Conceptual design and analysis of remote steering system for CFETR ECRH system
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In order to optimize the operational safety and reliability of the upper launcher for the CFETR ECRH system, a design of the launcher based on the remote steering concept is currently being carried out for comparison with the front steering equivalent. This paper presents the remote steering system’s conceptual design and simulation analysis. A Square Corrugated Waveguide (SCW) of 65 × 65 mm has been designed with an optimized length of 9.35 m. By changing the relative length of the waveguide, the transmission efficiency of the SCW is optimized within the range of steering angles ±12◦. Different error factors are investigated in detail, and corresponding acceptable error ranges are provided. Considering these error factors and ignoring ohmic losses and thermal effects, the relative transmission efficiency of the SCW is estimated to be >98 % within the steering angle range. A matching steering unit for the SCW is designed, which consists of an ellipsoidal focusing mirror and a steerable flat mirror. The detailed design of the steerable mirror motion trajectory is presented. Also, the influence of the possible beam incident errors caused by the steering unit on the transmission efficiency is analyzed in detail.
Abstract
In order to optimize the operational safety and reliability of the upper launcher for the CFETR ECRH system, a design of the launcher based on the remote steering concept is currently being carried out for comparison with the front steering equivalent. This paper presents the remote steering system’s conceptual design and simulation analysis. A Square Corrugated Waveguide (SCW) of 65 × 65 mm has been designed with an optimized length of 9.35 m. By changing the relative length of the waveguide, the transmission efficiency of the SCW is optimized within the range of steering angles ±12◦. Different error factors are investigated in detail, and corresponding acceptable error ranges are provided. Considering these error factors and ignoring ohmic losses and thermal effects, the relative transmission efficiency of the SCW is estimated to be >98 % within the steering angle range. A matching steering unit for the SCW is designed, which consists of an ellipsoidal focusing mirror and a steerable flat mirror. The detailed design of the steerable mirror motion trajectory is presented. Also, the influence of the possible beam incident errors caused by the steering unit on the transmission efficiency is analyzed in detail.
참고문헌 (23)
- Y. Wan, "Overview of the present progress and activities on the CFETR", Nucl. Fusion, 57(10), pp.102009~ (2017)
- G. Zhuang, "Progress of the CFETR design", Nucl. Fusion, 59(11), pp.112010~ (2019)
- "Fusion Eng. Des", 2022, 113225~
- "Fusion Eng. Des", 2021, 112295~
- M. F. Graswinckel, "Advanced launcher design options for electron cyclotron current drive on ITER based on remote steering", Nucl. Fusion, 48(5), pp.054015~ (2008)
- W. A. Bongers, "A remotely steered millimetre wave launcher for electron cyclotron heating and current drive on, ITER", Fusion engineering and design, 85(1), pp.69~86 (2010)
- G. G. Denisov, "RF analysis of ITER remote steering antenna for electron-cyclotron plasma heating", Int. J. Infrared Millimet. Waves, 22, pp.1735~1760 (2001)
- A. V. Chirkov, "Simulation and experimental study of a remote steering system for ECRH", ECCD antenna beams, 2001, pp.53(1–4), 465~473
- K. Takahashi, "High power experiments of remote steering launcher for electron cyclotron heating and current drive", Fusion Eng. Des, 65(4), pp.589~598 (2003)
- W. Kasparek, "Performance of a remote steering antenna for ECRH", ECCD applications in ITER using a four-wall corrugated square waveguide, 2003, pp.43(11), 1505~
- M. A. Henderson, "Possible improvements to a remote steering launcher for localized electron cyclotron current drive", Fusion Sci. Technol, 53(1), pp.220~236 (2008)
- L. A. Rivlin, "Transmission of images through optical waveguides", Laser Focus, 17(2), pp.82~84 (1981)
- C.P. Moeller, "A method of remotely steering a microwave beam launcher from a highly overmoded corrugated waveguide", Proceedings of the 23rd International Conference on Infrared and Millimeter Waves, pp.116~ (1998)
- R. B. Dybdal, "IEEE trans. Microwave theory tech", IEEE Trans. Microw. Theor. Tech, 19, pp.2~9 (1971)
- K. Ohkubo, "Hybrid modes in a square corrugated waveguide", Int. J. Infrared Millimet. Waves, 22, pp.1709~1727 (2001)
- Y. Tang, "Conceptual design of CFETR electron cyclotron wave system", Fusion Eng. Des, 94, pp.48~53 (2015)
- K. Ohkubo, "Extension of steering angle in a square corrugated waveguide antenna", Fusion Eng. Des, 65(4), pp.657~672 (2003)
- Paul F., "Goldsmith, Quasi-optical Systems: Gaussian Beam Quasi-Optical Propagation and Applications" (1998), IEEE Press
- L. Rebuffi, "Radiation patterns of the HE11 mode and Gaussian approximations", Int. J. Infrared Millimeter Waves, 10(3), pp.291~311 (1988)
- N. J. McEwan, "Design of elliptical and offset reflector antennas using Gaussian beam theory", 6th Int. Con. Antennas Propagation, 301, pp.35~39 (1989)
- "Altair engineering, Inc"[URL]
- A. G. A. Verhoeven, "Design of the mm-wave system of the ITER ECRH upper launcher", Fusion Eng. Des, 74(1–4), pp.431~435 (2005)
- B. Plaum, "Design of a remote steering antenna for ECRH heating in the stellarator Wendelstein 7-X", Fusion Eng. Des, 96, pp.568~572 (2015)