Georg Hoffstaetter, Cornell University

Professor Ithaca, New York gh77@cornell.edu Office: (607) 255-5197

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The Physics of Beams is the study of accelerated beams as a special state of matter. It has many applications in particle accelerators, spectrometers, electron microscopes, and lithographic devices. These instruments have become so complex that an empirical approach to properties of the particle beams is by no means sufficient and a detailed theoretical understanding is necessary. Historically it has proved fruitful that studies in beam physics have been performed in the context of projects that developed or built one of these instruments, and I have worked on several such projects, on the 4 mile circular accelerator HERA in Hamburg, where I contributed to the understanding of the non-linear dynamics and long term stability of the stored particles, of polarization dynamics, and of space charge forces acting from one particle beam to another. I am coordinating the accelerator science work for an Energy Recovery Linear Accelerator (ERL) at Cornell where my interests concern nonlinear beam dynamics, multi bunch instabilities, space charge within a tightly focused beam, the creation of synchrotron light, and the back-reaction of coherently emitted light on the beam. X-ray beams from charged particle accelerators have become an essential tool in today's investigation of all types of materials, from airplane wings to cell membranes and from pollutants in leaves to matter under earth-core pressures. And ERLs can be used as novel x-ray light source with beams significantly better than those of the world's most advanced facilities. ERLs are also planned for high-energy Electron Ion Colliders, for electron coolers of ion beams, and for nuclear physics experiments,. At Cornell, we plan to build a test ERL to prototype components and to analyze effects important for these large-scale projects.

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