rises fast with frequency to reach 10^8 above 1Hz. △ Less

Submitted 21 June, 2022; originally announced June 2022.

Comments: 10 pages, 15 Figures, submitted to Review of Scientific Instruments

$n-n'$ Oscillations: Sensitivity of a first UCN beam experiment

Authors: G. Ban, J. Chen, P. -J. Chiu, B. Clément, M. Guigue, T. Jenke, P. Larue, T. Lefort, O. Naviliat-Cuncic, B. Perriolat, G. Pignol, S. Roccia, W. Saenz-Arevalo, P. Schmidt-Wellenburg

Abstract: Oscillations of the neutron into a hidden sector particle are processes predicted in various Standard Model extensions. This extra channel for neutron disappearance has not been tested experimentally in large portions of the oscillation parameter space. Several efforts have been recently made on revising the oscillation time limits at low mass-splitting in ultra-cold neutron (UCN) storage experime… ▽ More Oscillations of the neutron into a hidden sector particle are processes predicted in various Standard Model extensions. This extra channel for neutron disappearance has not been tested experimentally in large portions of the oscillation parameter space. Several efforts have been recently made on revising the oscillation time limits at low mass-splitting in ultra-cold neutron (UCN) storage experiments, and at larger mass-splitting in passing-through-wall experiments. In this work, we present the expected sensitivity of an experiment searching for neutron hidden neutron oscillations at intermediate mass-splitting via the application of magnetic fields in the range $B_0=30-1100$ $μ$T. This experiment was performed at the Institut-Laue-Langevin using a novel UCN counter to monitor the beam flux. The measured UCN rate and the data collection technique predict a sensitivity on the oscillation time at the level of a couple of seconds. △ Less

Submitted 17 June, 2022; originally announced June 2022.

Comments: contribution to the 2022 EW session of the 56th Rencontres de Moriond

Report number: 01

Manipulation of gravitational quantum states of a bouncing neutron with the GRANIT spectrometer

Authors: Benoit Clément, Stefan Baeßler, Valery V. Nesvizhevsky, Emily Perry, Guillaume Pignol, Jason A. Pioquinto, Konstantin V. Protasov, Dominique Rebreyend, Damien Roulier, Lingnan Shen, Alexander V. Strelkov, Francis Vezzu

Abstract: The bouncing neutron is one of the rare system where gravity can be studied in a quantum framework. To this end it is crucial to be able to select some specific gravitational quantum state (GQS). The GRANIT apparatus is the first physics experiment connected to a superthermal helium UCN source. We report on the methods developed for this instrument showing how specific GQS can be favored using a s… ▽ More The bouncing neutron is one of the rare system where gravity can be studied in a quantum framework. To this end it is crucial to be able to select some specific gravitational quantum state (GQS). The GRANIT apparatus is the first physics experiment connected to a superthermal helium UCN source. We report on the methods developed for this instrument showing how specific GQS can be favored using a step between mirrors and an absorbing slit. We explore the increase of GQS separation efficiency by increasing the absorber roughness amplitude, and find it is feasible but requires a high adjustment precision. We also quantify the transmission of the absorbing slit leading to a measurement of the spatial extension of the neutron vertical wave function $z_0 = \hbar^{2/3}\left(2m^2g\right)^{-1/3} = 5.9\pm0.3\,μ$m. △ Less

Submitted 23 May, 2022; originally announced May 2022.

Comments: 5 pages, 3 figures

Spatial resolution determination of a position sensitive ultra-cold neutron detector

Authors: B. Clément, L. Gesson, T. Jenke, V. V. Nesvizhevsky, G. Pignol, S. Roccia, J. -P. Scordillis

Abstract: The study of the properties of the quantum states of bouncing neutrons requires position sensitive detection with micro-metric spatial resolution. The UCNBoX detector relies on Charge Coupled Devices (CCD) coated with a thin boron-10 conversion layer to detect neutron hits. In this paper, we present an original experimental method to determine the spatial resolution of this device using micrometri… ▽ More The study of the properties of the quantum states of bouncing neutrons requires position sensitive detection with micro-metric spatial resolution. The UCNBoX detector relies on Charge Coupled Devices (CCD) coated with a thin boron-10 conversion layer to detect neutron hits. In this paper, we present an original experimental method to determine the spatial resolution of this device using micrometric masks. The observed resolution is $2.0\pm0.3~μ$m. △ Less

Submitted 17 March, 2022; originally announced March 2022.

