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The proposed spiral antenna serves as an alternative structure to the traditional setup for launching fast waves in the SST-1 tokamak, operating at a frequency of 350 MHz. The study becomes essential to determine the impedance matching in the middle of antenna and the coaxial transmission line, considering the significant several-hundred-kilowatt continuous wave power supplied to the spiral antenna as RF input. The design of the spiral antenna adheres to the port space restrictions of SST-1. The design of the antenna is simple and compact in size. Bidirectional radiation is observed within the specified frequency band in antenna prototype. The modeling findings show that the antenna exhibits an inherent resonance frequency approximately 350 MHz, with respective reflection coefficient of ~−15 dB respectively.

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Design of an Equiangular Spiral Antenna for Efficiency Enhancement in Tokamak for Fusion Reactors

  • 会议论文

  • 发表日期：

    2025年

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  • Dimple Yadav,
  • Poonam Tiwari,
  • Vaishali,
  • Meenu Kaushik,
  • Raj Singh,
  • Vishant Gahlaut

摘要

The proposed spiral antenna serves as an alternative structure to the traditional setup for launching fast waves in the SST-1 tokamak, operating at a frequency of 350 MHz. The study becomes essential to determine the impedance matching in the middle of antenna and the coaxial transmission line, considering the significant several-hundred-kilowatt continuous wave power supplied to the spiral antenna as RF input. The design of the spiral antenna adheres to the port space restrictions of SST-1. The design of the antenna is simple and compact in size. Bidirectional radiation is observed within the specified frequency band in antenna prototype. The modeling findings show that the antenna exhibits an inherent resonance frequency approximately 350 MHz, with respective reflection coefficient of ~−15 dB respectively.