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Content Provider | IEEE Xplore Digital Library |
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Author | Fox, J. Mastorides, T. Teytelman, D. van Winkle, D. Zhou, Y. Gallo, A. |
Copyright Year | 2005 |
Description | Author affiliation: Stanford Linear Accelerator Center, Menlo Park, CA 94025, U.S.A jdfox@slac.stanford.edu (Fox, J.) |
Abstract | The direct and comb loop feedback around the RF cavities in PEP-II is critical in reducing longitudinal instabilities driven by the cavity impedance. The non-linear 1.2 MW klystron is in the signal path for these feedback loops. As a result, the effective small-signal gain of the klystron at 85% saturation reduces the impedance control by factors of 5 to 20 as compared to a linear power amplifier. A klystron linearizer circuit has been developed which operates in series with the power amplifier and acts to equalize the small and large signal gains through the combination. The technique must implement a 1 MHz linear control bandwidth over roughly 15 dB of RF signal level variation. The dynamics of this system is operating point dependent, and the channel must have dynamic gain compensation to keep the linearity compensation loop stable over changes in operating point. The design of this non-linear signal processing channel (incorporating RF and DSP techniques) and measured results from full-power klystron testing are presented. |
Starting Page | 2660 |
Ending Page | 2662 |
File Size | 211329 |
Page Count | 3 |
File Format | |
ISBN | 0780388593 |
DOI | 10.1109/PAC.2005.1591219 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2005-05-16 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Klystrons Radio frequency Feedback loop Impedance Power amplifiers Radiofrequency amplifiers Nonlinear dynamical systems Circuits Bandwidth Linearity |
Content Type | Text |
Resource Type | Article |
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