Comments: 4 pages, 4 figure Vienna Conference on Instrumentation 2022

Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment

Authors: C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, E. Chanel, P. -J. Chiu, B. Clément, C. B. Crawford, M. Daum, S. Emmenegger, L. Ferraris-Bouchez, M. Fertl, P. Flaux, A. Fratangelo, W. C. Griffith, Z. D. Grujić, P. G. Harris, L. Hayen, N. Hild, M. Kasprzak, K. Kirch, P. Knowles, H. -C. Koch , et al. (28 additional authors not shown)

Abstract: Experiments dedicated to the measurement of the electric dipole moment of the neutron require outstanding control of the magnetic field uniformity. The neutron electric dipole moment (nEDM) experiment at the Paul Scherrer Institute uses a 199Hg co-magnetometer to precisely monitor magnetic field variations. This co-magnetometer, in the presence of field non-uniformity, is responsible for the large… ▽ More Experiments dedicated to the measurement of the electric dipole moment of the neutron require outstanding control of the magnetic field uniformity. The neutron electric dipole moment (nEDM) experiment at the Paul Scherrer Institute uses a 199Hg co-magnetometer to precisely monitor magnetic field variations. This co-magnetometer, in the presence of field non-uniformity, is responsible for the largest systematic effect of this measurement. To evaluate and correct that effect, offline measurements of the field non-uniformity were performed during mapping campaigns in 2013, 2014 and 2017. We present the results of these campaigns, and the improvement the correction of this effect brings to the neutron electric dipole moment measurement. △ Less

Submitted 3 May, 2022; v1 submitted 16 March, 2021; originally announced March 2021.

Measurement of the permanent electric dipole moment of the neutron

Authors: C. Abel, S. Afach, N. J. Ayres, C. A. Baker, G. Ban, G. Bison, K. Bodek, V. Bondar, M. Burghoff, E. Chanel, Z. Chowdhuri, P. -J. Chiu, B. Clement, C. B. Crawford, M. Daum, S. Emmenegger, L. Ferraris-Bouchez, M. Fertl, P. Flaux, B. Franke, A. Fratangelo, P. Geltenbort, K. Green, W. C. Griffith, M. van der Grinten , et al. (59 additional authors not shown)

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 (UCN). 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 Hg-19… ▽ More 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 (UCN). 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 Hg-199 co-magnetometer 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 $d_{\rm n} = (0.0\pm1.1_{\rm stat}\pm0.2_{\rm sys})\times10^{-26}e\,{\rm cm}$. △ Less

Submitted 31 January, 2020; originally announced January 2020.

Comments: 5 pages, 4 figures, submitted to PRL on 18.12.2019

Journal ref: Phys. Rev. Lett. 124, 081803 (2020)

The n2EDM experiment at the Paul Scherrer Institute

Authors: C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, E. Chanel, P. -J. Chiu, B. Clement, C. Crawford, M. Daum, S. Emmenegger, P. Flaux, L. Ferraris-Bouchez, W. C. Griffith, Z. D. Grujić, P. G. Harris, W. Heil, N. Hild, K. Kirch, P. A. Koss, A. Kozela, J. Krempel, B. Lauss, T. Lefort , et al. (23 additional authors not shown)

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… ▽ More 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. △ Less

Submitted 27 February, 2019; v1 submitted 6 November, 2018; originally announced November 2018.

Comments: Submitted as a web of conference proceedings paper

Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics

Authors: The ATLAS Collaboration, G. Aad, E. Abat, B. Abbott, J. Abdallah, A. A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, M. Abolins, H. Abramowicz, B. S. Acharya, D. L. Adams, T. N. Addy, C. Adorisio, P. Adragna, T. Adye, J. A. Aguilar-Saavedra, M. Aharrouche, S. P. Ahlen, F. Ahles, A. Ahmad, H. Ahmed, G. Aielli, T. Akdogan , et al. (2587 additional authors not shown)

Abstract: A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on… ▽ More A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN. △ Less

Submitted 14 August, 2009; v1 submitted 28 December, 2008; originally announced January 2009.