Showing 1–16 of 16 results for author: Chanel, E

Ultracold neutron energy spectrum and storage properties from magnetically induced spin depolarization

Authors: N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, T. Bouillaud, D. Bowles, G. L. Caratsch, E. Chanel, W. Chen, P. -J. Chiu, C. B. Crawford, V. Czamler, M. Daum, C. B. Doorenbos, M. Ferry, M. Fertl, A. Fratangelo, D. Galbinski, W. C. Griffith, Z. D. Grujic, K. Kirch, V. Kletzl, B. Lauss, T. Lefort , et al. (31 additional authors not shown)

Abstract: We present a novel method for extracting the energy spectrum of ultracold neutrons from magnetically induced spin depolarization measurements using the n2EDM apparatus. This method is also sensitive to the storage properties of the materials used to trap ultracold neutrons, specifically, whether collisions are specular or diffuse. We highlight the sensitivity of this new technique by comparing the… ▽ More We present a novel method for extracting the energy spectrum of ultracold neutrons from magnetically induced spin depolarization measurements using the n2EDM apparatus. This method is also sensitive to the storage properties of the materials used to trap ultracold neutrons, specifically, whether collisions are specular or diffuse. We highlight the sensitivity of this new technique by comparing the two different storage chambers of the n2EDM experiment. We validate the extraction by comparing to an independent measurement for how this energy spectrum is polarized through a magnetic-filter, and finally, we calculate the neutron center-of-mass offset, an important systematic effect for measurements of the neutron electric dipole moment. △ Less

Submitted 10 November, 2025; originally announced November 2025.

High-Density Ultracold Neutron Source for Low-Energy Particle Physics Experiments

Authors: Skyler Degenkolb, Estelle Chanel, Simon Baudoin, Marie-Hélène Baurand, Douglas H. Beck, Juliette Blé, Eric Bourgeat-Lami, Zeus Castillo, Hanno Filter, Maurits van der Grinten, Tobias Jenke, Michael Jentschel, Victorien Joyet, Eddy Lelièvre-Berna, Husain Manasawala, Thomas Neulinger, Peter Fierlinger, Kseniia Svirina, Xavier Tonon, Oliver Zimmer

Abstract: SuperSUN, a new superthermal source of ultracold neutrons (UCN) at the Institut Laue-Langevin, exploits inelastic scattering of neutrons in isotopically pure superfluid $^4$He at temperatures below $0.6\,$K. For the first time, continuous operation with an intense broad-spectrum cold neutron beam is demonstrated over 60 days. We observe continuous UCN extraction rates of $21000\,$s$^{-1}$, and sto… ▽ More SuperSUN, a new superthermal source of ultracold neutrons (UCN) at the Institut Laue-Langevin, exploits inelastic scattering of neutrons in isotopically pure superfluid $^4$He at temperatures below $0.6\,$K. For the first time, continuous operation with an intense broad-spectrum cold neutron beam is demonstrated over 60 days. We observe continuous UCN extraction rates of $21000\,$s$^{-1}$, and storage in the source with saturated $\textit{in-situ}$ density $273\,$cm$^{-3}$. The high stored density, low-energy UCN spectrum, and long storage times open new possibilities in fundamental and applied physics. △ Less

Submitted 17 April, 2025; originally announced April 2025.

Comments: 6 pages, 5 figures

Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments

Authors: N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, T. Bouillaud, D. Bowles, E. Chanel, W. Chen, P. -J. Chiu, C. B. Crawford, O. Naviliat-Cuncic, C. B. Doorenbos, S. Emmenegger, M. Fertl, A. Fratangelo, W. C. Griffith, Z. D. Grujic, P. G. Harris, K. Kirch, V. Kletzl, J. Krempel, B. Lauss, T. Lefort, A. Lejuez , et al. (25 additional authors not shown)

Abstract: High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present the final degaussing configuration that will be used for n2EDM after numerous studies. The optim… ▽ More High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present the final degaussing configuration that will be used for n2EDM after numerous studies. The optimized procedure results in a residual magnetic field that has been reduced by a factor of two. The ultra-low field is achieved with the full magnetic-field-coil system, and a large vacuum vessel installed, both in the MSR. In the inner volume of ~1.4 m^3, the field is now more uniform and below 300 pT. In addition, the procedure is faster and dissipates less heat into the magnetic environment, which in turn, reduces its thermal relaxation time from 12 h down to ~1.5 h. △ Less

Submitted 28 September, 2023; originally announced September 2023.

