Negative ion beam extraction experiments on the KAERI negative ion source

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• 作者：Seung Ho Jeong ; ^{shjeong2@kaeri.re.kr" class="auth_mail" title="E-mail the corresponding author} ; Tae-Seong Kim ; Min Park ; Doo-Hee Chang ; Bongki Jung ; Sang-Ryul In ; Kwang Won Lee
• 关键词：Negative ion source ; RF ion source ; Magnetic filter ; Electron deflection field ; e/H&minus ; ratio ; Negative NBI
• 刊名：Fusion Engineering and Design
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：109-111
• 期：part_PA
• 页码：186-191
• 全文大小：2319 K

文摘

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d="par0005">The magnetic filter field and the electron deflection magnetic field were designed by using OPERA-3D code.

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d="par0010">The magnetic filter field is produced by a pair of permanent magnets. The electron deflection field is produce by 6 bar-magnets embedded in the extraction grid.

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d="par0015">The negative ion beam current density is about 0.6 mA/cm² at 5 kW RF power, which is proportional to RF power in lower RF power region.

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d="par0020">The required operation pressure of ITER NBI ion source is less than 0.3 Pa, the result showed the maximum current at 0.3 Pa.

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d="par0025">The effect of floating of the plasma bucket was observed. When the plasma bucket is floating, the negative beam and electron current are enhanced, but e/H-ratio also increased.

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