WEA —  Magnet Design, RF and Upgrades   (25-Sep-19   08:30—09:40)
Chair: Y. Jongen, IBA, Louvain-la-Neuve, Belgium
Paper Title Page
Future of High Field Superconducting Magnets  
  • G.L. Sabbi
    LBNL, Berkeley, California, USA
  Funding: Work supported by the US Department of Energy under contract DE-AD03-76SF00098.
Excellent mechanical and electrical properties make Niobium-Titanium (NbTi) the preferred conductor for accelerator magnets with operating fields up to 8 T. In order to surpass this threshold, materials with higher critical field are required. Among these, Niobium-Tin (Nb3Sn) is in the most advanced state of development. Nb3Sn wires carry sufficient current densities to sustain coil windings operating in the 15 T range, and can be produced in multi-km lengths with uniform properties. Following extensive R&D programs, Nb3Sn technology is enabling a 10-fold increase of the LHC luminosity, opening the way to its application in future higher energy colliders. The use of High Temperature Superconductors such as YBCO and Bi-2212 is also being actively explored to surpass the intrinsic limits of Nb3Sn. While these materials can in principle support operating fields well above 20 T, many technological challenges need to be addressed to exploit their fundamental properties in practical magnet designs. The most significant achievements to date, remaining issues and future directions are discussed.
slides icon Slides WEA01 [6.384 MB]  
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WEA02 The Developments of the RF System Related to the K-800 Superconducting Cyclotron Upgrade 262
  • A.C. Caruso, L. Calabretta, G. Costa, G. Gallo, A. Longhitano, D. Rifuggiato, A. Spartà, G. Torrisi, E. Zappalà
    INFN/LNS, Catania, Italy
  The K-800 superconducting cyclotron has been in operation at Laboratori Nazionali del Sud for almost 25 years. It has been subjected to continuous upgrades and modifications since 1994: the RF couplers have been redesigned, the new dees have been changed from aluminium to copper, as has the new central region from radial to axial injection of the beam, the hybrid configuration solid state - tube of the power amplifiers, the digital LLRF, etc. The next scheduled important upgrade of the Cyclotron mainly consists in a new extraction beam line able to support the increase of the beam current intensity. The accelerated beam will be extracted in two ways: by stripper and by electrostatic deflector and, consequently, one of the most important features of the new upgrade is the new cryostat. Further upgrades and refurbishments of the other main parts of the cyclotron, such as a new liner, the modification of the RF cavities and dees, the refurbishment of HLRF-LLRF, the insertion of the stripper extraction system, to name but a few, are in progress, too. This work focuses on the RF system upgrade.  
slides icon Slides WEA02 [10.816 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-Cyclotrons2019-WEA02  
About • paper received ※ 15 September 2019       paper accepted ※ 25 September 2019       issue date ※ 20 June 2020  
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Design for Upgrading the RCNP AVF Cyclotron  
  • M. Fukuda, S. Hara, T. Hara, K. Hatanaka, K. Kamakura, H. Kanda, H.W. Koay, S. Morinobu, Y. Morita, K. Nagayama, M. Nakao, K. Omoto, T. Saito, K. Takeda, H. Tamura, D. Tomono, Y. Yasuda, T. Yorita
    RCNP, Osaka, Japan
  The upgrade program of the RCNP K140 AVF cyclotron was started in 2019 to provide a high-quality intense beam for nuclear physics experiments and ion beam applications such as RI production and soft-error rate testing of semiconductor devices. The beam quality and intensity will be improved by increasing an extraction voltage of ion sources from 15 to 50 kV. The axial beam injection system will be modified to meet the condition of the increased injection energy. A single Dee electrode with a span angle of 180 degrees will be replaced by two 87 degree Dee electrodes. A new RF resonator was designed to cover a frequency range from 18 to 36 MHz to accelerate staple particles using acceleration harmonic mode of h=2 which maximizes the energy gain and turn separation by the double Dee system. A sub-harmonic bunching system will be applied to an injected beam to match the particle revolution frequency with that of the K400 ring cyclotron. Two gradient correctors will be placed in the extraction region to implement double-focusing for matching the extracted beam to the MEBT system. In this paper, the detailed design of the upgraded AVF cyclotron will be discussed.  
slides icon Slides WEA03 [18.161 MB]  
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