Project

Back to overview

Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer - Follow-up application

English title Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer - Follow-up application
Applicant Zsigmond Geza
Number 144473
Funding scheme Project funding (Div. I-III)
Research institution Labor für Teilchenphysik Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Particle Physics
Start/End 01.10.2012 - 30.09.2014
Approved amount 384'155.00
Show all

Keywords (4)

neutron electric dipole moment; polarization analysis; ultracold neutrons; Monte Carlo simulations

Lay Summary (English)

Lead
Lay summary
ecm are considered to be of top priority by the particle physics community. Measurements below the current best measurement performed by the RAL-Sussex-ILLGrenoble collaboration may provide information on new sources of charge-parity (CP) violation, for a long time considered to be a fundamental symmetry of nature. Furthermore they may give clues as to the presence of phenomena not explained by the Standard Model of particle physics. An improved nEDM measurement is very timely and complements direct searches for New Physics at the Large Hadron Collider. A new nEDM experiment will need better statistics, and the ultracold neutron (UCN) source at the Paul Scherrer Institut (PSI) was designed to fulfil this condition. It will also need improved control of systematic effects influencing the measurment, mainly related to magnetic field issues, which will be addressed at PSI with new developments in magnetometry. Goal of this proposal is to make an analysis of the first nEDM data aiming at a factor five improvement in precision over the present best result. Additionally, we want to install a new laser based read-out light source for the mercury co-magnetometer which helps to reduce some systematic uncertainties on the nEDM.^-26Measurements of the electric dipole moment of the neutron (nEDM) with sensitivities better than 10
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Copper coated carbon fiber reinforced plastics for high and ultra high vacuum applications
Burri F., Fertl M., Feusi P., Henneck R., Kirch K., Lauss B., Ruetimann P., Schmidt-Wellenburg P., Schnabel A., Voigt J., Zenner J., Zsigmond G. (2014), Copper coated carbon fiber reinforced plastics for high and ultra high vacuum applications, in VACUUM, 101, 212-216.
Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute
Afach S., Bison G., Bodek K., Burri F., Chowdhuri Z., Daum M., Fertl M., Franke B., Grujic Z., Helaine V., Henneck R., Kasprzak M., Kirch K., Koch H. -C., Kozela A., Krempel J., Lauss B., Lefort T., Lemiere Y., Meier M., Naviliat-Cuncic O., Piegsa F. M., Pignol G., Plonka-Spehr C., Prashanth P. N. (2014), Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute, in JOURNAL OF APPLIED PHYSICS, 116(8), 84510.
Experimental study of Hg-199 spin anti-relaxation coatings
Chowdhuri Z., Fertl M., Horras M., Kirch K., Krempel J., Lauss B., Mtchedlishvili A., Rebreyend D., Roccia S., Schmidt-Wellenburg P., Zsigmond G. (2014), Experimental study of Hg-199 spin anti-relaxation coatings, in APPLIED PHYSICS B-LASERS AND OPTICS, 115(2), 257-262.
An endoscopic detector for ultracold neutrons
Goeltl L., Chowdhuri Z., Fertl M., Gray F., Henneck R., Kirch K., Lauss B., Lefort T., Mtchedlishvili A., Schmidt-Wellenburg P., Zsigmond G. (2013), An endoscopic detector for ultracold neutrons, in EUROPEAN PHYSICAL JOURNAL A, 49(1), 9.

Collaboration

Group / person Country
Types of collaboration
KUL, Katholieke Universiteit, Leuven Belgium (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
LPC, Laboratoire de Physique Corpusculaire, Caen France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
CSNSM, Centre de Spectrométrie Nucléaire et de Spectrométrie deMasse, Orsay France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
GUM, Institut für Physik, Gutenberg Universität, Mainz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
BMZ, Biomagnetisches Zentrum, Jena Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
JINR, Joint Institute for Nuclear Research, Dubna Russia (Europe)
- in-depth/constructive exchanges on approaches, methods or results
LPSC, Laboratoire de Physique Subatomique et de Cosmologie, Grenoble France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
JUC, Jagellonian University, Cracow Poland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
ETHZ, Eidgenössische Technische Hochschule Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
FRAP, Université de Fribourg, Fribourg Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
IKC, Institut für Kernchemie, Gutenberg Universität, Mainz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
HNI, Henryk Niedwodniczanski Institute of Nuclear Physics PAN Poland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
PTB, Physikalisch Technische Bundesanstalt, Berlin Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Awards

