First commissioning results of the waveguide RF Wien filter

  • Jamal SlimEmail author
  • for the JEDI Collaboration
Part of the following topical collections:
  1. Proceedings of the 7th Symposium on Symmetries in Subatomic Physics (SSP 2018), Aachen, Germany, 10-15 June 2018


The JEDI (Jülich Electric Dipole Investigations) ( Collaboration aims to carry out a long term project for the measurement of the permanent electric dipole moments of charged particles in a storage ring. As a proof-of-concept, the COoler SYnchrotron (COSY) was equipped with a waveguide RF Wien filter designed to operate at some harmonics of the spin precession frequency ranging from 0.1 to 2 MHz. This device maintains the corresponding ratio between the RF electric and magnetic fields necessary not to induce any beam excitation and most importantly acts as a spin flipper. In the course of 2017, the waveguide RF Wien has been successfully commissioned and tested. The ability of the device to produce a Lorentz Force compensation and to rotate the particles’ polarization vector has been verified. Driven vertical spin oscillations and vertical polarization build-up has been observed. This short article briefly discusses the results of the Lorentz force measurements at 871 kHz.


Waveguide RF Wien filter Electric dipole moment Lorentz force 



This work has been performed in the framework of the JEDI collaboration and is supported by an ERC Advanced-Grant of the European Union (Proposal No. 694340).


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Authors and Affiliations

  1. 1.III. Physikalisches Institute BRheinisch-Westfälische Technische Hochschule AachenAachenGermany

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