SRF2011 - List of Authors (Ko, K.)

Paper	Title	Page
MOPO061	Effects of Elliptically Deformed Cell Shape in the Cornell ERL Cavity	244
	L. Xiao, K. Ko, K.H. Lee, C.-K. Ng SLAC, Menlo Park, California, USA M. Liepe, N.R.A. Valles CLASSE, Ithaca, New York, USA
	The Cornell ERL cavity is optimized to minimize the dipole mode BBU parameters to achieve the required high beam current (100mA). Deformations due to errors in fabrication and tuning of the accelerating mode can result in a cavity shape different from the ideal. In elliptically deformed cells, this can cause dipole mode frequency spread and splitting of the mode polarizations leading to an x-y mode coupling. To investigate these effects, we use a mesh distortion technique to generate an elliptically deformed cell cavity model as a base for studying random imperfections. Simulation results from the eigensolver Omega3P of one hundred randomly elliptically deformed cell cavities covering the first three dipole bands will be presented. The results will be used as input to the beam tracking code BMAD to calculate the impact of such imperfections on the dipole mode BBU parameters.

Paper

Title

Page

Effects of Elliptically Deformed Cell Shape in the Cornell ERL Cavity

244

L. Xiao, K. Ko, K.H. Lee, C.-K. Ng
SLAC, Menlo Park, California, USA
M. Liepe, N.R.A. Valles
CLASSE, Ithaca, New York, USA

The Cornell ERL cavity is optimized to minimize the dipole mode BBU parameters to achieve the required high beam current (100mA). Deformations due to errors in fabrication and tuning of the accelerating mode can result in a cavity shape different from the ideal. In elliptically deformed cells, this can cause dipole mode frequency spread and splitting of the mode polarizations leading to an x-y mode coupling. To investigate these effects, we use a mesh distortion technique to generate an elliptically deformed cell cavity model as a base for studying random imperfections. Simulation results from the eigensolver Omega3P of one hundred randomly elliptically deformed cell cavities covering the first three dipole bands will be presented. The results will be used as input to the beam tracking code BMAD to calculate the impact of such imperfections on the dipole mode BBU parameters.