First Switching Network Unit for the JT-60SA superconducting Central Solenoid

Alessandro Lampasi, Pietro Zito, Alberto Coletti, Luca Novello, Makoto Matsukawa, Katsuhiro Shimada, Filippo Burini, Yannick Kuate Fone, Giuseppe Taddia, Sandro Tenconi

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This paper presents the main characteristics and test results of the first Switching Network Unit (SNU) of the Central Solenoid for plasma initiation in the international experiment JT-60SA. The SNU can interrupt a direct current up to 20 kA producing at its terminals a voltage up to 5 kV with a rise time shorter than 100 μs. This is obtained by synchronizing the operation of a light electromechanical contactor with a static switch in order to combine the benefits of both devices. Even though the design was based on the JT-60SA specifications, the adopted solutions can be extended to many fusion and industrial applications. Due to the novelty of the developed solutions, an exhaustive set of tests were performed both on relevant single devices and on the complete SNU, even at full current, full voltage and full energy. The most relevant tests were performed using the Frascati Tokamak Upgrade (FTU) facilities reproducing the JT-60SA operating conditions. As the presented tests demonstrated the capabilities of the SNU to comply with the requirements, the manufacturing of the remaining three Central Solenoid SNUs can proceed and is expected to be completed by 2015.
Original languageEnglish
Pages (from-to)1098 - 1102
Number of pages5
JournalFusion Engineering and Design
Publication statusPublished - 1 Oct 2015
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Lampasi, A., Zito, P., Coletti, A., Novello, L., Matsukawa, M., Shimada, K., ... Tenconi, S. (2015). First Switching Network Unit for the JT-60SA superconducting Central Solenoid. Fusion Engineering and Design, 98-99, 1098 - 1102.