ECE Graduate Seminar
<p> The ECE Department cordially invites you to attend the following seminar:</p> <p> Plasma Processing of SRF Accelerator Cavities</p> <p> By</p> <p> Dr. Svetozar Popovic</p> <p> Department of Physics, Center for Accelerator Science</p> <p> Old Dominion University</p> <p> Host: Dr. Filip Cuckov</p> <p> Friday, March 22, 2013</p> <p> 3:00 p.m. KH 224</p> <p> Motivation for this talk is to provide insight into the rich phenomenology of plasma processing of the accelerator cavity walls, which has received a renewed attention in the context of the development of compact light sources that require a new generation of compact superconducting radio-frequency (SRF) accelerators. These accelerators may incorporate SRF cavities of complex shapes in order to satisfy stricter requirements for beam dynamics. The study is focused on the behavior of contaminated superconductor surface and the plasma processing methods, still in development, of removal of organic dielectric, and conductor layers. It will also address the consequences of plasma processing on secondary electron emission (SEE) and the multipactor effect, which is one of the major adverse factors in SRF accelerator performance. In situ cleaning of used SRF cavities and the approach to measurements of SEE from thin superconductive films are described as practical tasks. Efforts in the automation of the optical diagnostic techniques will be presented. Fundamental problems of the low-energy electron impact and zero-energy limit for SEE, related to the multipactor discharge will be discussed. The use of plasma processes in semiconductor industry and nanotechnology research will be compared to the processing of accelerator cavities.</p> <p> Bio:</p> <p> Svetozar Popovic has an extensive research experience in applied plasma and radiation physics. He graduated in 1977 from University of Belgrade and has held a number of senior research positions in the Institute of Physics, and in a number of American research institutions. His current research interests are in the areas of plasma aerodynamics, plasma assisted combustion, plasma processing of accelerator cavities, multipactor discharges and detection of radiation. He has published his work in more than 80 peer-reviewed journals and holds 2 US patents. He acts as a reviewer for Physical Review journals, Journal of Applied Physics, Applied Physics Letters, and IEEE Transactions on Plasma Science. As a member of the Center for Accelerator Science, he is currently PI or Co-PI on several DOE projects (total 1 MU$), and was formerly PI or co-PI on several NASA projects (total in excess of 1.5 MU$).</p> <p> </p> <p> </p>
Posted By: Linda Marshall
Date: Wed Mar 20 11:20:45 EDT 2013