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Applied Science and Convergence Technology 1994; 3(3): 257-263

Published online September 1, 1994

Copyright © The Korean Vacuum Society.

The Instability Due to the Parasitic Modes in the Electron Storage Ring

Soon-Kwon Nam

Abstract

The wake potential, total loss and the impedances for the sum of parasitic modes in our designed cavity are computed. We see that the analytical ca1calculations are agree well with a numerical ca1calculations by the computer codes URMEL and TBCI. The instability phenomena for our cavity is also calculated based on the Fokker-Planck equation for synchrotron motion. We see that our calculations satisfy the stability criterion for the higher order modes. It was found that strong Robinson instability does not occur in our case. We find that the threshold with the potential well distortion(PWD) is 1.65×10^(10) by the tracking calculation using the long range wakefield for the longitudinal single bunch instabilities. We have also calculated the coupled bunch instability growth rates for the 15 parasitic modes of the designed RF cavity.

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