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Characteristics and improved method of vacuum plug brazing for RFQ fabrication

  • Original Paper - Fluids, Plasma and Phenomenology
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Abstract

At the Korea Multi-purpose Accelerator Complex (KOMAC), a radiofrequency quadrupole (RFQ)-based compact accelerator with 1 MeV/n output energy is under development, mainly for the test stand for developing accelerator technology and studying beam physics as well as for ion beam applications including semiconductor irradiation and neutron generation. The manufacturing procedure of an RFQ is complex, including two stages of brazing; one for plugging the cooling channel and the other is part assembling. The first brazing step plays the role of annealing process as well to relieve the stress generated during machining. Securing vacuum tightness after brazing is crucial, however, we experienced several failures in the plug brazing during the fabrication of the RFQ. Therefore, we investigated the characteristics of the plug brazing by conducting specimen tests and improved the brazing method based on the test results. This paper explains the successful and reliable approach for the plug brazing of a large structure.

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Acknowledgements

The authors would like to acknowledge very helpful discussions with Dale Schrage (LANL, retired) concerning the brazing procedure. This study was supported by the Korea Multi-purpose Accelerator Complex (KOMAC) operation fund of the KAERI, the Ministry of Science and ICT (MSIT). KAERI ID no. 524320-22

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Authors and Affiliations

  1. Korea Multi-Purpose Accelerator Complex, Korea Atomic Energy Research Institute, Gyeongju, 38180, Republic of Korea

    Kyung Hyun Kim, Han Sung Kim, Hyeok Jung Kwon, Sang Pil Yoon, Hae Seong Jeong, Seong Gu Kim & Won Hyeok Jung

  2. School of Mechanical Engineering, Kyungpook National University, Bukgu, Daegu, 41566, Republic of Korea

    Jung Goo Hong

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  1. Kyung Hyun Kim
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  2. Han Sung Kim
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  3. Hyeok Jung Kwon
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  4. Sang Pil Yoon
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  5. Hae Seong Jeong
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  6. Seong Gu Kim
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  7. Won Hyeok Jung
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Correspondence to Jung Goo Hong.

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Kim, K.H., Kim, H.S., Kwon, H.J. et al. Characteristics and improved method of vacuum plug brazing for RFQ fabrication. J. Korean Phys. Soc. 81, 1240–1249 (2022). https://doi.org/10.1007/s40042-022-00658-w

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  • DOI: https://doi.org/10.1007/s40042-022-00658-w

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