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@inproceedings{ego:fls2023-tu3d4, author = {H. Ego and T. Asaka and T. Inagaki and N. Nishimori and T. Ohshima and H. Tanaka and T. Tomai and H. Yamaguchi}, % author = {H. Ego and T. Asaka and T. Inagaki and N. Nishimori and T. Ohshima and H. Tanaka and others}, % author = {H. Ego and others}, title = {{Compact HOM-damped RF Cavity for a Next Generation Light Source}}, % booktitle = {Proc. FLS'23}, booktitle = {Proc. 67th ICFA Adv. Beam Dyn. Workshop Future Light Sources (FLS'23)}, eventdate = {2023-08-27/2023-09-01}, pages = {74--76}, paper = {TU3D4}, language = {english}, keywords = {cavity, HOM, damping, impedance, operation}, venue = {Luzern, Switzerland}, series = {ICFA Advanced Beam Dynamics Workshop}, number = {67}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {01}, year = {2024}, issn = {2673-7035}, isbn = {978-3-95450-224-0}, doi = {10.18429/JACoW-FLS2023-TU3D4}, url = {http://jacow.org/fls2023/papers/tu3d4.pdf}, abstract = {{A beam-accelerating RF cavity with a new HOM-damping structure was designed in order to suppress coupled-bunch instabilities in a next generation light source with an ultra-low emittance and supplying X-rays approaching their diffraction limits. The TM020 mode at 509 MHz is selected as a beam-accelerating mode because it has a high Q-value of 60,000 and a shunt impedance sufficient for beam acceleration and brings a compact HOM-damping structure to the cavity differently from massive types of cavities with waveguides or pipes extracting HOM power. Two shallow slots are cut on the cavity inner-wall and materials absorbing RF waves are directly fitted into them. They work as HOM dampers without affecting the RF properties of the beam-accelerating mode. A prototype cavity of OFHC copper was fabricated to demonstrate the HOM-damping and generating an accelerating voltage of 900 kV in the cavity. Since the cavity was successful in operation up to 135 kW, the feasibility of both the high-power operation and the damping structure was proved. Four actual cavities were produced and installed to the new 3-GeV synchrotron radiation facility, NanoTerasu in Japan.}}, }