A large 'Active Magnetic Shield' for a high-precision experiment

Authors: C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, T. Bouillaud, E. Chanel, J. Chen, W. Chen, P. -J. Chiu, C. B. Crawford, M. Daum, C. B. Doorenbos, S. Emmenegger, L. Ferraris-Bouchez, M. Fertl, A. Fratangelo, W. C. Griffith, Z. D. Grujic, P. Harris, K. Kirch, V. Kletzl, P. A. Koss, J. Krempel , et al. (26 additional authors not shown)

Abstract: We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field stability and control is of key importance for n2EDM. A large, cubic, 5m side length, magnetically shielded room (MSR) provides a passive, quasi-static s… ▽ More We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field stability and control is of key importance for n2EDM. A large, cubic, 5m side length, magnetically shielded room (MSR) provides a passive, quasi-static shielding-factor of about 10^5 for its inner sensitive volume. The AMS consists of a system of eight complex, feedback-controlled compensation coils constructed on an irregular grid spanned on a volume of less than 1000m^3 around the MSR. The AMS is designed to provide a stable and uniform magnetic-field environment around the MSR, while being reasonably compact. The system can compensate static and variable magnetic fields up to +-50muT (homogeneous components) and +-5muT (first-order gradients), suppressing them to a few muT in the sub-Hertz frequency range. The presented design concept and implementation of the AMS fulfills the requirements of the n2EDM experiment and can be useful for other applications, where magnetically silent environments are important and spatial constraints inhibit simpler geometrical solutions. △ Less

Submitted 14 July, 2023; originally announced July 2023.

Resonant Cancellation Effect in Ramsey Experiments

Authors: Ivo Schulthess, Ivan Calic, Estelle Chanel, Anastasio Fratangelo, Philipp Heil, Christine Klauser, Gjon Markaj, Marc Persoz, Ciro Pistillo, Jacob Thorne, Florian M. Piegsa

Abstract: We investigate the response of a Ramsey-type experiment on an additional oscillating magnetic field. This superimposed field is oriented in the same direction as the static main magnetic field and causes a modulation of the original Larmor spin precession frequency. The observable magnitude of this modulation reduces at higher frequencies of the oscillating field. It disappears completely if the i… ▽ More We investigate the response of a Ramsey-type experiment on an additional oscillating magnetic field. This superimposed field is oriented in the same direction as the static main magnetic field and causes a modulation of the original Larmor spin precession frequency. The observable magnitude of this modulation reduces at higher frequencies of the oscillating field. It disappears completely if the interaction time of the particles matches the oscillation period, which we call resonant cancellation. We present an analytical approach that describes the effect and compare it to a measurement using a monochromatic cold neutron beam. △ Less

Submitted 16 June, 2023; originally announced June 2023.

Search for ultralight axion dark matter in a side-band analysis of a 199Hg free-spin precession signal

Authors: C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, E. Chanel, C. B. Crawford, M. Daum, B. Dechenaux, S. Emmenegger, P. Flaux, W. C. Griffith, P. G. Harris, Y. Kermaidic, K. Kirch, S. Komposch, P. A. Koss, J. Krempel, B. Lauss, T. Lefort, O. Naviliat-Cuncic, P. Mohanmurthy, D. Pais, F. M. Piegsa , et al. (13 additional authors not shown)

Abstract: Ultra-low-mass axions are a viable dark matter candidate and may form a coherently oscillating classical field. Nuclear spins in experiments on Earth might couple to this oscillating axion dark-matter field, when propagating on Earth's trajectory through our Galaxy. This spin coupling resembles an oscillating pseudo-magnetic field which modulates the spin precession of nuclear spins. Here we repor… ▽ More Ultra-low-mass axions are a viable dark matter candidate and may form a coherently oscillating classical field. Nuclear spins in experiments on Earth might couple to this oscillating axion dark-matter field, when propagating on Earth's trajectory through our Galaxy. This spin coupling resembles an oscillating pseudo-magnetic field which modulates the spin precession of nuclear spins. Here we report on the null result of a demonstration experiment searching for a frequency modulation of the free spin-precession signal of \magHg in a \SI{1}{\micro\tesla} magnetic field. Our search covers the axion mass range $10^{-16}~\textrm{eV} \lesssim m_a \lesssim 10^{-13}~\textrm{eV}$ and achieves a peak sensitivity to the axion-nucleon coupling of $g_{aNN} \approx 3.5 \times 10^{-6}~\textrm{GeV}^{-1}$. △ Less

Submitted 31 March, 2023; v1 submitted 2 December, 2022; originally announced December 2022.

