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Long-pulse production of the negative ion beams for JT-60SA.

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Title: Long-pulse production of the negative ion beams for JT-60SA.
Authors: Kojima, A.1 kojima.atsushi@jaea.go.jp, Hanada, M.1, Yoshida, M.1, Inoue, T.1, Watanabe, K.1, Taniguchi, M.1, Kashiwagi, M.1, Umeda, N.1, Tobari, H.1, Grisham, L.R.2
Source: Fusion Engineering & Design. Oct2013, Vol. 88 Issue 6-8, p918-921. 4p.
Subjects: Ion beams, Plasma generators, Ion sources, Plasma gases, Surface temperature, Nuclear reactor cooling
Abstract: Toward long-pulse productions of 22A negative ion beams for 100s in JT-60SA, the plasma generator of the negative ion source has been developed to achieve stable long-pulse generations of spatially uniform negative ions. To realize the long pulse production of the negative ions, an actively cooled plasma grid (PG) has been designed to keep a surface temperature of 250–300°C optimized for high negative ion production. The designed active cooling system has a potential to control the surface temperature of the PG to 250°C with a time constant of 10s by flowing the fluorinated fluid having the high boiling temperature of 270°C. Since the time constant is sufficiently shorter than that of the degradation of the negative ion production, the active cooling system is applicable to the long-pulse operation of the large-current negative ion source, such as JT-60SA and ITER ion sources. As for the high current beam production, spatial uniformity of the negative ion productions in the plasma generator is improved. The calculation results of the magnetically confined electron orbits emitted from filaments showed that longitudinal deviations of the primary electron distributions has been reduced from 27% to 6% by the application of the symmetric magnet arrangements, so called the tent-shaped filter. This reduction of the deviation could reduce the grid heat load, leading to the long pulse production of the negative ion beams. [ABSTRACT FROM AUTHOR]
Copyright of Fusion Engineering & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 90524274
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Long-pulse production of the negative ion beams for JT-60SA.
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  Data: <searchLink fieldCode="AR" term="%22Kojima%2C+A%2E%22">Kojima, A.</searchLink><relatesTo>1</relatesTo><i> kojima.atsushi@jaea.go.jp</i><br /><searchLink fieldCode="AR" term="%22Hanada%2C+M%2E%22">Hanada, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yoshida%2C+M%2E%22">Yoshida, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Inoue%2C+T%2E%22">Inoue, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Watanabe%2C+K%2E%22">Watanabe, K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Taniguchi%2C+M%2E%22">Taniguchi, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kashiwagi%2C+M%2E%22">Kashiwagi, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Umeda%2C+N%2E%22">Umeda, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tobari%2C+H%2E%22">Tobari, H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Grisham%2C+L%2ER%2E%22">Grisham, L.R.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Fusion+Engineering+%26+Design%22">Fusion Engineering & Design</searchLink>. Oct2013, Vol. 88 Issue 6-8, p918-921. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Ion+beams%22">Ion beams</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+generators%22">Plasma generators</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+sources%22">Ion sources</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+gases%22">Plasma gases</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+temperature%22">Surface temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+reactor+cooling%22">Nuclear reactor cooling</searchLink>
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  Data: Toward long-pulse productions of 22A negative ion beams for 100s in JT-60SA, the plasma generator of the negative ion source has been developed to achieve stable long-pulse generations of spatially uniform negative ions. To realize the long pulse production of the negative ions, an actively cooled plasma grid (PG) has been designed to keep a surface temperature of 250–300°C optimized for high negative ion production. The designed active cooling system has a potential to control the surface temperature of the PG to 250°C with a time constant of 10s by flowing the fluorinated fluid having the high boiling temperature of 270°C. Since the time constant is sufficiently shorter than that of the degradation of the negative ion production, the active cooling system is applicable to the long-pulse operation of the large-current negative ion source, such as JT-60SA and ITER ion sources. As for the high current beam production, spatial uniformity of the negative ion productions in the plasma generator is improved. The calculation results of the magnetically confined electron orbits emitted from filaments showed that longitudinal deviations of the primary electron distributions has been reduced from 27% to 6% by the application of the symmetric magnet arrangements, so called the tent-shaped filter. This reduction of the deviation could reduce the grid heat load, leading to the long pulse production of the negative ion beams. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Fusion Engineering & Design is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.fusengdes.2013.01.032
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        Text: English
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      – SubjectFull: Plasma generators
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      – SubjectFull: Nuclear reactor cooling
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              Text: Oct2013
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