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Title: Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited)

Abstract

Developments of the large negative ion source have been progressed in the high-energy, high-power, and long-pulse neutral beam injector for JT-60 Super Advanced. Countermeasures have been studied and tested for critical issues of grid heat load and voltage holding capability. As for the heat load of the acceleration grids, direct interception of D{sup -} ions was reduced by adjusting the beamlet steering. As a result, the heat load was reduced below an allowable level for long-pulse injections. As for the voltage holding capability, local electric field was mitigated by tuning gap lengths between large-area acceleration grids in the accelerator. As a result, the voltage holding capability was improved up to the rated value of 500 kV. To investigate the voltage holding capability during beam acceleration, the beam acceleration test is ongoing with new extended gap.

Authors:
; ; ; ; ; ; ; ;  [1];  [2];
  1. Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22053867
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 81; Journal Issue: 2; Conference: ICIS 2009: 13. international conference on ion sources, Gatlinburg, TN (United States), 20-25 Sep 2009; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATORS; ANIONS; BEAM INJECTION; DEUTERIUM IONS; ELECTRIC FIELDS; ELECTRIC POTENTIAL; HEATING LOAD; JT-60 TOKAMAK; JT-60U TOKAMAK; TUNING

Citation Formats

Kojima, A., Hanada, M., Tanaka, Y., Inoue, T., Watanabe, K., Taniguchi, M., Kashiwagi, M., Umeda, N., Tobari, H., Grisham, L. R., and Collaboration: JT-60 NBI Group. Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited). United States: N. p., 2010. Web. doi:10.1063/1.3279398.
Kojima, A., Hanada, M., Tanaka, Y., Inoue, T., Watanabe, K., Taniguchi, M., Kashiwagi, M., Umeda, N., Tobari, H., Grisham, L. R., & Collaboration: JT-60 NBI Group. Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited). United States. doi:10.1063/1.3279398.
Kojima, A., Hanada, M., Tanaka, Y., Inoue, T., Watanabe, K., Taniguchi, M., Kashiwagi, M., Umeda, N., Tobari, H., Grisham, L. R., and Collaboration: JT-60 NBI Group. Mon . "Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited)". United States. doi:10.1063/1.3279398.
@article{osti_22053867,
title = {Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited)},
author = {Kojima, A. and Hanada, M. and Tanaka, Y. and Inoue, T. and Watanabe, K. and Taniguchi, M. and Kashiwagi, M. and Umeda, N. and Tobari, H. and Grisham, L. R. and Collaboration: JT-60 NBI Group},
abstractNote = {Developments of the large negative ion source have been progressed in the high-energy, high-power, and long-pulse neutral beam injector for JT-60 Super Advanced. Countermeasures have been studied and tested for critical issues of grid heat load and voltage holding capability. As for the heat load of the acceleration grids, direct interception of D{sup -} ions was reduced by adjusting the beamlet steering. As a result, the heat load was reduced below an allowable level for long-pulse injections. As for the voltage holding capability, local electric field was mitigated by tuning gap lengths between large-area acceleration grids in the accelerator. As a result, the voltage holding capability was improved up to the rated value of 500 kV. To investigate the voltage holding capability during beam acceleration, the beam acceleration test is ongoing with new extended gap.},
doi = {10.1063/1.3279398},
journal = {Review of Scientific Instruments},
number = 2,
volume = 81,
place = {United States},
year = {Mon Feb 15 00:00:00 EST 2010},
month = {Mon Feb 15 00:00:00 EST 2010}
}