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Role of fast waves in the central deposition of lower hybrid power

机译：快速波在较低混合动力中心沉积中的作用

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In tokamaks, lower hybrid (LH) waves are routinely used for current drive and heating of plasmas. The LH waves have two modes of propagation that are called the slow and the fast wave. Usually, the lower hybrid waves are launched as slow waves into a tokamak, but during the propagation part of the wave power can be transformed to fast waves. General characteristics of the mode transformation of slow waves to fast waves are first investigated with a simple quasitoroidal ray-tracing model. Next, the effect of mode transformed LH power on the deposition profiles in a JET-like tokamak is analysed by using the fast ray-tracing code FRTC. When the launched spectrum is at small values of the toroidal refractive index (1.6 less than or similar to n(phi 0) less than or similar to 2.0), the contribution of the fast wave to the deposited power is found to be significant and responsible for most of the absorption at the centre. When n(phi 0) is large (n(phi 0) greater than or similar to 2.2), the effect of the-mode transformed fast waves is small or negligible. At modest central densities (n(e0) similar to 0.5 x 10(20) m(-3)), the contribution of the fast wave to the power deposition can be more than 50% in the plasma centre. In consequence, the significant amount of wave energy absorbed in the fast mode must be carefully taken into account in modelling LH current drive experiments in the future. At low central densities (n(e0) less than or similar to 0.3 x 10(20) m(-3)), practically no absorption of fast waves occurs. [References: 17]
机译：在托卡马克中，低杂波（LH）波通常用于电流驱动和等离子体加热。 LH波具有两种传播模式，分别称为慢波和快波。通常，较低的混合波会以慢波的形式发射到托卡马克中，但是在传播过程中，波功率的一部分可以转换为快波。首先使用简单的准弦射线跟踪模型研究了慢波到快波模式转换的一般特征。接下来，通过使用快速射线追踪代码FRTC，分析了模转换LH功率对类似JET的托卡马克中的沉积轮廓的影响。当发射光谱处于环形折射率的较小值时（小于或等于n（phi 0的1.6小于或等于2.0的n）），发现快波对沉积功率的贡献显着且负责在中心的大部分吸收。当n（phi 0）大（n（phi 0）大于或类似于2.2）时，模式转换快波的影响很小或可忽略不计。在适当的中心密度（n（e0）类似于0.5 x 10（20）m（-3））下，等离子体中心的快速波对功率沉积的贡献可能超过50％。因此，将来在建模LH电流驱动实验时，必须谨慎考虑在快速模式下吸收的大量波能。在低中心密度下（n（e0）小于或等于0.3 x 10（20）m（-3）），实际上没有吸收快波。 [参考：17]

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