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@InProceedings{emery:napac2019-weplm04,
author = {L. Emery and P.S. Kallakuri and D. Teytelman and U. Wienands},
title = {{Precision Cavity Higher-Order Mode Tuning Scheme for Stabilizing the Stored Beam in the Advanced Photon Source Upgrade}},
booktitle = {Proc. NAPAC'19},
pages = {670--672},
paper = {WEPLM04},
language = {english},
keywords = {cavity, HOM, damping, impedance, resonance},
venue = {Lansing, MI, USA},
series = {North American Particle Accelerator Conference},
number = {4},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2019},
issn = {2673-7000},
isbn = {978-3-95450-223-3},
doi = {10.18429/JACoW-NAPAC2019-WEPLM04},
url = {http://jacow.org/napac2019/papers/weplm04.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM04},
abstract = {The Advanced Photon Source Upgrade will suffer longitudinal multi-bunch instability because of the presence of several monopole higher-order mode (HOMs) of the 12 352-MHz rf cavities. Even with a feedback system, it would be good to mitigate any driving terms with conventional means such as tuning HOM frequencies with temperature. However the latter is problematic because there will be 90 or so HOMs that are potentially harmful. A scheme is developed, utilizing the measured spectrum of HOMs, to find the best temperature setting for each cavity. We present measurements of 30 or so HOMs, and a thermal model of HOM frequencies using cavity wall power and cooling water temperature as inputs to maintain the optimum tuning condition with sufficient accuracy. The newly acquired Dimtel iGp12 processor box is central to the HOM frequency measurements.},
}