Results of two LANL [beta]=0.175, 350-MHZ, 2-GAP spoke cavities

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Two {beta} = 0.175, 350 MHz, 2-gap superconducting (SC) spoke cavities were fabricated in industry under the Advanced Accelerator Applications (AAA) project for the transmutation of nuclear waste. These cavities are promising candidates for the accelerating structures between a RFQ and the elliptical SC cavities for proton and heavy ion linacs. Since their delivery in July 2002, they have been tested in terms of mechanical properties, low-temperature performance, i.e., Qo-Eaccc urves at 4 K and 2 K, surface resistance dependence on temperature and for multipacting (MP). The two cavities achieved accelerating fields of 13.5 MV/m and 13.0 MV/m as compared ... continued below

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Tajima, T. (Tsuyoshi); Edwards, R. L. (Randall L.); Gentzlinger, R.C. (Robert C.); Krawczyk, F. L. (Frank L.); Ledford, J. E. (John E.); Liu, Jianfei et al. January 1, 2003.

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Two {beta} = 0.175, 350 MHz, 2-gap superconducting (SC) spoke cavities were fabricated in industry under the Advanced Accelerator Applications (AAA) project for the transmutation of nuclear waste. These cavities are promising candidates for the accelerating structures between a RFQ and the elliptical SC cavities for proton and heavy ion linacs. Since their delivery in July 2002, they have been tested in terms of mechanical properties, low-temperature performance, i.e., Qo-Eaccc urves at 4 K and 2 K, surface resistance dependence on temperature and for multipacting (MP). The two cavities achieved accelerating fields of 13.5 MV/m and 13.0 MV/m as compared to the required field of 7.5 MV/m with enough margin for the quality factor. These cavities seem to need more time to condition away MP than elliptical cavities, but MP does not occur once the cavity is conditioned and kept at 4 K. The length of the 103 mm-diameter nominal coupler port was found to be too short for the penetrating field.

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  • Submitted to: 2003 Particle Accelerator Conference (PAC2003), Portland, OR, May 12-16, 2003

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  • Report No.: LA-UR-03-3081
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976645
  • Archival Resource Key: ark:/67531/metadc935413

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  • January 1, 2003

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 1 p.m.

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Tajima, T. (Tsuyoshi); Edwards, R. L. (Randall L.); Gentzlinger, R.C. (Robert C.); Krawczyk, F. L. (Frank L.); Ledford, J. E. (John E.); Liu, Jianfei et al. Results of two LANL [beta]=0.175, 350-MHZ, 2-GAP spoke cavities, article, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc935413/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.