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Present status of the negative ion based NBI system for long pulse operation on JT-60U

机译：基于负离子的NBI系统在JT-60U上进行长脉冲操作的现状

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The 500 keV negative-ion based neutral beam injector for JT-60U started operations in 1996. The availability of the negative ion based neutral beam injection system has been improved gradually by modifying the ion source and optimizing its operation parameters. Recently, the extension of the pulse duration up to 30 s has been intended to study quasi-steady state plasma on JT-60U. The most serious issue is to reduce the heat load on the grids for tong pulse operation. Two modifications have been proposed to reduce the heat load. One is to suppress the spread of beamlet-bundle which may be caused by beamlet-beamlet interaction in the multi-aperture grid due to the space charge force. Indeed, the investigation of the beam deflection, which was measured by the infrared camera on the target plate set 3.5 m away from the grid, indicates that the spread of beamlet-bundle is in proportion to the current density. Field-shaping plates were attached on the extraction grid to modify the local electric field. The plate thickness was optimized to steer the beamlet deflection. The other is to reduce the stripping loss, where the electron of the negative ion beam is stripped and accelerated in the accelerator and then collides with the grids. The ion source was modified to reduce the pressure in the accelerator column to suppress the beam-ion stripping loss. To date, long pulse injection of 19 s of 1.5-1.6 MW at a high energy beam of 360 keV, 9-10 A for D- has been obtained by one ion source with these modifications.
机译：用于JT-60U的基于500 keV负离子的中性束注入器于1996年开始运行。通过修改离子源并优化其运行参数，逐步改善了基于负离子的中性束注入系统的可用性。最近，将脉冲持续时间延长到30 s的目的是研究JT-60U上的准稳态等离子体。最严重的问题是减少用于钳式脉冲操作的电网的热负荷。已经提出了两种修改以减少热负荷。一种是抑制由于空间电荷力而在多孔径网格中由子束-子束相互作用引起的子束-束的散布。确实，对光束偏转的研究是由红外摄像机在距网格3.5 m的靶板上进行的，测量结果表明，子束束的扩散与电流密度成正比。将场整形板连接到抽气格栅上，以修改局部电场。优化了板的厚度，以控制小束偏转。另一个是减少剥离损失，在该剥离中，负离子束的电子在加速器中被剥离并加速，然后与栅极碰撞。修改离子源以降低加速器塔中的压力，以抑制离子束汽提损失。迄今为止，通过一种离子源进行了这些修改，在360 keV的高能束下D-的9-10 A的高能束下，进行了19 s 1.5-1.6 MW的长脉冲注入。

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