1. Search for Electric Dipole Moments: The JEDI-Project at Jülich
Hans Ströher|Forschungszentrum Jülich

2. Motivation: Preponderance of Matter
The matter-antimatter asymmetry of the universe:
What we should see: What we actually see:
equal amount of predominantly matter
matter and antimatter almost no antimatter
Ratio
1010 :1
Matter
Anti-
Matter
This is one of the big unsolved problems in physics !

3. The 3 discrete symmetries of Nature:
Symmetries (and Symmetry Violation)
The 3 discrete symmetries of Nature: + − C P T
JEDI
(Jülich Electric Dipole moment Investigations)

4. Charged particle (p, d) EDMs – principle of experiment:
JEDI: Charged-Particle EDM Search
Charged particle (p, d) EDMs – principle of experiment:
Inject polarized particles into a storage ring:
Apply radial electric field E:
Non-zero EDM  spin rotation out of the plane

5. Charged particle (p, d) EDMs – principal challenges:
JEDI: Charged-Particle EDM Search
Charged particle (p, d) EDMs – principal challenges:
EDMs are very (!) small:
 systematics, fake EDM effects +
<10 µm -
Neutron
1 fm
1022 fm

6. JEDI: Charged-Particle EDM Search
Staged approach:
Proof-of-principle (precursor experiment) at COSY
 Not highest sensitivity (because conventional SR)
RF-Wien Filter

7. JEDI: Charged-Particle EDM Search
Staged approach:
Dedicated precision storage ring: CW/CCW beams
Proton: pure electrostatic deflection possible (G > 0)
Deuteron: combined E/B-fields
 Goal: statistical sensitivity of e cm

8. Research and Development at COSY:
JEDI: Charged-Particle EDM Search
Research and Development at COSY:
New polarimeter (SMART|EDM_Lab + Georgian IKP-group)
More ideas, e.g., for the interaction target, the photo-sensor,
etc.

9. Technical Design Report (w/ CERN):
JEDI: Charged-Particle EDM Search
Technical Design Report (w/ CERN):
Physics-beyond-colliders initiative
due end of 2018 …
Design parameters (p):
Momentum: GeV/c
Energy: GeV
Circumference: ~ 500 m
Bending sections: ~ 10 m
Straight sections: ~ 21 m
E-Field: MV/m

10. JEDI: Charged-Particle EDM Search
Summary:
Physics – outstanding science case
Technology – outstanding challenges