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Obtaining reactor-relevant divertor conditions in tokamaks

机译：在托卡马克中获得与反应堆有关的分流器条件

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It is argued that the paramount boundary plasma issue for DT reactors is likely to be the erosion wear of the plasma facing components, PFCs, and that a number of potential solutions all require the achievement of not only low temperature ((≤)10eV) but also high density ((≥)10~(21) m~(-3)) in the divertor. Estimates are made of the minimum heating power, P_(heat), required to achieve a divertor target temperature of T_t = 5eV and density n_t > 10~(21) m~(-3), based on four recent hypotheses or scalings for the width of the power footprint on the target, λ_(qt). Each of these result in predictions of how the required minimum P_(heat depends on device size, namely as R, R~(3/2) or R~2. The absolute magnitude for the required values of minimum P_(heat is found not to vary significantly among the four power scalings; for the most part a factor of order ～2 for a significant range of R. The four hypotheses/scalings for λ_(qt) are empirically based; however, they draw on measurements made in tokamaks that did not have divertors operating primarily under these conditions. In order to establish if any of these power scalings are applicable, they are compared with measurements from a set of DIII-D discharges with high n_t ～ 0.35 x 10~(21) at 5 eV. It is found that all four power scalings match the experimental measurements to within the uncertainties. The main objective is to determine what power is needed to achieve the required divertor conditions in future devices, for both reactor and simulator tokamaks, and therefore the approximate agreement of the four, strongly empirical, power scalings increases confidence that this may be possible.
机译：有人认为，DT反应器的最重要的边界等离子体问题很可能是面对等离子体的部件PFC的腐蚀磨损，而且许多潜在的解决方案都要求不仅达到低温（（≤）10eV），而且要求达到偏滤器中的密度也很高（（≥）10〜（21）m〜（-3））。根据最近的四个假设或标定，估算了达到散热器目标温度T_t = 5eV和密度n_t> 10〜（21）m〜（-3）所需的最小加热功率P_（heat）。目标上功率足迹的宽度，λ_（qt）。所有这些都可以预测所需的最小P_（热量取决于器件尺寸，即R，R〜（3/2）或R〜2。对于所需的最小P_（热量）的绝对大小没有发现λ_（qt）的四个假设/标度是基于经验的；但是，它们基于托卡马克中的测量值为了确定这些功率定标是否适用，将其与一组在5 eV时n_t〜0.35 x 10〜（21）高的DIII-D放电的测量结果进行比较，以确定是否适用这些功率定标。发现所有四个功率标度都与实验测量值相吻合，其主要目标是确定在未来设备中，对于反应堆和模拟器托卡马克，需要什么功率才能达到所需的分流器条件，因此近似协议的t四个强烈经验的功率定标使人们更有信心这是可能的。

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  • 来源
    《Nuclear fusion》 |2011年第6期|p.3.1-3.16|共16页
  • 作者

    P.C. Stangeby; A.W. Leonard;

  • 作者单位

    University of Toronto Institute for Aerospace Studies, Toronto, M3H 5T6, Canada;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

  • 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
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