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首页> 外文期刊>Nuclear fusion >Experimental study on ion temperature behaviours in ECH, ICRF and NBI H_2, He and Ne discharges of the Large Helical Device
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Experimental study on ion temperature behaviours in ECH, ICRF and NBI H_2, He and Ne discharges of the Large Helical Device

机译：大型螺旋装置ECH，ICRF和NBI H_2，He和Ne放电中离子温度行为的实验研究

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摘要

Ion heating experiments have been carried out in the large helical device using ECH (82.5, 84.0, 168 GHz, ≤ 1 MW), ICRF (38.5 MHz, ≤ 2.7 MW) and NBI (H~o beam: 160 keV, ≤ 9 MW). The central ion temperature has been observed from the Doppler broadening of Ti XXI (2.61 A) and Ar XVII (3.95 A) x-ray lines, which are measured using a newly installed crystal spectrometer with a charge-coupled device. Recently, in ECH discharges, on-axis heating became possible. As a result, a high T_e(0) of 6 - 10 keV and a high ion temperature of 2.2 keV were obtained at n_e = 0.6 * 10~(13) cm~(-3). A clear increment of T_i was also observed with the enhancement of the electron-ion energy flow when the ECH pulse was added to the NBI discharge. These results demonstrate the feasibility towards ECH ignition. A clear T_i increment was observed also in ICRF discharges at low density ranges of (0.4 - 0.6) * 10~(13) cm~(-3) with appearance of a new operational range of T_i(0) = 2.8 keV > Te(0) = 1.9 keV. In low power ICRF heating (1 MW), the fraction of bulk ion heating is estimated to be 60% of the total ICRF input power, which means P_i > P_e. Higher T_i(0), up to 3.5 keV, was obtained for a combined heating of NBI (< 4 MW) and ICRF (1 MW) at density ranges of (0.5 - 1.5) * 10~(13) cm~(-3). The highest T_i(0) of 5 keV was recorded in Ne NBI discharges at n_e < 1 * 10~(13) cm~(-3) with the achievement of T_i(0) > T_e(0), whereas the T_i(0) remained at relatively low values of 2keV in H_2 and He NBI discharges due to less P_i. The main reasons for the high T_i achievement in the Ne discharges are: (1) 30% increment of deposition power, (2) increase in P_i_i (five times, P_i_i P_E_e, P_i < P_e) and (3) increase in τ_(ei) (three times). The obtained T_i(0) data can be plotted by a smooth function of P_i_i. This result strongly suggests that the ion temperature increases even in the H_2 discharge if the P_i can be raised up.
机译：已在大型螺旋装置中使用ECH（82.5、84.0、168 GHz，≤1 MW），ICRF（38.5 MHz，≤2.7 MW）和NBI（H〜o光束：160 keV，≤9 MW）进行了离子加热实验）。从Ti XXI（2.61 A）和Ar XVII（3.95 A）X射线线的多普勒展宽中观察到了中心离子温度，这是使用新安装的带有电荷耦合器件的晶体光谱仪测量的。最近，在ECH放电中，同轴加热成为可能。结果，在n_e = 0.6 * 10〜（13）cm〜（-3）时，获得了6-10 keV的高T_e（0）和2.2 keV的高离子温度。当将ECH脉冲添加到NBI放电时，随着电子离子能量流的增强，还观察到T_i的明显增加。这些结果证明了ECH点火的可行性。在低密度范围（0.4-0.6）* 10〜（13）cm〜（-3）的ICRF放电中也观察到了明显的T_i增量，并且出现了新的工作范围T_i（0）= 2.8 keV> Te（ 0）= 1.9 keV。在低功率ICRF加热（1 MW）中，体离子加热的比例估计为ICRF总输入功率的60％，这意味着P_i> P_e。在（0.5-1.5）* 10〜（13）cm〜（-3）的密度范围内对NBI（<4 MW）和ICRF（1 MW）进行联合加热时，可获得更高的T_i（0），最高可达3.5 keV。 ）。在N_e <1 * 10〜（13）cm〜（-3）的Ne NBI放电中记录到最高的5 keV的T_i（0），实现了T_i（0）> T_e（0），而T_i（0 ）在H_2中保持在相对较低的2keV值，并且由于P_i较小，He NBI放电。在Ne放电中获得高T_i的主要原因是：（1）沉积功率增加30％，（2）P_i / n_i增加（五倍，P_i / n_i P_E / n_e，P_i

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  • 来源
    《Nuclear fusion》 |2003年第9期|p. 899-909|共11页
  • 作者

    S. Morita; M. Goto; Y. Takeiri; J. Miyazawa; S. Murakami; K. Narihara; M. Osakabe; K. Yamazaki; T. Akiyama; N. Ashikawa;

  • 作者单位

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

    Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan;

    National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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