Plasma Physics Seminar |
Dr. Rami
A. Kishek IREAP, University of Maryland The University of Maryland Electron Ring (UMER): A Platform for Investigating Dissipation and Chaotic Mixing in Intense Beams * The interaction of a swarm of particles by means of long range forces underlies many problems in modern physics, from laboratory plasmas to galactic dynamics. Emerging particle accelerators require beam brightness and intensity surpassing traditional limits, bringing beams into the realm of nonneutral plasmas. Therefore the understanding of collective interactions is crucial for successful development of such applications as heavy ion inertial fusion, high energy colliders, intense light sources, spallation neutron sources, and free electron lasers. Furthermore, particle accelerators can be used as laboratories for testing physics of relevance to other, less accessible, systems such as galaxies. The University of Maryland Electron Ring (UMER), currently near completion, is designed to be a scaled model (3.6-m diameter) for exploring the dynamics of such intense beams. Using a 10 keV electron beam, other parameters are scaled to mimic those of much larger ion accelerators, except at much lower cost. An adjustable current in the 0.1-100 mA range provides a range of intensities unprecedented for a circular machine. Since UMER is primarily designed to serve as a research platform for beam physics, it is equipped with a vast array of diagnostics providing for effective comparison against computer codes. * This work is funded by US Dept. of Energy grant numbers DE-FG02-94ER40855 and DE-FG02-92ER54178. |