David L. Rubin, Cornell University

Professor Ithaca, New York dlr10@cornell.edu Office: (607) 255-3765

Expert In

Beam diagnostic instrumentation Beam-beam interaction Circular colliders Collective effects Electric dipole moment of fundamental particles Electron cloud Lepton colliders Low emittance tuning Muon g-2 Non-linear dynamics of particle beams Particle beam optics Resonance phenomena RF superconductivity Transverse coupling in beams

Bio/Research

The phase space density (emittance) of bunches of ultra-relativistic electrons and positrons circulating in a storage ring (like the Cornell Electron/Positron Storage Ring, CESR) is determined by the equilibrium of excitations - due to stochastic emission of photons, intra-beam scattering, electron cloud effects, interactions with residual gas and ions, and wake fields – and damping by synchrotron radiation. At the Wilson Laboratory we accelerate electrons and create positrons in our linear accelerator, boost their energy to anywhere from 1.5 to 5.3 GeV in the 768 m circumference synchrotron and then transfer them (positrons clockwise and electrons counterclockwise) to the storage ring CESR, where they circulate for many hours. The storage ring is instrumented with detectors to measure beam position, beam size, and bunch length, as well as the cloud of electrons that evolves around a positron beam and the ions trapped by an electron beam. CESR is the laboratory for the study of the physics that limits the particle density. We continue to develop instrumentation with better precision and higher bandwidth for monitoring beam properties. Our goal is to achieve the quantum limited emittance and to explore the particle dynamics in the ultra-low emittance regime.

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