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Negative ion RF sources for ITER NBI: status of the development and recent achievements

机译：ITER NBI的负离子射频源：发展现状和近期成就

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For heating and current drive the neutral beam injection system for ITER requires a deuterium beam with an energy of 1 MeV for up to 1 h. In order to inject the required 17 MW the ion source has to deliver 40 A of negative ion current. For an accelerated current density of 200 A m(-2) at the specified source pressure of 0.3 Pa the extraction area is 0.2 m(2) resulting in a large area source of 1.5 x 0.6 m(2). Two types of sources have been under discussion, the filamented arc source and the inductively driven RF source, the latter now having been chosen for the ITER reference design. The development of negative ion RF sources, which fulfil these specifications is being carried out at the Max-Planck-Institut fur Plasmaphysik at three test facilities in parallel. The required current densities at the ITER relevant pressure have been achieved and even exceeded in a test facility equipped with a small ion source (extraction area of 0.007 m(2)) at limited pulse length (<4 s). The extraction area can be extended up to 0.03 m(2) and the pulse length up to 3600 s at a second test facility which is dedicated to long pulse operation experiments where pulses up to 800 s have already been achieved. The ion source at the third test facility has roughly the full width and half the height of the ITER source but is not equipped with an extraction system. The aim is to demonstrate the size scaling and plasma homogeneity of RF ion sources. First results from different diagnostic techniques (optical emission spectroscopy and Langmuir probe) are very promising.
机译：为了加热和驱动电流，用于ITER的中性束注入系统需要氘束，其能量为1 MeV，持续1 h。为了注入所需的17 MW离子源，必须提供40 A的负离子电流。对于在0.3 Pa的指定源压力下200 A m（-2）的加速电流密度，提取面积为0.2 m（2），从而产生1.5 x 0.6 m（2）的大面积源。目前正在讨论两种类型的信号源，即灯丝电弧源和感应驱动RF源，目前已将它们选择用于ITER参考设计。 Max-Planck-Institut fur Plasmaphysik在三个测试设施中并行进行满足这些规范的负离子RF源的开发。在配备了小离子源（提取面积为0.007 m（2））的有限脉冲长度（<4 s）的测试设备中，在ITER相关压力下已达到甚至超过了所需的电流密度。在第二个测试设备上，提取面积可以扩展到0.03 m（2），脉冲长度可以达到3600 s，该设备专门用于长脉冲操作实验，其中已经实现了800 s的脉冲。第三个测试设施中的离子源大约具有ITER离子源的整个宽度和一半的高度，但未配备提取系统。目的是证明RF离子源的尺寸缩放和等离子体均匀性。来自不同诊断技术（光发射光谱法和Langmuir探针）的初步结果非常有希望。

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