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<p>Installation of the gyrotron complex on the T-15MD tokamak is planned for additional plasma heating and non-inductive current drive, as well as for pre-ionization of gas at the initial stage of the discharge. Safe and reliable operation of gyrotrons requires effective protection measures not only from microwave radiation, but also from X-ray radiation generated by the gyrotrons. The article presents the results of the X-ray radiation measurements when operating a 82.6 GHz gyrotron (with a power of up to 1 MW and a pulse duration of 1 s). NaI(Tl) and LaBr3(Ce) scintillation detectors are used for recording the X-ray radiation spectra. The spectrometric analysis carried out in the gyrotron operating mode with an accelerating voltage up to U=47.6 kV showed a continuous energy distribution of X-ray radiation with a maximum in the range 15–20 keV. In standard operating modes, the maximum radiation intensity is observed near the collector, at the microwave exit window, and in the lower part of the gyrotron. Installation of protective lead shields (up to 4 mm thick), covering the entire collector area and the area of the exit window of the microwave path, provides effective shielding from the X-ray radiation.</p>

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X-ray Radiation of 82.6 GHZ Gyrotron on Tokamak T-15MD

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • P. V. Savrukhin,
  • E. A. Shestakov,
  • V. I. Tepikin,
  • P. D. Lisovoy,
  • A. V. Khramenkov,
  • I. N. Roy,
  • I. S. Pimenov

摘要

Installation of the gyrotron complex on the T-15MD tokamak is planned for additional plasma heating and non-inductive current drive, as well as for pre-ionization of gas at the initial stage of the discharge. Safe and reliable operation of gyrotrons requires effective protection measures not only from microwave radiation, but also from X-ray radiation generated by the gyrotrons. The article presents the results of the X-ray radiation measurements when operating a 82.6 GHz gyrotron (with a power of up to 1 MW and a pulse duration of 1 s). NaI(Tl) and LaBr3(Ce) scintillation detectors are used for recording the X-ray radiation spectra. The spectrometric analysis carried out in the gyrotron operating mode with an accelerating voltage up to U=47.6 kV showed a continuous energy distribution of X-ray radiation with a maximum in the range 15–20 keV. In standard operating modes, the maximum radiation intensity is observed near the collector, at the microwave exit window, and in the lower part of the gyrotron. Installation of protective lead shields (up to 4 mm thick), covering the entire collector area and the area of the exit window of the microwave path, provides effective shielding from the X-ray radiation.