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28 March 2024
 
  » arxiv » 1911.9161

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The PanEDM Neutron Electric Dipole Moment Experiment at the ILL
David Wurm ; Douglas H. Beck ; Tim Chupp ; Skyler Degenkolb ; Katharina Fierlinger ; Peter Fierlinger ; Hanno Filter ; Sergey Ivanov ; Christopher Klau ; Michael Kreuz ; Eddy Lelièvre-Berna ; Tobias Lins ; Joachim Meichelböck ; Thomas Neulinger ; Robert Paddock ; Florian Röhrer ; Martin Rosner ; Anatolii P. Serebrov ; Jaideep Taggart Singh ; Rainer Stoepler ; Stefan Stuiber ; Michael Sturm ; Bernd Taubenheim ; Xavier Tonon ; Mark Tucker ; Maurits van der Grinten ; Oliver Zimmer ;
Date 20 Nov 2019
AbstractThe neutron’s permanent electric dipole moment $d_n$ is constrained to below $3 imes10^{-26} e~ ext{cm}$ (90% C.L.) [ arXiv:hep-ex/0602020, arXiv:1509.04411 ], 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 $d_n$, 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 $10^{-27} e~ ext{cm}$ range should be possible with two full reactor cycles of data in the commissioned apparatus.
Source arXiv, 1911.9161
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