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

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 II.
Applicant Zsigmond Geza
Number 157079
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 01.10.2014 - 31.07.2017
Approved amount 214'357.00
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Keywords (3)

ultracold neutrons; high resolution magnetometry; neutron electric dipole moment

Lay Summary (German)

Lead
Verbesserte Sensitivität zu erreichen in der Messung des elektrischen Dipolmomentes des Neutrons wird als hohe Priorität von der Teilchenphysikergemeinschaft gesehen
Lay summary
Messungen des elektrischen Dipolmomentes des Neutrons (nEDM) mit Sensitivität besser als 10 ^ -26 ecm werden als Top-Priorität in der Teilchenphysik betrachtet. Messungen unterhalb der derzeit besten Obergrenze,  erreicht durch die RAL-Sussex-ILL-Grenoble Kollaboration, könnten Informationen über neue Quellen für die Verletzung der Ladungsparitäts-Symmetrie (kurz: CP) , für lange Zeit als grundlegende Symmetrie der Natur gesehen. Darüber hinaus könnten sie Hinweise auf Phänomene geben, die nicht durch das Standardmodell der Teilchenphysik erklärt werden können. Eine verbesserte nEDM Messung wäre sehr aktuell und komplementär zu direkten Suchen nach neuer Physik am Large Hadron Collider. Ein neues nEDM-Experiment wird bessere Neutronen-Statistik benötigen, und die Ultrakalte Neutronen (UCN)-Quelle am Paul Scherrer Institut (PSI) wurde entwickelt, um diese Bedingung zu erfüllen. Eine verbesserte Kontrolle der systematischen Effekte, die die Messung beeinflussen, ist auch notwendig, vor allem bezogen auf das Magnetfeld, eine Aufgabe die am PSI mit neuen Entwicklungen in der Magnetometrie angesprochen wird. Ein Ziel dieses Antrags ist die Analyse der nEDM Daten durchzuführen, die zu einem Faktor fünf Verbesserung der Sensitivität gegenüber dem derzeitigen besten Ergebnis führen sollte. Zusätzlich installieren wir eine neue laser-basierte Ausleselichtquelle für den Quecksilber Co-Magnetometer, um einige systematische Fehlerquellen auf dem nEDM zu verringern.
Direct link to Lay Summary Last update: 07.10.2014

Responsible applicant and co-applicants

Employees

Name Institute

Collaboration

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

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
PSI/LTP Seminar Individual talk The laser-based Hg magnetometer for the nEDM experiment 12.06.2017 PSI, Switzerland Komposch Sybille;
Physics of fundamental Symmetries and Interactions Poster News on the laser based mercury magnetometer for the nEDM experiment at PSI 16.10.2016 PSI, Switzerland Komposch Sybille;
Swiss Physical Society Annual Meeting Poster nEDM experiment at PSI 23.08.2016 Lugano, Switzerland Komposch Sybille;
Challenges of the world-wide experimental search for the electric dipole moment of the neutron Poster A Laser based mercury magnetometer for the nEDM 02.11.2014 Ascona, Switzerland Komposch Sybille;


Associated projects

Number Title Start Funding scheme
172639 Precision Physics with Muons and Ultracold Neutrons 01.05.2017 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)
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)
149813 Pushing the high intensity frontier with ultracold neutrons 01.11.2013 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)

Abstract

Searches for a permanent neutron Electric Dipole Moment (nEDM) with sensitivities better than 10^-26 e·cm are regarded 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 (see e.g. [Rai08], [Dub11]). The goal of our international collaboration currently involving 14 European research institutes and universities is to reach until end of 2016 (end of this requested funding period) a cumulative sensitivity better than 10^-26 e·cm with the present apparatus. The new laser-based 199Hg co-magnetometer proposed in this follow-up application will allow for a significant improvement of the nEDM sensitivity and the reduction of several systematic effects.Here we ask for continuation of funding of a PhD position and a postdoc position for two years. Both will be members of the PSI UCN-Physics group and key figures to the timely realization of the project. The postdoc will have the main task to perform nEDM data analysis and coordinate one of the two independent analysis teams of the collaboration, the one centered at PSI where the nEDM experiment is located. The task of the postdoc will be to contribute substantially to the necessary software design and coding and coordinate the development of analysis algorithms for expert systems. He/she will be the central person to design fitting algorithms to combine the data to one nEDM value including all available information. The PhD student will continue her work on the development, implementation and characterization of a laser-based 199Hg co-magnetometer aiming at improved sensitivity and the reduction of important systematic effects in the nEDM measurement. In addition to the main task, the PhD student will participate in nEDM data taking and analysis. The academic supervisor for the PhD student will be Prof. Dr. Klaus Kirch, ETH Zürich.
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