ICNPF 2013, Crete, Aug. 28 – Sept. 5, 2013 JEDI - The Jülich Electric Dipole Moment Investigations in Storage Rings 31. 08. 2013 | H. Ströher

The European Strategy for Particle Physics, Update 2013 EDM – A Top Priority Recommendations EDM The European Strategy for Particle Physics, Update 2013

SNOWMASS Meeting, August 2013 (US HEP Community) EDM – A Top Priority SNOWMASS Meeting, August 2013 (US HEP Community)

EDMs can contribute to many of the „Big Questions“ EDM – A Top Priority EDMs can contribute to many of the „Big Questions“

EDM – Estimate of the Scale Size of the nucleon: D = 1 fm = 10-13 cm d = 10-13 e cm Nature violates parity  price to pay: ~ 10-7 Nature violates CP  price to pay: ~ 10-3 EDM < 10-23 e cm Electric dipole moments are very small  precision experiments

EDM – Current Upper Limits natural scale EDM upper limits (e cm) New: Charged Hadrons e m t n p L d in atom in atom EDMs will have a huge impact on „Physics beyond the SM“

EDM – Ongoing/planned Searches new P. Harris, K. Kirch … A huge worldwide effort

EDM – Ongoing/planned Searches nEDM: aim at sensitivity of a few times 10-28 e cm

EDM – Points to Remember EDM (searches) for charged-particles: use of polarized beams in storage ring(s) EDM (searches) EDM (searches) have an exceptional physics case are very hard to measure (in fact, none observed so far!) „JEDI“ (Jülich Electric Dipole Moment Investigations) w/i JARA|Fame

AMS (not discussed further) and EDM EDM – Larger Scope The Fate of Anti- matter Search for it ! It´s gone – why ? AMS EDM AMS (not discussed further) and EDM

EDM – Measurement Principle (I) B E B E f+ = 2µB` + 2dE` µ d f- = 2µB` - 2dE` Precession frequency (difference)  example: neutron

EDM – Measurement Principle (II) Spin Momentum „Freeze“ horizontal spin of polarized charged particle beam in storage ring along the momentum, … Momentum and polarization vector

EDM – Measurement Principle (II) Spin Momentum „Freeze“ horizontal spin of polarized charged particle beam in storage ring along the momentum, … … after one turn …

EDM – Measurement Principle (II) Spin Momentum „Freeze“ horizontal spin of polarized charged particle beam in storage ring along the momentum, … Polarization vector points in different direction („spin tune“)

EDM – Measurement Principle (II) „Freeze“ horizontal spin of polarized charged particle beam in storage ring along the momentum, … „Frozen spin“ (particle momentum and E- and B-fields)

EDM – Measurement Principle (II) Application of a radial electric field (E): Torque: t ~ d x E (if EDM is non-zero) Goal: 10-29 e cm – a challenge ! Observable: development of vertical polarization

EDM – Charged Particles in SRs   An incomplete list of challenges

EDM – Charged Particles in SRs COSY (Cooler Synchrotron) at FZ-Jülich 184 m JEDI („Jülich Electric Dipole Moment Investigations“)

EDM – Charged Particles in SRs COSY (Cooler Synchrotron) at FZ-Jülich Polarized proton, deuteron beams Momentum range 0.3 to 3.7 GeV/c Electron and stochastic cooling Internal targets and detectors Spin manipulators: RF solenoid, RF dipole, Siberian Snake Polarimeter  Best possible starting point for srEDM JEDI („Jülich Electric Dipole Moment Investigations“)

EDM – Charged Particles in SRs COSY (Cooler Synchrotron) at FZ-Jülich EDM Sensitivity 10-29 e cm Dedicated SR First direct measurements for p, d 10-24 e cm Precursor expt. w/ COSY R&D, test measurements at COSY Time Now JEDI („Jülich Electric Dipole Moment Investigations“)

EDM – Charged Particles in SRs Polarimetry Tests with an existing polarimeter (EDDA) at COSY: Beam onto a C-target; spin-dependent scattering Proof of principle - required accuracy achieved Results (NIM A 664 (2012) 49); systematic errors < 1ppm Stage 1: Ongoing R&D at COSY

EDM – Charged Particles in SRs Spin Tune Measurements ~ 1.2 x 107 ~ 7 x 107 Deviation ~ 25 ppb Stage 1: Ongoing R&D at COSY

EDM – Charged Particles in SRs Spin Coherence Time (SCT) Optimization Tests with an existing polarimeter (EDDA) at COSY: Longitudinal spin decoherence (due to beam oscillations) Decoherence compensated by tuning sextupole magnets Result: SCT of ~ 200 s have already been achieved Stage 1: Ongoing R&D at COSY

EDM – Charged Particles in SRs Electrostatic Deflectors Replace D2-magnet by electrostatic deflector L~2.5 m Tests with existing equipment from Tevatron (Fermi Lab, USA): Routine operation at 1 spark/year at 6 MV/m at Tevatron Transfer to Jülich, reproduce and improve (w/ ZEA, RWTH) Installation into COSY (option): B-E-B chicane Stage 1: Ongoing R&D at COSY

EDM – Charged Particles in SRs Precursor Experiment at COSY Proof-of-principle with existing (conventional) storage ring COSY: Modifications of COSY (ANKE, PAX, WASA, … out) Power supply stabilization; beam position monitors … „Magic“ RF Wien-filter (E-B field): Stage 2: pEDM and/or dEDM  10-24 e cm

EDM – Charged Particles in SRs Precision EDM Storage Ring Technical design criteria: Counter-rotating (CW, CCW) beams pEDM: all-electric ring possible: (p, d, 3He, …)EDM: combined electric and magnetic fields Stage 3: Dedicated storage ring (with COSY as injector)

EDM Project within JARA|FAME („JEDI“) EDM – Summary EDM (searches) have an exceptional physics case are very hard to measure for charged-particles: use of polarized beams in storage ring(s): Jülich is the „best place on earth“ EDM Project within JARA|FAME („JEDI“)