Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Finite Element Analysis of RF Coupler in Normal-Low Temperature

상온-저온 RF 커플러 유한요소해석

  • Kim, Hansol (School of Mechanical Engineering, Yonsei Univ.) ;
  • Lee, Hak Yong (School of Mechanical Engineering, Yonsei Univ.) ;
  • Park, Chan (School of Mechanical Engineering, Yonsei Univ.) ;
  • Lee, Jaeyeol (School of Mechanical Engineering, Yonsei Univ.) ;
  • Lim, Dong Yeal (School of Mechanical Engineering, Yonsei Univ.) ;
  • Yoo, Jeonghoon (School of Mechanical Engineering, Yonsei Univ.) ;
  • Hyun, Myung Wook (Rare Isotope Science Project, Institute of Basic Science)
  • 김한솔 (연세대학교 기계공학부) ;
  • 이학용 (연세대학교 기계공학부) ;
  • 박찬 (연세대학교 기계공학부) ;
  • 이재열 (연세대학교 기계공학부) ;
  • 임동열 (연세대학교 기계공학부) ;
  • 유정훈 (연세대학교 기계공학부) ;
  • 현명욱 (기초과학연구원)
  • Received : 2014.04.23
  • Accepted : 2014.06.25
  • Published : 2014.10.01
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Abstract

A heavy ion accelerator is a device that accelerates heavy ions in the radio frequency (RF) range. The electric field that flows into the RF cavity continuously accelerates heavy ions in accordance with the phase of the input electromagnetic wave. For the purpose, it is necessary to design a coupler shape that can stably transfer the RF wave into the cavity. The RF coupler in a heavy ion accelerator has a large temperature difference between the input port and output port, which radiates the RF waves. It is necessary to consider the heat deflection on the RF coupler that occurs as a result of the rapid temperature gradient from an ultra-low temperature about 0 K to a room temperature about 300 K. The purpose of this study was to improve the system performance through an analysis of the intensity of the output electric field and temperature distribution considering various shapes of the RF coupler, along with an analysis of the durability considering the heat deflection and heat loss.

중이온 입자가속기는 중이온을 radio frequency (RF) 주파수로 가속하는 장치이다. RF 공동부에 인가된 전기장은 입력된 RF 파에 의해 전자기파의 위상에 맞춰 중이온을 연속적으로 가속한다. 이를 위해서는 안정적으로 RF 파를 공동부 내부에 전달할 수 있는 커플러의 형상설계가 요구된다. 중이온 가속기에서의 RF 커플러는 입력부와 RF 주파수의 파를 방출하는 커플러 양 끝단 간의 온도차이가 매우 크다. 이 온도차를 극복하기 위해선 초저온(약 0K)부터 상온 간(약 300K)의 열 변형을 고려한 해석 및 설계기술이 필요하다. 본 연구는 RF 커플러의 구조에 따른 출력 전기장의 세기와 온도 분포, 열 손실과 열 변형을 고려한 내구도 분석을 통해 성능 향상을 위한 방안들을 도출하는 것을 목적으로 하였다.

Keywords

References

  1. Kako, E., Noguchi, S., Sato, M., Shishido, T., Watanabe, K., Yamamoto, Y., Jenhani H. and Zhao, T. X., 2009, "Advances and Performance of Input Coupler at KEK," Proceedings of SRF 2009, Vol. 9, pp. 486-490.
  2. Veshcherevich, V., Bazarov, I., Belomestnykh, S., Liepe, M., Padamsee, H. and Shemelin, V., 2003, "Input Coupler for ERL Injector Cavities," Proceedings of 2003 Particle Accelerator Conference, Vol. 2, pp. 1201-1203
  3. Alesini, D., 2010, "Power Coupling," Proceedings of CAS'10: RF for Accelerators
  4. Przybyla, J., 2009, "COMSOL Multiphysics enhances design process at e2v technologies," COMSOL Conference 2009
  5. Arkan, T., Ginsburg, C. M., Grassellino, A., Kazakov, S., Khabibouline, T., Nicol, T., Orlov, Y., Peterson, T., Ristori, L., Romanenko, A., Rowe, A., Solyak, N., Sukhanov, A. and Yakovlev, V., 2013, "SRF Development for a MW Proton Source at FERMI National Accelerator Laboratory," Proceedings of IPAC2013, pp. 2423-2425
  6. Kazakov, S., Pronitchev, O, Cheban, S., Kramp, M., Poloubotko, V., Champion, M. S., Yakovlev, V. P., Khabiboulline, T. N., and Orlov, Y., 2012, "Main Coupler for Project X," Proceedings of IPAC2012, pp. 2324-2326
  7. Hiatt, T., Breth, M., Drury, M., Getz, R., Phillips, L., Preble, J., Takacs, J., Schneider, W., Whitehead, H., Wiseman, M. and Wu, G., 2001, "Cryogenic testing of the RF Input Waveguide for the CEBAF Upgrade Cryomodule," Proceedings of 2001 Particle Accelerator Conference, Vol. 2, pp. 1155-1157
  8. Humphries, S. Jr., 1997, Finite-element Methods for Electromagnerics, CRC Press, Boca Raton
  9. Veshcherevich, V. and Belomestnykh, S., 2009, "Input Coupler for Main Linac of Cornell ERL," Proceedings of SRF 2009, pp. 544-545
  10. Holzbauer, J., 2012, RF Theory and Design-Notes, U.S. Particle Accelerator School, Grand Rapids