Comments: 18 pages, 4 images, submitted to SciPost Physics

Journal ref: SciPost Phys. 15, 058 (2023)

Particle Physics at the European Spallation Source

Authors: H. Abele, A. Alekou, A. Algora, K. Andersen, S. Baessler, L. Barron-Palos, J. Barrow, E. Baussan, P. Bentley, Z. Berezhiani, Y. Bessler, A. K. Bhattacharyya, A. Bianchi, J. Bijnens, C. Blanco, N. Blaskovic Kraljevic, M. Blennow, K. Bodek, M. Bogomilov, C. Bohm, B. Bolling, E. Bouquerel, G. Brooijmans, L. J. Broussard, O. Buchan , et al. (154 additional authors not shown)

Abstract: Presently under construction in Lund, Sweden, the European Spallation Source (ESS) will be the world's brightest neutron source. As such, it has the potential for a particle physics program with a unique reach and which is complementary to that available at other facilities. This paper describes proposed particle physics activities for the ESS. These encompass the exploitation of both the neutrons… ▽ More Presently under construction in Lund, Sweden, the European Spallation Source (ESS) will be the world's brightest neutron source. As such, it has the potential for a particle physics program with a unique reach and which is complementary to that available at other facilities. This paper describes proposed particle physics activities for the ESS. These encompass the exploitation of both the neutrons and neutrinos produced at the ESS for high precision (sensitivity) measurements (searches). △ Less

Submitted 30 January, 2024; v1 submitted 18 November, 2022; originally announced November 2022.

Comments: 121 pages, updated version after referee comments

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

New Limit on Axion-Like Dark Matter using Cold Neutrons

Authors: Ivo Schulthess, Estelle Chanel, Anastasio Fratangelo, Alexander Gottstein, Andreas Gsponer, Zachary Hodge, Ciro Pistillo, Dieter Ries, Torsten Soldner, Jacob Thorne, Florian M. Piegsa

Abstract: We report on a search for dark matter axion-like particles (ALPs) using a Ramsey-type apparatus for cold neutrons. A hypothetical ALP-gluon-coupling would manifest in a neutron electric dipole moment signal oscillating in time. Twenty-four hours of data have been analyzed in a frequency range from 23 $μ$Hz to 1 kHz, and no significant oscillating signal has been found. The usage of present dark-ma… ▽ More We report on a search for dark matter axion-like particles (ALPs) using a Ramsey-type apparatus for cold neutrons. A hypothetical ALP-gluon-coupling would manifest in a neutron electric dipole moment signal oscillating in time. Twenty-four hours of data have been analyzed in a frequency range from 23 $μ$Hz to 1 kHz, and no significant oscillating signal has been found. The usage of present dark-matter models allows to constrain the coupling of ALPs to gluons in the mass range from $10^{-19}$ to $4 \times 10^{-12}$ eV. The best limit of $C_G$/$f_a m_a = 2.7 \times 10^{13}$ GeV$^{-2}$ (95% C.L.) is reached in the mass range from $2 \times 10^{-17}$ to $2 \times 10^{-14}$ eV. △ Less

Submitted 16 July, 2022; v1 submitted 4 April, 2022; originally announced April 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)

Data blinding for the nEDM experiment at PSI

Authors: N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, E. Chanel, P. -J. Chiu, C. Crawford, M. Daum, S. Emmenegger, L. Ferraris-Bouchez, P. Flaux, P. G Harris, Z. Grujić, N. Hild, J. Hommet, B. Lauss, T. Lefort, Y. Lemiere, M. Kasprzak, Y. Kermaidic, K. Kirch, S. Komposch, A. Kozela, J. Krempel , et al. (20 additional authors not shown)

Abstract: Psychological bias towards, or away from, a prior measurement or a theory prediction is an intrinsic threat to any data analysis. While various methods can be used to avoid the bias, e.g. actively not looking at the result, only data blinding is a traceable and thus trustworthy method to circumvent the bias and to convince a public audience that there is not even an accidental psychological bias.… ▽ More Psychological bias towards, or away from, a prior measurement or a theory prediction is an intrinsic threat to any data analysis. While various methods can be used to avoid the bias, e.g. actively not looking at the result, only data blinding is a traceable and thus trustworthy method to circumvent the bias and to 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, as several cross measurements, in particular of the magnetic field, create a self-consistent network into which it is hard to inject a fake 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 of each measurement cycle. The flexible algorithm is applied twice to the data, to provide different data to various analysis teams. This gives us the option to sequentially apply various blinding offsets for separate analysis steps with independent teams. The subtle modification of the data allows us to modify the algorithm and to produce a re-blinded data set without revealing the blinding secret. 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 efforts. △ Less

Submitted 5 October, 2020; v1 submitted 19 December, 2019; originally announced December 2019.

