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Lower hybrid current drive at high density in Alcator C-Mod

机译:在Alcator C-Mod中以高密度降低混合电流驱动

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摘要

Experimental observations of lower hybrid current drive (LHCD) at high density on the Alcator C-Mod tokamak are presented in this paper. Bremsstrahlung emission from relativistic fast electrons in the core plasma drops suddenly above line-averaged densities of 10~(20)m~(-3) (ω/ω_(LH) ~ 3) in single null discharges with large (≥8 mm) inner gaps, well below the density limit previously observed on limited tokamaks (ω/ω_(LH) ~ 2). Modelling and experimental evidence suggest that the absence of LHCD driven fast electrons at high density may be due to parasitic collisional absorption in the scrape-off layer (SOL). Experiments show that the population of fast electrons produced by LHCD at high density (n_e > 10~(20)m~(-3)) can be increased by operating with an inner gap of less than ~5mm with the strongest non-thermal emission in inner wall limited plasmas. A change in plasma topology from single to double null produces a modest increase in non-thermal emission at high density. Increasing the electron temperature in the periphery of the plasma (0.8 > r/a > 1.0) also results in a modest increase in non-thermal electron emission above the density limit. Ray tracing/Fokker-Planck simulations of these discharges predict the observed sensitivity to plasma position when the effects of collisional absorption in the SOL are included in the model.
机译:本文介绍了在Alcator C-Mod托卡马克上以高密度进行的低混合电流驱动(LHCD)的实验观察。在大(≥8mm)的单个零放电中,核心等离子体中相对论性快电子的致辐射发射突然下降至线平均密度10〜(20)m〜(-3)(ω/ω_(LH)〜3)之上。内部间隙,远低于以前在有限托卡克斯(ω/ω_(LH)〜2)上观察到的密度极限。建模和实验证据表明,LHCD驱动的快速电子在高密度下不存在,可能是由于刮除层(SOL)中存在寄生碰撞吸收。实验表明,通过在小于〜5mm的内部间隙工作且非热发射最强,LHCD产生的高密度(n_e> 10〜(20)m〜(-3))快速电子的种群可以增加在内壁有限的血浆中。等离子体拓扑从单零点变为双零点会在高密度下适度增加非热辐射。等离子体周围的电子温度升高(0.8> r / a> 1.0)也会导致非热电子发射在密度极限以上的适度增加。当模型中包括SOL中碰撞吸收的影响时,这些放电的射线追踪/ Fokker-Planck模拟可预测观察到的对等离子体位置的敏感性。

著录项

  • 来源
    《Nuclear fusion》 |2011年第8期|p.314-322|共9页
  • 作者单位

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    CompX, Del Mar, CA 92014, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, USA;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, 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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