Speaker
Dr
John Fox
(Stanford Linear Accelerator Center)
Description
The RF systems in PEP-II use direct and comb loop feedback
techniques to minimize the cavity fundamental impedance driving low-mode
coupled bunch instabilities. The effectiveness of these techniques are
strongly dependent on the linearity and dynamic behavior of the klystron
amplifier in the feedback path.
This short talk will summarize the impedance control techniques in PEP-II,
and review measurements which highlight the impact of klystron saturation
on low mode instabilities. Technical options to linearize the klystron and
our specific implementation are described. Results from full power test
stand measurements and beam tests are presented.
Author
Dr
John Fox
(Stanford Linear Accelerator Center)
