magnetic shielding; ultracold neutron; electric dipole moment
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The search for electric dipole moments (EDM) of fundamental systems presents a very promising route for finding new physics beyond the Standard Model (SM) of particle physics. A permanent electric dipole moment violates parity and time reversal symmetries and, invoking the CPT theorem, also CP symmetry. New sources of CP violation are expected to be found in order to understand the observed large baryon asymmetry of our universe (BAU) and because most extensions of the SM allow for new CP violating phases. Various non-observations of finite EDM, of the neutron as well as of nuclei, e.g. with the Hg-199 atom, and the electron, e.g. via the YbF molecule, so far present the most stringent constraints on new physics models of CP violation involving particles of the first generation. Many efforts world wide are underway to search for EDM in various systems like atoms, molecules, muons, light nuclei and neutrons.In this proposal we ask for a substantial support of the ETH group in the neutron EDM (nEDM, d_n) search at PSI. The ETH group is playing an important role, both in the operation and analysis of the ongoing nEDM experiment and in the design and construction of the new n2EDM apparatus. In the past 18 months, we concentrated our activities first on contributing to the operation and improvement of operation of nEDM, with a leading role in DAQ software development and work on the active surrounding field compensation. We also contributed to the preparation of the setup area for n2EDM with passive shielding for higher frequency (e.g. RF) noise and lab studies of the n2EDM active surrounding field compensation system. On the present SNF grant 138211, our PhD student G. Wyszynski (GW) joined the team in November 2011, our Postdoc J. Krempel (JK) joined in February 2012 coming from the PSI nEDM team and bringing with him very important specific know-how on measurement techniques, data acquisition and analysis. He is, in the meantime, playing a key role in almost all DAQ aspects of the nEDM experiment. Here, we ask for the extension of the SNF grant and the positions of the doctoral student and the postdoc for 24 months which will be essential for the successful continuation of the work started. It covers the first run period of the nEDM experiment during 2013-14 and subsequent analysis of the data. We expect to within this running period exceed the sensitivity of the best nEDM search to date.In addition, we propose to grant a second PhD student position which would allow studying in more detail issues with the passive mu-metal magnetic shield for n2EDM to which we are contributing with very substantial financial means. Our initial grant application two years ago included the request for a doctoral student and a postdoc in connection with this topic. While this couldn't be granted at that time, it is important to enter the respective studies now in order not to delay the n2EDM setup. This SNF application is the second for the ETHZ group in this project which is planned as a long term activity of the group.