Long pulse test of the KSTAR ICRF antenna with water-cooling
Long pulse test of the KSTAR ICRF antenna with water-cooling
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DOI：
10.1016/j.fusengdes.2007.02.006
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发表时间：
2007-10
期刊：
影响因子：
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通讯作者：
Y. Bae;J. Kwak;Sonjong Wang;J. Yoon;C. Hwang;Suk-Kwon Kim;B. Hong
中科院分区：
文献类型：
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作者：
Y. Bae;J. Kwak;Sonjong Wang;J. Yoon;C. Hwang;Suk-Kwon Kim;B. Hong
KSTAR ICRF（离子回旋频率范围）天线正在开发和测试高功率和长脉冲操作。在之前的测试活动中，通过对ICRF天线进行水冷，将隔离能力从24.3kVp（kV峰值）提高到31.2kVp（300 s脉冲持续时间），但受到真空馈通（VF）过热和不匹配部分传输线（没有任何冷却通道）的限制。在2005年的射频测试活动之前，开发了VF和不匹配部分传输线的水冷系统，以消除耗散的射频热负荷。为了冷却VF和输电线的中心导体，两条输电线的连接部分经过精心设计和制造，以确保不漏水并具有紧密的电气接触。在RF测试期间，冷却水由中心导体内部的同轴管供给，并且冷却水通过中心导体和同轴管之间的空间流出。电流最大值附近的外导体也通过使用内部具有冷却通道的Al冷却块进行水冷。在30 MHz的频率下进行了具有长脉冲持续时间的高压测试。电流带-1的下半部分连接到射频源，其他三个带在输入端口处短路。在300 s的运行中，达到的隔离电压为41.3kVp，这比上一次活动高得多。20 s脉冲的最大隔离电压为46.0kVp。当等离子体负载为6Ω/m时，41.3kVp的电压相当于7.4MW的加热功率。为了模拟稳态操作，还进行了长得多的脉冲测试。实验结果表明，在600 s和1000 s时，器件的隔离电压分别为35.0kVp和27.9kVp。
The KSTAR ICRF (ion cyclotron range of frequency) antenna is being developed and tested for a high-power and long pulse operation. In the previous test campaign, the standoff capability was increased to 31.2kVp(kV peak) from 24.3kVpfor a 300s pulse duration by applying water-cooling to the ICRF antenna, but it was limited by an overheating of the vacuum feedthrough (VF) and the transmission line of the unmatched section which did not have any cooling channel. Prior to the RF test campaign in 2005, water-cooling system for the VF and the transmission line of the unmatched section was developed to remove the dissipated RF heat load. For a cooling of the central conductors of the VF and transmission line, the joining part of the two transmission lines was carefully designed and fabricated to ensure no water leakage and to have a tight electrical contact. During the RF testing, a cooling water was fed by a coaxial tube inside the central conductors and it flowed out through the space between the center conductor and the coaxial tube. Outer conductors near the current maximum were also water-cooled by using Al cooling blocks which had a cooling channel inside them. The high voltage tests with long pulse durations were performed at a frequency of 30MHz. A bottom half of the current strap-1 was connected to the RF source and the other three straps were shorted at the input ports. The achieved standoff voltage was 41.3kVpfor a 300s operation, which was much higher than that of the previous campaign. The maximum standoff voltage for a 20s pulse was 46.0kVp. A voltage of 41.3kVpis equivalent to a heating power of 7.4MW in the case of a plasma loading of 6Ω/m. To simulate a steady state operation, much longer pulse tests were also performed. As a result, we achieved standoff voltages of 35.0kVpfor 600s and 27.9kVpfor 1000s.