Title Year
CHIPP Prize 2013 2013

Associated projects

Number Title Start Funding scheme
149211 Measurement of the neutron electric dipole moment 01.11.2013 Project funding (Div. I-III)
162574 Measurement of the neutron electric dipole moment 01.11.2015 Project funding (Div. I-III)
150651 A mobile Raman spectrometer to determine the spin population of deuterium gas 01.12.2013 R'EQUIP
169596 Spin-spectroscopy with ultracold neutrons - Searching for dark matter and lorentz violation using spin-precessing neutrons 01.09.2017 Project funding (Div. I-III)
157079 Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer - Follow-up application II. 01.10.2014 Project funding (Div. I-III)
126562 Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer 01.10.2009 Project funding (Div. I-III)
126562 Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer 01.10.2009 Project funding (Div. I-III)
163413 Improving ultracold neutron intensities for frontier precision experiments in fundamental physics 01.11.2015 Project funding (Div. I-III)
157079 Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer - Follow-up application II. 01.10.2014 Project funding (Div. I-III)
163988 New magnetometer array for the n2EDM project 01.07.2015 International short research visits
188700 A new search for an electric dipole moment of the neutron with increased sensitivity and an improved UCN source. 01.09.2020 Project funding (Div. I-III)
137664 Pushing the high intensity frontier for ultracold neutrons 01.11.2011 Project funding (Div. I-III)
148659 Cross - collaborative exchange for design methods for magentic field coils of nEDM experiments 01.05.2013 International short research visits
172626 Highly accurate vector gradiometers for a next-generation neutron EDM experiment 01.08.2017 Project funding (Div. I-III)
149813 Pushing the high intensity frontier with ultracold neutrons 01.11.2013 Project funding (Div. I-III)

Abstract

Searches for a permanent neutron Electric Dipole Moment (nEDM) with sensitivities better than 10^-26 ecm are considered to be top priority by the particle physics community, since they could reveal new sources of CP violation as predicted by theoretical models beyond the Standard Model. A new improved nEDM measurement is very timely because it can complement results expected from other projects, e.g. concerning SUSY predictions, such as the experiments at the Large Hadron Collider. The importance of seeking a non-zero nEDM is reflected by the existence of at least four competing collaborations in Europe and overseas.An improved nEDM experiment needs much higher neutron statistics, and our project takes place at the newly commissioned ultracold neutron (UCN) source at the Paul Scherrer Institut (PSI). The improved control of systematic effects, matching the foreseen higher statistical sensitivity is addressed by new advances in magnetometry and in the magnetic field control. Our international collaboration involving 14 European research institutes and universities aims in a first step (2012-2014) at a sensitivity improved by more than a factor of five over the present best limit, 2.9x10^-26 ecm (90% C.L.), either improving the limit to 5x10^-27 ecm (95% C.L.) or discovering a non-zero nEDM with 5sigma confidence down to 1.3x10^-26 ecm. Goal of this follow-up proposal is - now that the commissioning of the PSI UCN source and of the upgraded nEDM apparatus has been recently completed - to concentrate on a regular data taking and data reduction project phase, with emphasis on a precise control and determination of systematic uncertainties. We here ask for funding of a PhD position and a postdoc position for two years. Both will be members of the PSI UCN-Physics group and will play a crucial role in the success and the timely realization of the nEDM project. Besides key roles in data taking and data analysis (ideally the Postdoc will have experience in high-precision particle physics analysis and leadership skills to coordinate nEDM data-analysis efforts) it is planned to continue two important hardware-developments: One connected to the crucial mercury magnetometer and the other one to the simultaneous spin detection of UCN after the Ramsey cycle. The postdoctoral fellow will continue our engagement in the simultaneous spin analysis detector especially with a new diamond coated UCN vessel, its complex mechanical design and its implementation in the experiment. The PhD student will continue the development of the new laser read-out mercury co-magnetometer for improved sensitivity and in order to diminish light-shift, as an important systematic effect. It will be tested and potentially run in the current nEDM experiment and optimized for its use in the next step. The academic supervisor for the PhD student will be Prof. Dr. Klaus Kirch, ETH Zürich.
-