scholarly journals The design of the n2EDM experiment

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
N. J. Ayres ◽  
G. Ban ◽  
L. Bienstman ◽  
G. Bison ◽  
K. Bodek ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Experimental Method ◽  
Neutron Source ◽  
High Precision ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Technical Design ◽  
Order Of Magnitude ◽  
Under Construction ◽  
Paul Scherrer

AbstractWe present the design of a next-generation experiment, n2EDM, currently under construction at the ultracold neutron source at the Paul Scherrer Institute (PSI) with the aim of carrying out a high-precision search for an electric dipole moment of the neutron. The project builds on experience gained with the previous apparatus operated at PSI until 2017, and is expected to deliver an order of magnitude better sensitivity with provision for further substantial improvements. An overview is of the experimental method and setup is given, the sensitivity requirements for the apparatus are derived, and its technical design is described.

scholarly journals The search for the neutron electric dipole moment at PSI

2021 ◽  
Author(s):  
Guillaume Pignol ◽  
Philipp Schmidt-Wellenburg
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
New Physics ◽  
Permanent Electric Dipole Moment ◽  
Order Of Magnitude ◽  
Under Construction ◽  
Paul Scherrer ◽  
The Universe ◽  
Shed Light

The existence of a nonzero permanent electric dipole moment (EDM) of the neutron would reveal a new source of CP violation and shed light on the origin of the matter–antimatter asymmetry of the Universe. The sensitivity of current experiments using stored ultracold neutrons (UCN) probe new physics beyond the TeV scale. Using the UCN source at the Paul Scherrer Institut, the nEDM collaboration has performed the most sensitive measurement of the neutron EDM to date, still compatible with zero (|d_n|<1.8\times 10^{-26} \, e {cm}|dn|<1.8×10−26ecm, C.L.,90%). A new experiment designed to improve the sensitivity by an order of magnitude, n2EDM, is currently under construction.

Adiabatische Korrektur der Born-Oppenheimer-Näherung beim GeS und GeSe / Adiabatic Correction of the Born-Oppenheimer Approximation for GeS and GeSe

1976 ◽  
Vol 31 (3-4) ◽  
pp. 374-380 ◽  
Author(s):  
W. U. Stieda ◽  
E. Tiemann ◽  
T. Törring ◽  
J. Hoeft
Keyword(s):  
Dipole Moment ◽  
High Precision ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Rotational Constant ◽  
Frequency Range ◽  
Rotational Spectra ◽  
Oppenheimer Approximation

Abstract The rotational spectra of GeS and GeSe were measured in the frequency range of 66 GHz to 110 GHz with high precision. The breakdown of the Born-Oppenheimer approximation was observed for the rotational constant yol. With the known molecular 37-factor and the electric dipole moment the adiabatic part of the Born-Oppenheimer correction can be extracted from the primary observa-tion on y01. The adiabatic correction is very similar in both molecules but differs from the results in the earlier measurements on PbS.

scholarly journals Estimation of Systematic Errors for Deuteron Electric Dipole Moment Search at COSY

2016 ◽  
Vol 40 ◽  
pp. 1660099 ◽  
Author(s):  
Stanislav Chekmenev
Keyword(s):  
Dipole Moment ◽  
Charged Particle ◽  
Experimental Method ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Systematic Errors ◽  
Great Level ◽  
Spin Motion ◽  
Wien Filter ◽  
Systematic Effects

An experimental method which is aimed to find a permanent EDM of a charged particle was proposed by the JEDI (Jülich Electric Dipole moment Investigations) collaboration. EDMs can be observed by their influence on spin motion. The only possible way to perform a direct measurement is to use a storage ring. For this purpose, it was decided to carry out the first precursor experiment at the Cooler Synchrotron (COSY). Since the EDM of a particle violates CP invariance it is expected to be tiny, treatment of all various sources of systematic errors should be done with a great level of precision. One should clearly understand how misalignments of the magnets affects the beam and the spin motion. It is planned to use a RF Wien filter for the precusor experiment. In this paper the simulations of the systematic effects for the RF Wien filter device method will be discussed.

scholarly journals nEDM experiment at PSI: Data-taking strategy and sensitivity of the dataset

2019 ◽  
Vol 219 ◽  
pp. 02001 ◽  
Author(s):  
C. Abel ◽  
N.J. Ayres ◽  
G. Ban ◽  
G. Bison ◽  
K. Bodek ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Neutron Electric Dipole Moment ◽  
Systematic Effects ◽  
Paul Scherrer ◽  
Coherent Picture ◽  
The Magnetic Field ◽  
Better Than

We report on the strategy used to optimize the sensitivity of our search for a neutron electric dipole moment at the Paul Scherrer Institute. Measurements were made upon ultracold neutrons stored within a single chamber at the heart of our apparatus. A mercury cohabiting magnetometer together with an array of cesium magnetometers were used to monitor the magnetic field, which was controlled and shaped by a series of precision field coils. In addition to details of the setup itself, we describe the chosen path to realize an appropriate balance between achieving the highest statistical sensitivity alongside the necessary control on systematic effects. The resulting irreducible sensitivity is better than 1 × 10−26e cm. This contribution summarizes in a single coherent picture the results of the most recent publications of the collaboration.

scholarly journals The PanEDM neutron electric dipole moment experiment at the ILL

2019 ◽  
Vol 219 ◽  
pp. 02006 ◽  
Author(s):  
David Wurm ◽  
Douglas H. Beck ◽  
Tim Chupp ◽  
Skyler Degenkolb ◽  
Katharina Fierlinger ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Damping Factor ◽  
First Order ◽  
Permanent Electric Dipole Moment ◽  
Field Homogeneity ◽  
Order Of Magnitude ◽  
Magnetic Stability ◽  
Magnitude Improvement

The neutron's permanent electric dipole moment dn is constrained to below 3 × 10−26e cm (90% C.L.) [1, 2], by experiments using ultracold neutrons (UCN). We plan to improve this limit by an order of magnitude or more with PanEDM, the first experiment exploiting the ILL's new UCN source SuperSUN. SuperSUN is expected to provide a high density of UCN with energies below 80 neV, implying extended statistical reach with respect to existing sources, for experiments that rely on long storage or spin-precession times. Systematic errors in PanEDM are strongly suppressed by passive magnetic shielding, with magnetic field and gradient drifts at the single fT level. A holding-field homogeneity on the order of 10−4 is achieved in low residual fields, via a high static damping factor and built-in coil system. No comagnetometer is needed for the first order-of-magnitude improvement in dn, thanks to high magnetic stability and an assortment of sensors outside the UCN storage volumes. PanEDM will be commissioned and upgraded in parallel with SuperSUN, to take full advantage of the source's output in each phase. Commissioning is ongoing in 2019, and a new limit in the mid 10−27e cm range should be possible with two full reactor cycles of data in the commissioned apparatus.

scholarly journals The search for the neutron electric dipole moment at the Paul Scherrer Institute

2011 ◽  
Vol 17 ◽  
pp. 159-167 ◽  
Author(s):  
C.A. Baker ◽  
G. Ban ◽  
K. Bodek ◽  
M. Burghoff ◽  
Z. Chowdhuri ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Paul Scherrer Institute ◽  
Neutron Electric Dipole Moment ◽  
Paul Scherrer

scholarly journals Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron

Science ◽  
2013 ◽  
Vol 343 (6168) ◽  
pp. 269-272 ◽  
Author(s):  
◽  
J. Baron ◽  
W. C. Campbell ◽  
D. DeMille ◽  
J. M. Doyle ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Order Of Magnitude
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