Abstract
A PNPI/ILL experiment to measure the neutron electric dipole moment (EDM) is currently being prepared at the facility PF2 for ultracold neutrons (UCN) at the Institut Laue-Langevin in Grenoble. To enable an improvement of sensitivity, one of PF2's beam positions has been equipped with new components for UCN transport, polarization and beam characterization, comprised of a superconducting solenoid-polarizer with magnetic field 4 T, a neutron guide system with diameter 136 mm prepared in replica technology, and a novel beam chopper for time-of-flight analysis. The whole EDM apparatus is set up on a non-magnetic platform. The total flux of polarized UCN with velocities less than 6.8 m/s along the guide axis is 1.5×10 5 n/s, corresponding to a flux density of 10 3 cm −2 s −1. The density of polarized UCN at the experimental position is about 5 cm −3, which shall lead to an EDM measurement with a counting statistical accuracy of 1.5×10 −26 ecm during 200 days of operation at PF2.
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