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@inproceedings{fukuda:cyclotrons2022-weai02, author = {M. Fukuda and T.H. Chong and T. Hara and K. Hatanaka and S. Imajo and H. Kanda and M. Kittaka and S. Matsui and S. Morinobu and Y. Morita and K. Nagayama and M. Nakao and T. Saito and T. Shima and K. Takeda and H. Tamura and D. Tomono and Y. Yasuda and T. Yorita and H. Yoshida and H. Zhao}, % author = {M. Fukuda and T.H. Chong and T. Hara and K. Hatanaka and S. Imajo and H. Kanda and others}, % author = {M. Fukuda and others}, title = {{Upgrade of the RCNP AVF Cyclotron}}, % booktitle = {Proc. CYCLOTRONS'22}, booktitle = {Proc. 23rd Int. Conf. Cyclotrons Appl. (CYCLOTRONS'22)}, pages = {143--147}, paper = {WEAI02}, language = {english}, keywords = {cyclotron, ion-source, proton, experiment, extraction}, venue = {Beijing, China}, series = {International Conference on Cyclotrons and their Applications}, number = {23}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2023}, issn = {2673-5482}, isbn = {978-3-95450-212-7}, doi = {10.18429/JACoW-CYCLOTRONS2022-WEAI02}, url = {https://jacow.org/cyclotrons2022/papers/weai02.pdf}, abstract = {{The upgrade program of the RCNP K140 AVF cyclotron was started in 2019 to provide not only an intense light ion beam for short-lived RI production but also a high-quality intense beam for precision experiments in nuclear physics. Most of equipment besides the main coil, pole and yoke of the cyclotron magnet was replaced by new one. Especially the RF, injection and extraction systems were fully modified to increase a beam current. A new coaxial-type resonator was designed to cover a frequency range from 16 to 36 MHz for acceleration of staple particles using acceleration harmonic mode of h=2 and h=6. The acceleration voltage of ion sources was increased from 15 kV to 50 kV to enhance the beam intensity and to reduce the beam emittance for injecting a high-quality intense ion beam into the cyclotron. The central region of the cyclotron was fully redesigned to improve beam transmission from the LEBT system. Beam commissioning was started from May 2022, and a 28 MeV 4He²⁺ beam was supplied to produce a short-lived RI of At-211 used for the targeted alpha-particle therapy. A 65 MeV proton beam was successfully injected into the K400 ring cyclotron to provide a 392 MeV proton beam for production of a white neutron flux and a muon beam. Several ion beams have been already used for academic research and industrial applications.}}, }