Nuclear Engineering and Technology

  • 제56권1호
  • /
  • Pages.70-77
  • /
  • 2024
  • /
  • 1738-5733(pISSN)
  • /
  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
권호 표지
DOI QR코드

DOI QR Code

Development of a low energy ion irradiation system for erosion test of first mirror in fusion devices

  • 투고 : 2023.08.21
  • 심사 : 2023.09.07
  • 발행 : 2024.01.25
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

A low energy ion irradiation system based on the deuterium arc ion source with a high perveance of 1 µP for a single extraction aperture has been successfully developed for the investigation of ion irradiation on plasma-facing components including the first mirror of plasma optical diagnostics system. Under the optimum operating condition for mirror testing, the ion source has a beam energy of 200 eV and a current density of 3.7 mA/cm2. The ion source comprises a magnetic cusp-type plasma source, an extraction system, a target system with a Faraday cup, and a power supply control system to ensure stable long time operation. Operation parameters of plasma source such as pressure, filament current, and arc power with D2 discharge gas were optimized for beam extraction by measuring plasma parameters with a Langmuir probe. The diode electrode extraction system was designed by IGUN simulation to optimize for 1 µP perveance. It was successfully demonstrated that the ion beam current of ~4 mA can be extracted through the 10 mm aperture from the developed ion source. The target system with the Faraday cup is also developed to measure the beam current. With the assistance of the power control system, ion beams are extracted while maintaining a consistent arc power for more than 10 min of continuous operation.

키워드

과제정보

This research was supported by KAERI Institutional Program (Project No.524410-23), national R&D program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (2020M2D1A1064180), and by Ministry of Science and ICT of Korea, through the ITER project Contract (RS-2022-00154842). The views and opinions expressed herein do not necessarily reflect those of the ITER organization.

참고문헌

  1. A. Litnovsky, et al., Diagnostic mirrors for ITER: research in the frame of international tokamak physics activity, Nucl. Fusion 59 (2019), 066029.
  2. A. Litnovsky, et al., Firtst tests of diagnostic mirrors in a tokamak diverter: an overview of experiments in DIII-D, Fusion Eng. Des. 83 (2008) 79-89. https://doi.org/10.1016/j.fusengdes.2007.06.042
  3. Y. Zhou, et al., Study of first mirror exposure and protection in HL-2A tokamak, Fusion Eng. Des. 81 (2006) 2823-2826. https://doi.org/10.1016/j.fusengdes.2006.07.030
  4. V. Kotov, Engineering estimates of impurity fluxes on the ITER port plugs, Nucl. Fusion 56 (2016).
  5. J.-S. Park, X. Bonnin, R. Pitts, Assessment of ITER divertor performance during early operation phases, Nucl. Fusion 61 (2020), 016021.
  6. Changrae Seon, et al., Design of ITER divertor VUV spectrometer and prototype test at KSTAR tokamak, Eur. Phys. J. D 71 (2017) 313.
  7. Changrae Seon, et al., Test of prototype ITER vacuum ultraviolet spectrometer and its application to impurity study in KSTAR plasma, Rev. Sci. Instrum. 85 (2014) 11E403.
  8. Sung-Ryul Huh, et al., Development of a Cs-free negative hydrogen ion source system using multi-pulsed plasma sources, Rev. Sci. Instrum. 93 (2022), 063503.
  9. R. Becker, W.B. Herrannsfeldt, IGUN-A program for the simulation of positive ion extraction including magnetic fields, Rev. Sci. Instrum. 63 (4) (1992) 2756-2758. https://doi.org/10.1063/1.1142795
  10. A. Fridman, L.A. Kennedy, Plasma Physics and Engineering, second ed., 2011. Boca Raton.
  11. F.F. Chen, J.P. Chang, Langmuir probes, in: Lecture Notes on Principle of Plasma Processing, Springer, Boston, MA, 2003.