Speaker
Alexis Gamelin
(Synchrotron soleil)
Description
When computing the resistive wall impedance, one must account for variations in beam pipe aperture, conductivity, and beta function. This can be done by either summing individual contributions or using an "effective radius" in an analytic formula. However, the standard "effective radius" formula has limitations: it ignores cross-plane influences and lacks formulas for quadrupolar or monopolar wakes.
This paper introduces an improved "effective radius" definition using Yokoya factors, addressing these limitations. This updated formula was used to develop SOLEIL’s new impedance model, significantly improving the agreement between simulated and measured instability thresholds.
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Author
Alexis Gamelin
(Synchrotron soleil)
Co-authors
Vadim Gubaidulin
(Synchrotron soleil)
Sudhanshu Thakur
(Deutsches Elektronen-Synchrotron DESY)