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Third harmonic EC heating of ELMy H-mode in TCV

机译：TCV中ELMy H模式的三次谐波EC加热

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摘要

Ohmic H-mode discharges in the Tokamak Configuration Variable (TCV) have recently been heated for the first time by electron cyclotron (EC) waves at the 3rd harmonic (X3) at full power. New edge localized mode (ELM) behaviour has been found, with larger amplitudes at lower frequency than are typical in ohmic H-modes. This new regime required the full available X3-EC Heating (X3-ECH) power to avoid the ELM-free phase, which occurred when less heating power was applied. The energy loss per ELM can be up to 15% of the total stored energy, with values in the range 4-5% being typical of the smaller ELMs usually found in the ohmic H-mode regime. Despite these high-energy losses, the plasma temperature raises significantly in the X3 heated H-modes, doubling the stored energy from its ohmic value. The confinement time decreases when the ECH is applied, but can recover its ohmic H-mode value later in the discharge depending on the EC wave coupling. It is still not possible to provide an unambiguous classification of these ELMs as Type I.
机译：最近，托卡马克配置变量（TCV）中的欧姆H型放电首次被电子回旋加速器（EC）波以三次谐波（X3）的全功率加热。已经发现了新的边缘局部模式（ELM）行为，其在较低的频率下具有比欧姆H模式下的典型模式更大的幅度。此新方案要求使用全部可用的X3-EC加热（X3-ECH）功率，以避免在施加较少的加热功率时发生的无ELM相。每个ELM的能量损耗最多可占总存储能量的15％，其值在欧姆H模式下通常会发现的较小ELM的典型值在4％至5％之间。尽管有这些高能量损耗，但在X3加热的H模式下，等离子体温度仍显着升高，使存储的能量从其欧姆值增加了一倍。施加ECH时，限制时间会减少，但根据EC波耦合，放电后期可以恢复其欧姆H模式值。仍然不可能将这些ELM明确分类为I型。

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