Optically Pumped Cs Magnetometers Enabling a High-Sensitivity Search for the Neutron Electric Dipole Moment

Authors: C. Abel, S. Afach, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, E. Chanel, P. -J. Chiu, C. B. Crawford, Z. Chowdhuri, M. Daum, S. Emmenegger, L. Ferraris-Bouchez, M. Fertl, B. Franke, W. C. Griffith, Z. D. Grujić, L. Hayen, V. Hélaine, N. Hild, M. Kasprzak, Y. Kermaidic, K. Kirch, P. Knowles , et al. (35 additional authors not shown)

Abstract: An array of sixteen laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's magnetic field and to monitor their temporal evolution. The originality of the array lies in its compact design, in which a single near-infrared diode laser… ▽ More An array of sixteen laser-pumped scalar Cs magnetometers was part of the neutron electric dipole moment (nEDM) experiment taking data at the Paul Scherrer Institute in 2015 and 2016. It was deployed to measure the gradients of the experiment's magnetic field and to monitor their temporal evolution. The originality of the array lies in its compact design, in which a single near-infrared diode laser drives all magnetometers that are located in a high-vacuum chamber, with a selection of the sensors mounted on a high-voltage electrode. We describe details of the Cs sensors' construction and modes of operation, emphasizing the accuracy and sensitivity of the magnetic field readout. We present two applications of the magnetometer array directly beneficial to the nEDM experiment: (i) the implementation of a strategy to correct for the drift of the vertical magnetic field gradient and (ii) a procedure to homogenize the magnetic field. The first reduces the uncertainty of the new nEDM result. The second enables transverse neutron spin relaxation times exceeding 1500 s, improving the statistical sensitivity of the nEDM experiment by about 35% and effectively increasing the rate of nEDM data taking by a factor of 1.8. △ Less

Submitted 28 April, 2020; v1 submitted 10 December, 2019; originally announced December 2019.

Journal ref: Phys. Rev. A 101, 053419 (2020)

The Pulsed Neutron Beam EDM Experiment

Authors: E. Chanel, Z. Hodge, D. Ries, I. Schulthess, M. Solar, T. Soldner, O. Stalder, J. Thorne, F. M. Piegsa

Abstract: We report on the Beam EDM experiment, which aims to employ a pulsed cold neutron beam to search for an electric dipole moment instead of the established use of storable ultracold neutrons. We present a brief overview of the basic measurement concept and the current status of our proof-of-principle Ramsey apparatus. We report on the Beam EDM experiment, which aims to employ a pulsed cold neutron beam to search for an electric dipole moment instead of the established use of storable ultracold neutrons. We present a brief overview of the basic measurement concept and the current status of our proof-of-principle Ramsey apparatus. △ Less

Submitted 12 March, 2019; v1 submitted 8 December, 2018; originally announced December 2018.

Magnetic field uniformity in neutron electric dipole moment experiments

Authors: C. Abel, N. Ayres, T. Baker, G. Ban, G. Bison, K. Bodek, V. Bondar, C. Crawford, P. -J. Chiu, E. Chanel, Z. Chowdhuri, M. Daum, B. Dechenaux, S. Emmenegger, L. Ferraris-Bouchez, P. Flaux, P. Geltenbort, K. Green, W. C. Griffith, M. van der Grinten, P. G. Harris, R. Henneck, N. Hild, P. Iaydjiev, S. N. Ivanov , et al. (31 additional authors not shown)

Abstract: 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 non-uniformities: depolarization of ultracold neutrons, and Larmor frequency shifts of… ▽ More 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 non-uniformities: 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 nEDM apparatus installed at the Paul Scherrer Institute. △ Less

Submitted 30 August, 2019; v1 submitted 13 November, 2018; originally announced November 2018.

Journal ref: Phys. Rev. A 99, 042112 (2019)

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