Improvement of the RF cavity for the SKKUCY-10 cyclotron

• Published in: Journal of the Korean Physical Society Vol. 79; no. 9; pp. 857 - 863
• Main Authors: Lee, Jongchul, Ghergherehchi, Mitra, Gad, Khaled M. M., Ha, Donghyup, Namgoong, Ho, Lee, Seunghyun, Song, Ho Seung, Karatas, Berat Can, Chai, Jong-Seo
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.11.2021; Springer Nature B.V; 한국물리학회
• Subjects: Continuous radiation; Couplers; Coupling coefficients; Mathematical and Computational Physics; Original Paper; Particle and Nuclear Physics; Physics; Physics and Astronomy; Radioisotopes; Reflectance; Resonant frequencies; Theoretical; 물리학; RF cavity; Cyclotron; RF conditioning; Coupling coefficient; Resonant frequency
• ISSN: 0374-4884; 1976-8524
• DOI: 10.1007/s40042-021-00246-4

The SKKUCY-10 cyclotron based on 83.2 MHz, 40 kV half-wave RF cavity was developed at Sungkyunkwan University for the production of medical radioisotopes. The resonant frequency f RF of the cyclotron and the RF coupling coefficient β c of the RF cavity system were measured at various vacuum, and temperature conditions. The normalized multi-pacting intensities at four positions in the power coupler were analyzed to predict the multi-pacting power. Differences, Δ f RF and Δ β c , caused by the vacuum, and temperature conditions were modified based on the coupler and tuner gap distances. During the RF conditioning, a constant 15 kW pulse mode and a variable 1 to 15 kW continuous wave mode were employed. The values of the reflection coefficient Γ and β c were 1.2% and 0.8, respectively, when the cavity dissipation power was 12.4 kW at 83.2 MHz. Good agreement between the simulation and experimental data was obtained.