EUCARD workshop "Search for the electron EDM in an electrostatic storage ring"

Europe/Berlin
Institut für Kernphysik (Mainz)

Institut für Kernphysik

Mainz

Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
Kurt Aulenbacher (Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)
Description
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
Participants
  • Alexander Silenko
  • Alfredo U Luccio
  • Andrea Pesce
  • Andreas Lehrach
  • Carlo Guaraldo
  • Edward Stephenson
  • Eleni Petrakou
  • Erhard Steffens
  • Fabian Nillius
  • Fabian Trinkel
  • Frank Rathmann
  • Gudrid Moortgat-Pick
  • Helmut Soltner
  • Joerg Pretz
  • Kirill Grigoryev
  • Kurt Aulenbacher
  • Martin Gaisser
  • Mei Bai
  • Paolo Lenisa
  • Richard Talman
  • Selcuk Haciomeroglu
  • Seongtae Park
  • Soohyung Lee
  • Tanja Schwerdt
  • William Marciano
  • William Morse
  • Wolfgang Hillert
  • Yannis Semertzidis
  • Thursday, 10 September
    • 09:00 10:00
      Registration Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 10:00 10:15
      Coffee 15m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 10:15 10:20
      Opening Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 10:20 11:05
      The electron edm as a Sensitive Probe of Higgs CP Violation 45m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      tba
      Speaker: Prof. William MARCIANO (Brookhaven National Laboratory)
      Slides
    • 11:05 11:15
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 11:15 12:00
      What can we learn from an electron storage ring EDM 45m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      I will present the motivations for building an electron all-electric storage ring. One can test a number of systems, e.g., the SQUID-based beam position monitors, button-based beam position monitors, beam dynamics, fringe field issues, beam-beam effects, etc. Several ideas of measuring the electron polarization are already presented which, if successful, will allow testing issues like spin coherence time, fringe-field effect on polarization, etc
      Speaker: Prof. Yannis Semertzidis (Institute for Basic Science)
      Slides
    • 12:00 12:15
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 12:15 13:15
      Lunch 1h Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 13:15 14:00
      Potential for a search for a cartan spacetime torsion and a CPT violation in gravity in an electrostatic electron storage ring 45m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      Electrostatic (all-electric) storage rings are very appropriate for a search for EDMs of particles and nuclei with g>2. We propose other applications of such rings. Strong reduction of g-2 spin rotations in these rings allows one to use them for a measurement of the spin-rotation coupling in the Earth’s rotating frame and significantly improves conditions of such a measurement as compared with earlier propositions [1]. The angular frequency of the spin rotation about the vertical axis Ω affected by the frame rotation and by the Coriolis force depends on the geographical latitude. If a Cartan spacetime torsion is nonzero, it changes the spin-rotation coupling. A long spin coherence time makes it possible to measure Ω with a high precision and to establish a new bound on the torsion. For example, the precision of 7X10^{-9} rad/s improves the current bound by two orders of magnitude. For this purpose, the g-2 spin rotation should be compared for clockwise and counterclockwise beams. The use of the electrostatic electron storage ring presents also a possibility to perform the first experiment on a check of the CPT conservation in gravity. For this purpose, g-2 experiments with positrons with the same momentum should be also carried out. A CPT violation leads to a difference of g-2 frequencies for electrons and positrons. The work is supported by the BRFFR and by the Heisenberg-Landau program. [1] A.J. Silenko and O.V. Teryaev, Phys. Rev. D 76, 061101(R) (2007).
      Speaker: Prof. Alexander Silenko (Research Institute for Nuclear Problems of Belarusian State University and Joint Institute for Nuclear Research)
      Slides
    • 14:00 14:07
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 14:07 14:52
      design a symplectic tracking of an electrostatic storage ring for EDM search 45m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      we designed using MADX an electrostatic ring for EDM, and performed symplectic tracking of orbits and spin of the same using a leapfrog algorithm
      Speaker: Prof. Alfredo U Luccio (Brookhaven National Laboratory)
      Slides
    • 14:52 15:00
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 15:00 15:30
      Coffee 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 15:30 16:00
      Magnetic Shielding Issues in the Field of EDM Research 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      The effect of the ubiquitous static and dynamic magnetic fields may easily mask the signals due to the electric dipole moment in EDM investigations, because of the dominant magnetic dipole moment of the particles. For the reduction of the impact of magnetic fields on the experiment it has to be shielded by a solid magnetic enclosure, a surrounding actively-controlled coil array, or a combination of both. The talk will highlight several aspects of magnetic shielding and its effectiveness for EDM experiments.
      Speaker: Dr Helmut Soltner (Forschungszentrum Jülich GmbH)
      Slides
    • 16:00 16:10
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 16:10 16:40
      Development of a Rogowski Coil as a new Beam Position Monitor 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      So far there have been no direct Electric Dipole Moment (EDM) measurements for charged hadrons. Therefore, a direct measurement of non-zero EDMs would be a first indication for physics beyond the Standard Model. A first step of the JEDI collaboration towards a precursor experiment for an EDM measurement is the development of new high-precision Beam Position Monitors (BPMs) for hadrons and testing them in the laboratory and at the storage ring COSY (COoler SYnchrotron) in Jülich. The first results from a measurement at COSY with a Rogowski Coil as a horizontal BPM will be presented.
      Speaker: Mr Fabian Trinkel (Germany)
      Slides
    • 16:40 16:50
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 16:50 17:20
      Electrostatic deflector development for JEDI 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      The direct measurement of the proton or deuteron electric dipole moment has never been performed before. These experiments can be done at storage rings. As a starting point for a first measurement, the pure magnetic storage ring COSY at Forschungszentrum Jülich can be used. A deticated stroage ring will require electrostatic elements. For testing the electrode material, shape, surface treatment and high voltage tests, a new laboratory was set up at Aachen University. The Aachen laboratory, experimental setup and first tests will be presented.
      Speaker: Dr Kirill Grigoryev (RWTH Aachen)
      Slides
    • 17:20 17:30
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 17:30 19:00
      MAMI tour Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 19:30 22:30
      Dinner downtown

