Operation and Development of the 500-keV Negative-Ion-Based Neutral Beam Injection System for JT-60U

Kuriyama, M.; Akino, N.; Ebisawa, N.; Grisham, L.; Honda, Akira; Itoh, Takaò; Kawai, M.; Kazawa, M.; Mogaki, K.; Ohara, Y.; Ohga, T.; Okumura, Y.; Oohara, H.; Umeda, N.; Usui, K.; Watanabe, K.; Yamamoto, Masahiro; Yamamoto, T.

doi:10.13182/fst02-a237

Cited by 47 publications

(10 citation statements)

References 19 publications

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“…In the JT-60 negative ion source, high current negative ion beams of >20 A have been already produced through a large extraction area of 45 cm × 120 cm [1,2].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on spatial uniformity of H− ion beam in a large negative ion source

Hanada

Seki

Takado

et al. 2005

Fusion Engineering and Design

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“…In the JT-60 negative ion source, high current negative ion beams of >20 A have been already produced through a large extraction area of 45 cm × 120 cm [1,2].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on spatial uniformity of H− ion beam in a large negative ion source

Hanada

Seki

Takado

et al. 2005

Fusion Engineering and Design

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“…In the international thermonuclear experimental reactor ͑ITER͒ and JT-60U, highe current D − ion beams of 40 and 22 A are designed to be produced through more than 1000 apertures. 1,2 The pulse length of the negative ion beams required for fusion application is more than 100 s. One of the critical issues for producing high current negative ion beams with long pulse duration is to suppress the power loading of the acceleration grids due to the direct interception of negative ions. When operating at optimum perveance, the direct interception of the negative ions is mainly caused by deflection of the outer beamlets due to unbalanced space charge forces from the inner beamlets.…”

Section: Introductionmentioning

confidence: 99%

Beamlet deflection due to beamlet-beamlet interaction in a large-area multiaperture negative ion source for JT-60U

Kamada

Hanada

Ikeda

et al. 2008

Review of Scientific Instruments

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The JT-60U negative ion source has been designed to produce high current beams of 22 A through grids of 1080 apertures (five segments with nine rows of 24 apertures). One of the key issues is to steer such a high current beam through the multiaperture grids in order to focus the overall beam envelope because the beamlet-beamlet interaction may deflect the outer beamlets outward due to unbalanced space charge repulsion. To clarify the beam deflection in the JT-60U negative ion source, the beamlet trajectory in a multiaperture ion source was calculated by a three-dimensional simulation code. The measured angles of the outmost beamlets were in agreement with the calculated results where space charge of the beamlets was taken into account. It is noticed that the deflection of the outermost beamlet due to the beamlet-beamlet interaction is saturated at 5.2 mrad outward for beamlets more than ten.

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“…The JT-60U negative ion source has the plasma grid ͑PG͒ magnetic filter to produce the uniform transverse magnetic field near the plasma grid, which suppresses the electrons traveling from the negative-ion generator into the extractor. 1 This magnetic field also deflects beams downside in the accelerator. In this article, the effect of the PG magnetic field on the negative-ion and electron-beam trajectories is presented.…”

Section: Introductionmentioning

confidence: 99%

“…The detail of the ion source is described in Ref. 1. The negative-ion source consists of a negative-ion generator, an extractor, and an accelerator.…”

Section: Introductionmentioning

confidence: 99%

Beam deflection by plasma grid filter current in the negative-ion source for JT-60U neutral beam injection system

Umeda

Ikeda

Hanada

et al. 2006

Review of Scientific Instruments

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Articles you may be interested inAchievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited)a) Rev. Sci. Instrum. 81, 02B112 (2010); 10.1063/1.3279398 Long pulse production of high current D − ion beams in the JT-60 negative ion sourcea) Rev. Sci. Instrum. 79, 02A519 (2008); 10.1063/1.2821508 Development of a rf negative-ion source for ITER neutral beam injection Rev. Sci. Instrum. 77, 03A519 (2006); 10.1063/1.2166246 Alfvén eigenmodes in reversed shear plasmas in JT-60U negative-ion-based neutral beam injection discharges Phys. Plasmas 12, 082509 (2005); 10.1063/1.1938973 Power flow in the negative-ion based neutral beam injection for JT-60 Rev. Sci. Instrum. 71, 751 (2000)

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Operation and Development of the 500-keV Negative-Ion-Based Neutral Beam Injection System for JT-60U

Cited by 47 publications

References 19 publications

Experimental study on spatial uniformity of H− ion beam in a large negative ion source

Experimental study on spatial uniformity of H− ion beam in a large negative ion source

Beamlet deflection due to beamlet-beamlet interaction in a large-area multiaperture negative ion source for JT-60U

Beam deflection by plasma grid filter current in the negative-ion source for JT-60U neutral beam injection system

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