Project

Back to overview

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

English title Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer
Applicant Zsigmond Geza
Number 126562
Funding scheme Project funding (Div. I-III)
Research institution Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Particle Physics
Start/End 01.10.2009 - 30.09.2012
Approved amount 428'937.00
Show all

Keywords (4)

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

Lay Summary (English)

Lead
Lay summary
Context and relevance of the project:Measurements of the neutron Electric Dipole Moment (nEDM) with sensitivities better than 10^-26 e.cm are considered to be of top priority by the particle physics community, since they may provide information on new sources of CP violation and thus give clues as to the presence of physics beyond the Standard Model. An improved nEDM measurement is timely and will complement results expected from other projects, e.g. concerning supersymmetry signatures, such as experiments at the Large Hadron Collider (CERN) or searches for forbidden lepton-flavour changing processes such as the MEG experiment at the Paul Scherrer Institut (PSI).Goals of the project:Goal of this project is, after installation of the improved nEDM apparatus of the previous Sussex-ILL-Grenoble collaboration at the PSI ultracold neutron (UCN) source, to make an analysis of the first data aiming at a factor five improvement in precision over the present best result. Additionally, we want to develop a fast detector (fit for rates up to 10^7 UCN/s) and a double arm counting system. These improvements add important ingredients to increase the statistical and systematic sensitivity necessary for a nEDM search.Framework and methods:An improved nEDM experiment will need better statistics, a prerequisite which will be fulfilled at the new ultracold neutron source at the Paul Scherrer Institut.It will also need improved control of systematic effects, mainly related to magnetic field issues, which will be addressed at PSI with improved magnetometry. As a first step in the PSI nEDM program, an international collaboration aims at a measurement with a factor of five improved sensitivity over the present best limit 2.9 x 10^-26 e.cm (90% C.L.). This will be possible with (i) an upgraded and improved nEDM spectrometer, which was originally used for the measurement of the present best limit and was transferred from ILL-Grenoble to PSI in Spring 2009, (ii) the large gain in UCN density expected for the new PSI UCN source (gain factor 50) and (iii) improved control of systematics.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
MC calculations for the nEDM experiment systematics
Bodek K, Chowdhuri Z, Daum M, Fertl M, Franke B, Gutsmiedl E, Henneck R, Horras M, Kasprzak M, Kirch K, Kistryn S, Kozela A, Krempel J, Lauss B, Mtchedlishvili A, Piegsa F, Pignol G, Rebreyend D, Roccia S, Schmidt-Wellenburg P, Zejma J, Zenner J, Zsigmond G (2011), MC calculations for the nEDM experiment systematics, in 2nd International Workshop on the Physics of fundamental Symmetries and Interactions - PSI2010, Elsevier, Amsterdam.
Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins
Altarev I, Ban G, Bison G, Bodek K, Daum M, Fertl M, Fierlinger P, Franke B, Gutsmiedl E, Heil W, Henneck R, Horras M, Khomutov N, Kirch K, Kistryn S, Kraft A, Knecht A, Knowles P, Kozela A, Lauer T, Lauss B, Lefort T, Lemiere Y, Mtchedlishvili A, Naviliat-Cuncic O (2011), Testing isotropy of the universe using the Ramsey resonance technique on ultracold neutron spins, in Proceedings of the 8th International Workshop on Polarised Neutrons for Condensed Matter Investigati, Elsevier, Amsterdam.
The search for the neutron electric dipole moment at the Paul Scherrer Institute
Baker CA, Ban G, Bodek K, Burghoff M, Chowdhuri Z, Daum M, Fertl M, Franke B, Geltenbort P, Green K, van der Grinten MGD, Gutsmiedl E, Harris PG, Henneck R, Iaydjiev P, Ivanov SN, Khomutov N, Kasprzak M, Kirch K, Kistryn S, Knappe-Gruneberg S, Knecht A, Knowles P, Kozela A, Lauss B (2011), The search for the neutron electric dipole moment at the Paul Scherrer Institute, in 2nd International Workshop on the Physics of fundamental Symmetries and Interactions - PSI2010, Elsevier, Amsterdam.
An improved measurement of the electric dipole moment of the neutron
Altarev I, Ban G, Bison G, Bodek K, Burghoff M, Chowdhuri Z, Daum M, Dusing C, Fertl M, Fierlinger P, Franke B, Grab C, Gutsmiedl E, Hampel G, Heil W, Henneck R, Horras M, Khomutov N, Kirch K, Kistryn S, Knappe-Gruneberg S, Knecht A, Knowles P, Kozela A, Kraft A (2010), An improved measurement of the electric dipole moment of the neutron, in Proceedings of the 4th International Symposium on Symmetries in Subatomic Physics, TaipeiElsevier, Taipei.
New constraints on Lorentz invariance violation from the neutron electric dipole moment
Altarev I, Baker CA, Ban G, Bodek K, Daum M, Fertl M, Franke B, Fierlinger P, Geltenbort P, Green K, van der Grinten MGD, Harris PG, Henneck R, Horras M, Iaydjiev P, Ivanov SN, Khomutov N, Kirch K, Kistryn S, Knecht A, Kozela A, Kuchler F, Lauss B, Lefort T, Lemiere Y (2010), New constraints on Lorentz invariance violation from the neutron electric dipole moment, in EPL, 92(5), 51001-p1-51001-p5.

