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Investigation of Oxygen-Induced-Arcing in Cs-Seeded Negative Ion Source

机译：Cs播种负离子源中氧致电弧的研究

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High-power and long-pulse arc discharges of 150 kW for 100 s have been achieved for the first time by suppressing oxygen-induced-arcing which was one of the critical issues on JT-60SA negative ion source. Toward the realization of such arc discharge, the suppression of recycling of oxygen from the arc chamber wall was found to be a key issue in the large-size arc-driven negative ion source. Because the experimental results showed that this oxygen was derived from release of water due to high temperature chamber wall of heated by an arc discharge, the baking of the arc chamber was tried to reduce water adsorbing to the chamber before the long-pulse discharge. After the baking at 80 ?C for 8 hours, since the oxygen level was reduced to half of that before baking, the available pulse duration became twice longer. By combining this baking and long-pulse conditioning shots, the stable long-pulse arc discharge has been obtained. This result contributes to the improvement of availability of the large-size negative ion sources which require long-conditioning time.
机译：通过抑制氧气诱发的电弧，这是JT-60SA负离子源的关键问题之一，首次实现了150 kW的高功率和长脉冲电弧放电100 s。为了实现这种电弧放电，发现抑制来自电弧室壁的氧气的再循环是大型电弧驱动负离子源中的关键问题。由于实验结果表明，这种氧气是由于电弧放电对高温腔室壁进行加热而释放出的水而产生的，因此试图对电弧腔室进行烘烤以减少长脉冲放电之前水对腔室的吸附。在80°C烘烤8小时后，由于氧气水平降低到烘烤前的一半，因此可用脉冲持续时间变长了两倍。通过结合烘烤和长脉冲调理喷丸，可以获得稳定的长脉冲电弧放电。该结果有助于改善需要长时间调节的大型负离子源的可用性。

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