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Accelerator Seminars

Accelerator Seminar Committee:
  Chair: Carlos Hernandez-Garcia / Past Chair: Joe Grames

    Members:Gianluigi Ciovati, Vasiliy Morozov
Steve Benson and Kevin Jordan

 Accelerator Seminars will be scheduled weekly on Thursdays from 11:00 a.m. - 12:00 p.m.
If you would like to schedule a seminar, please contact Carlos Hernandez-Garcia for approval.



DATE: February 4, 2016

TITLE: Search for Permanent Electric Dipole Moments of Protons and Deuterons Using Storage Rings

SPEAKER: Frank Rathmann, for the JEDI Collaboration, Institut fur Kernphysik, Forchungszentrum

TIME: 10:00 a.m.

LOCATION: ARC, Room 231/233

ABSTRACT: The Standard Model (SM) of Particle Physics is not capable to account for the apparent matter-antimatter asymmetry of our Universe. Physics beyond the SM is required and is searched for (i) employing highest energies (e.g., at LHC), and (ii) striving for ultimate precision and sensitivity (e.g. in the search for electric dipole moments (EDMs)). Permanent EDMs of particles violate both time reversal (T) and parity (P) invariance, and are via the CPT-theorem also CP-violating. Finding and EDM would be a strong indication for physics beyond the SM, and pushing upper limits further provides crucial tests for any corresponding theoretical model, e.g. SUSY. Direct searches of proton and deuteron EDMs bear the potential to reach sensitivities beyond 10-29 e∙cm.

The talk will highlight recent achievements from experimental investigations at COSY toward the search for electric dipole moments of protons and deuterons in storage rings; it will emphasize the most spectacular possibilities in modern science: Finding a signal for new physics beyond the Standard Model through the detection of permanent electric dipole moments in a storage ring.


DATE: February 19, 2016

TITLE: RHIC Performance with Stochastic Cooling for Ions and Electron Lenses for Protons

SPEAKER: Wolfram Fischer, Brookhaven National Laboratory

TIME: 11:00 a.m.

LOCATION: ARC, Room 231/233

ABSTRACT: The Relativistic Heavy Ion Collider (RHIC) has two main operating modes with heavy ions and polarized protons respectively. In addition to a continuous increase in the bunch intensity in all modes, two major new systems were completed recently mitigating the main luminosity limit and leading to significant performance improvements. For heavy ion operation stochastic cooling mitigates the effects of intrabeam scattering, and for polarized proton operation electron lenses mitigate the beam-beam effect. We present the performance increases with these upgrades for heavy ions and polarized protons, as well as an overview of all operating modes past and planned. The largest performance upgrade under way is a bunched beam electron cooler to increase the luminosity of Au+Au operation at the lowest energies, with Au beam stored below the nominal injection energy.




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