Collaboration

Group / person Country
Types of collaboration
University Fribourg Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
LPC Caen France (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
44th Conference of the European Group for Atomic Systems 2012 Poster A UV frequency-quadrupled diode laser system for the mercury comagnetometer in the nEDM experiment 09.07.2012 Gothenburg, Sweden Fertl Martin;
Annual meeting of the SPS 2012 Talk given at a conference Improvements of the Hg cohabiting magnetometer for the nEDM experiment at PSI 21.06.2012 Zürich, Switzerland Fertl Martin;
DPG spring meeting 2012 Talk given at a conference Progress report on the nEDM project at the Paul Scherrer Institut, Switzerland 19.03.2012 Mainz, Germany Fertl Martin;
Physics of fundamental Symmetries and Interactions 2010 Talk given at a conference The search for the neutron electric dipole moment at the Paul Scherrer Institute 11.10.2011 PSI, Switzerland Fertl Martin; Chowdhuri Zema; Zsigmond Geza; Krempel Jochen; Kirch Klaus; Lauss Bernhard; Henneck Reinhold;
43rd Congress of the European Group on Atomic Systems 2011 Poster Improvements of the Hg cohabiting magnetometer for the nEDM experiment at PSI 28.06.2011 Fribourg, Switzerland Fertl Martin;
Joint annual meeting of the SPS 2011 Talk given at a conference Improvements of the Hg cohabiting magnetometer for the nEDM experiment 15.06.2011 Lausanne, Switzerland Chowdhuri Zema; Fertl Martin;
DPG spring meeting 2011 Talk given at a conference Recent improvements of the Hg cohabiting magnetometer for the nEDM experiment at PSI 21.03.2011 Münster, Germany Fertl Martin;
4th International Symposium on LEPTON MOMENTS 2010 Talk given at a conference Search for an EDM of the neutron at PSI 19.07.2010 Centerville, Cape Cod, MA , United States of America Lauss Bernhard; Zsigmond Geza; Henneck Reinhold; Fertl Martin; Chowdhuri Zema; Krempel Jochen; Kirch Klaus;
Annual meeting of the SPS 2010 Talk given at a conference Laser-driven optically-pumped Cs magnetometer array for a nEDM experiment 21.06.2010 Basel, Switzerland Fertl Martin;
DPG spring meeting 2010 Talk given at a conference Laser-driven optically-pumped Cs magnetometer array for a nEDM experiment 15.03.2010 Bonn, Germany Fertl Martin;


Awards

Title Year
The CHIPP Prize for the best PhD student in experimental or theoretical particle physics 2013

Associated projects

Number Title Start Funding scheme
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)
150651 A mobile Raman spectrometer to determine the spin population of deuterium gas 01.12.2013 R'EQUIP
138211 Measurement of the neutron electric dipole moment 01.11.2011 Project funding (Div. I-III)
144473 Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer - Follow-up application 01.10.2012 Project funding (Div. I-III)
137664 Pushing the high intensity frontier for ultracold neutrons 01.11.2011 Project funding (Div. I-III)
144473 Search for the neutron EDM at the high intensity ultracold neutron source at PSI with an upgraded high sensitivity spectrometer - Follow-up application 01.10.2012 Project funding (Div. I-III)
139140 Passive magnetic shield for the new neutron electric dipole moment experiment n2EDM 01.01.2013 R'EQUIP

Abstract

Measurements of the neutron Electric Dipole Moment (nEDM) with sensitivities better than 10^-26 e.cm are considered to be of top priority by the particle physics community, since they may provide information on new sources of CP violation and give clues as to the presence of physics beyond the Standard Model. An improved nEDM measurement is timely and will complement results expected from other projects, e.g. concerning supersymmetry signatures, such as experiments at the Large Hadron Collider or searches for forbidden lepton-flavour changing processes such as the MEG experiment at PSI. An improved nEDM experiment will need better statistics, a prerequisite which will be fulfilled at the new ultracold neutron (UCN) source at the Paul Scherrer Institut (PSI). It will also need improved control of systematic effects, mainly related to magnetic field issues, which will be addressed at PSI with improved magnetometry. As a first step in the PSI nEDM program, an international collaboration aims at a measurement with a factor of five improved sensitivity over the present best limit 2.9 x 10^-26 e.cm (90% C.L.). This will be possible with (i) an upgraded and improved nEDM spectrometer, which was originally used for the measurement of the present best limit and is transferred from ILL to PSI in Spring 2009, (ii) the large gain in UCN density expected for the new PSI UCN source (gain factor 50) and (iii) improved control of systematics.Goal of this proposal is, after installation of the improved nEDM apparatus at the PSI UCN source, to make an analysis of the first data aiming at a factor five improvement in precision over the present best result. Additionally, we want to develop a fast detector (fit for rates up to 10^7 UCN/s) and a double arm counting system. These improvements add important ingredients to increase the statistical and systematic sensitivity necessary for a nEDM search.In the present proposal we ask for funding of a PhD position for three years and for a postdoc position for two years. Both will play a very important role in the timely realization of the nEDM project. The postdoc is expected to bring additional experience in high-precision particle physics analysis. The academic supervisor for the PhD student will be Prof. Dr. G. Dissertori, ETH Zürich.
-