In the previous divertor campaign, the Wendelstein 7-X (W7-X) device injected 3.6MW of neutral beam heating power allowing for the achievement of densities approaching 2 10²⁰m⁻³, and providing the first initial assessment of fast ion confinement in a drift optimized stellarator. The neutral beam injection (NBI) system on W7-X is comprised of two beam boxes with space for four radio frequency sources each. The 3.6MW of heating reported in this work was achieved with two sources in the NI21 beam box. The effect of combined electron-cyclotron resonance heating (ECRH) and NBI was explored through a series of discharges varying both NBI and ECRH power. Discharges without ECRH saw a linear increase in the line-integrated plasma density, and strong peaking of the core density, over the discharge duration. The presence of 1MW of ECRH power was found to be sufficient to control a continuous density rise during NBI operation. Simulations of fast ion wall loads were found to be consistent with experimental infrared camera images during operation. In general, NBI discharges were free from the presence of fast ion induced Alfvnic activity, consistent with low beam betas. These experiments provide data for future scenario development and initial assessment of fast-ion confinement in W7-X, a key topic of the project.

在之前的偏滤器活动中，Wendelstein 7-X (W7-X) 装置注入了 3.6MW 的中性光束加热功率，从而实现了接近 2 10 ²⁰ m ^-3的密度，并提供漂移优化仿星器中快速离子约束的首次初始评估。W7-X 上的中性射束注入 (NBI) 系统由两个射束箱组成，每个射束箱空间可容纳四个射频源。在这项工作中报告的 3.6MW 加热是通过 NI21 梁箱中的两个源实现的。通过一系列改变 NBI 和 ECRH 功率的放电，探索了组合电子回旋共振加热 (ECRH) 和 NBI 的影响。在没有 ECRH 的情况下，放电过程中，线积分等离子体密度呈线性增加，并且核心密度出现强烈峰值。发现 1MW 的 ECRH 功率的存在足以控制 NBI 操作期间的连续密度上升。发现快速离子壁负载的模拟与操作期间的实验红外相机图像一致。一般来说，NBI 放电不存在快离子诱导的 Alfvnic 活动，这与低束 beta 一致。这些实验为 W7-X 中快离子约束的未来情景开发和初步评估提供了数据，这是该项目的一个关键主题。