Permanent EDMs (Electric Dipole Moments) of fundamental particles violate both time invariance and parity and, assuming the CPT theorem, this implies CP violation. This feature inserts EDMs among the highest sensitive probes of CP violation. The standard model predicts non-vanishing EDMs; however, their magnitudes are expected to be very small. The discovery of a non-zero EDM would be a direct signal for “new physics” beyond the Standard Model. Until now, EDM searches have been limited to trapped neutral system. Searches for EDMs of charged fundamental particles have hitherto been impossible because of the absence of the required new class of primarily electrostatic storage rings.
The search of the electron EDM (eEDM) in a storage ring has to be inserted into this general physics framework. On the experimental side, one of the appealing features of eEDM searches is represented by the small size of the required machine. This is the result of the combination of the “magic-energy” required to provide the frozen-spin condition for the electrons (at a beam energy of ~14.5 MeV), and the use of state-of-the-art electric deflector elements. Its compactness makes such a machine an ideal place for the development of technological innovations and exploring the systematics of a new generation electrostatic storage ring. From this viewpoint, a large synergy can be envisaged between this effort and the searches for proton and deuteron EDMs that require larger machines.
Besides addressing the physics case of the search for EDMs, the workshop is aimed to motivate discussions on key technical issues like polarimetry, electrostatic-lattice design, beam-diagnostics, electrostatic-deflector elements, magnetic shielding, and spin-tracking. The dates of September, 10-11 have been suggested in proximity to the “Polarized Sources, Targets and Polarimetry” Workshop, taking place in Bochum, Germany on September 14-18. The intention is to allow the interested part of the community to coordinate their presence at both events.

Topics of the workshop will include:
  • Controlling systematics in EDM storage ring experiments
  • Electrostatic rings
  • Is an electrostatic electron ring a viable option?
  • Setups for beam and spin dynamics studies
  • Beam polarimetry
  • Technology: high voltage, magnetic shielding, XHV, ...
  • Beam diagnostics
  • Requirements for an injector
Institut für Kernphysik
Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz

Scientific organizing committee:
Kurt Aulenbacher (Mainz)
Paolo Lenisa (Ferrara)
Frank  Rathmann (Jülich)

Organizing committee
Kurt Aulenbacher
Fabian Nillius
Tanja Schwerdt