      downtown

      Mainz

  • Friday, 11 September
    • 08:30 09:00
      Coffe 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 09:00 09:30
      Storage Ring EDM Measurement Using Resonant Polarimetry 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      It is proposed to use a resonant cavity sensitive to the magnetization of a polarized beam for polarimetry in storage ring EDM measurements. "Rolling" the beam polarization of a nearly frozen spin beam around a radial axis has two essential features. It preserves the EDM effect (as a shift in roll rate) and (the reason for inducing the roll) it shifts the frequency of the magnetization signal away from the nearest revolution frequency harmonic. This is essential for distinguishing the magnetization signal from a potentially much larger direct Coulomb-induced response of the resonator. Resonant polarimetry is passive and non-destructive and has ideal analysing power. Being coherent, a resonant polarimeter can be used to stabilize one degree of freedom of the beam polarization. The roll is imposed on the beam polarization by a reversible Wien filter. Assuming the reversal is perfect, the backward/forward roll rate difference provides a frequency domain measure of the pa rticle EDM
      Speaker: Prof. Richard Talman (Cornell University)
      Slides
    • 09:30 09:40
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 09:40 10:10
      Beam and Spin Dynamics for Charged Particle EDM Searches in Storage Rings 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      Permanent EDMs (electric dipole moment) of fundamental particles violate both time invariance T and parity P. Assuming the CPT theorem this implies CP violation. The Standard Model predicts non-vanishing EDMs, their magnitudes, however, are expected to be unobservably small with current techniques. Hence, the discovery of a non-zero EDM would be a signal for "new physics". As a first step towards EDM searches of charged particles in storage rings, R&D work at the Cooler Synchrotron COSY is pursued. Subsequently, a first direct EDM measurement of a charged particle will be performed at COSY, and, on a longer time scale, the design and construction of a dedicated storage ring will be carried out. Full spin-tracking simulations of the entire experiment are absolutely crucial to explore the feasibility of the planned storage ring EDM experiments and to investigate systematic limitations. Existing spin tracking programs like COSY Infinity have to be extended to properly simulate spin motion in presence of an EDM. In addition, benchmarking experiments are performed at the Cooler Synchrotron COSY to check and to further improve the simulation tools.
      Speaker: Prof. Andreas Lehrach (IKP, FZ Jülich)
      Slides
    • 10:10 10:20
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 10:20 10:50
      The MESA project and its electron polarimeters 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      tba
      Speaker: Dr Kurt Aulenbacher (Institut für Kernphysik, Universität Mainz)
      Slides
    • 10:50 11:00
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 11:00 11:30
      Coffee 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 11:30 12:00
      electron spin measurements by undulator radiation 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      Synchrotron radiation by particles with spin show a contribution due to the spin. In particular from the line spectrum of radiation produced by an udulator the components of the spin can be measured. This mechanism can be effectively used in electron EDM measurements.
      Speaker: Prof. Alfredo U Luccio (Brookhaven National Laboratory)
      Slides
    • 12:00 12:15
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 12:15 12:45
      Optimal Momentum for an eEDM Experiment 30m Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
      I will discuss the optimal momentum for an electron EDM experiment. The so-called magic momentum is when we freeze the spin precession due to the magnetic moment with only an electric field. The electron magic momentum is 15 MeV/c. At other momenta, we need both an electric and a magnetic field to freeze the spin precession due to the magnetic moment. The motional electric field is E + vxB. Below the magic momentum, these two terms have the same sign, while above they have opposite signs. The spin precession due to an edm (d) is d x(E + vxB). Thus for momenta lower than the magic momentum, we get greater spin precession due to the edm than at the magic momentum. I will discuss this and lattice issues, systematics, etc. vs. the electron momentum.
      Speaker: William Morse (BNL)
      Slides
    • 12:45 13:00
      Questions Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 13:00 13:15
      Group picture Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
    • 13:15 15:15
      Lunch & Closeout 2h Institut für Kernphysik

      Institut für Kernphysik

      Mainz

      Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D 55128 Mainz
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