Performance of 300聽s-beam extraction in the KSTAR neutral beam injector

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• 作者：Doo-Hee Chang^a ; ^{doochang@kaeri.re.kr} ; Seung Ho Jeong^a ; Tae-Seong Kim^a ; Kwang Won Lee^a ; Sang Ryul In^a ; Young-Soon Bae^b ; Jong-Su Kim^b ; Hyun-Taek Park^b ; Dong-Hyun Kim^b ; Hyung-Lyeol Yang^b
• 关键词：Long pulse ion source ; KSTAR ; Neutral beam injector ; Water-flow calorimetry ; Beamline component heat load ; Beam power deposition ; BTR code
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：July, 2012
• 卷：12
• 期：4
• 页码：1217-1222
• 文件大小：1620 K

摘要

The first neutral beam injector (NBI-1) has been developed for the Korea Superconducting Tokamak Advanced Research (KSTAR) tokamak. The first long pulse ion source (LPIS-1) has been installed in the NBI-1 for an auxiliary heating and current drive of KSTAR plasmas. The performance of 300聽s ion beam extraction in the LPIS-1 was investigated on the KSTAR NBI-1 system, prior to the neutral beam injection for long pulse operation. The ion source consists of a magnetic bucket plasma generator with multi-pole cusp fields and a set of prototype tetrode accelerators with circular-type apertures. The inner volume of the plasma generator and accelerator column in the LPIS-1 is approximately 123聽L. The nominal operation requirements for the ion source (IS) were a 100聽kV/50聽A deuterium beam and a 300聽s pulse length. The extraction of ion beams was initiated by the formation of arc plasmas in the LPIS-1, called an arc-beam extraction method. A stable ion beam extraction of the LPIS-1 was achieved with 80聽kV/27聽A and a beam perveance of 1.19聽microperv for a 300聽s pulse length. Beam power deposition along the NBI-1 has been measured using water-flow calorimetry (WFC), and the sum of the deposited power on the ion source and beamline components was about 93%of the drained acceleration power (V_acc鈥_acc). The beam power deposition was compared to the calculated results of the beam transport with re-ionization (BTR) code.