Development of Negative-Ion Based NBI System for JT-60

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

doi:10.1080/18811248.1998.9733940

Cited by 39 publications

(7 citation statements)

References 10 publications

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“…The maximum beam injection power of 16 MW uses three injectors with six ion sources [1], which is the same as the design power of one NBI for the International Thermonuclear Experimental Reactor (ITER) [2]. Production of H − ions and their dynamics in the extraction region near the surface of the plasma grid (PG) are important subjects in H − or D − ion sources for high power and stable operation of the present NBI [3,4] and development of future NBI for ITER [2,5].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Optical Emission Spectroscopy and Cavity Ring-Down Spectroscopy in Large-Scaled Negative-Ion Source

Ikeda¹,

Nakano²,

Tsumori

et al. 2011

AIP Conference Proceedings

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Fluorine negative ion density measurement in a dual frequency capacitive plasma etch reactor by cavity ringdown spectroscopy Abstract. Optical emission spectroscopy (OES) and cavity ring-down spectroscopy (CRDS) systems are installed in a 1/3-scaled negative hydrogen-ion source at the National Institute for Fusion Science testbed to investigate the dynamics of H − ions in the extraction region near the plasma grid. The signal form of the H − ion density rapidly drops after beam extraction on applying a low-bias voltage. A similar signal drop appears in the intensity of the hydrogen Balmer-line emission measured by OES and is caused by decreasing atomic hydrogen produced by mutual neutralization effects between H − and H + . Shot trend of the beam currents are similar to the H − density and Hα/Hβ in the extraction region, which increases twice as large immediately after Cs seeding. We observe a linear correlation between the H − density and the inclination of Hα/Hβ which allows for experimentally benchmarking the OES measurement with that of CRDS. Thus, this approach is used for estimating the H − density by OES in negative-ion sources for high-energy neutral beam injector.

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Section: Introductionmentioning

confidence: 99%

Comparison of Optical Emission Spectroscopy and Cavity Ring-Down Spectroscopy in Large-Scaled Negative-Ion Source

Ikeda¹,

Nakano²,

Tsumori

et al. 2011

AIP Conference Proceedings

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“…In the JT-60 negative ion source, high current negative ion beams of >20 A have already been produced through a large extraction area of 45 cm × 120 cm [1,2]. However, the beam pulse length at high current operation is limited to <1 s by high power loadings on acceleration grids and beamline components.…”

Section: Introductionmentioning

confidence: 99%

The origin of beam non-uniformity in a large Cs-seeded negative ion source

et al. 2006

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Origin of the longitudinal beam non-uniformity, that is one of the key issues in large Cs-seeded negative ion sources for fusion application, was experimentally investigated in the JAERI 10 A negative ion source. After a sufficient caesium of ~0.3 g was seeded in the negative ion source to enhance the negative ion production, the longitudinal distribution of the beam intensity was measured. The distribution of the beam intensity was non-uniform,

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“…There are two possibilities: to create positive ions, which is the simpler approach commonly used in many experiments; in alternative, negative ions can be created, with a process which is more complex but allows operation at much higher voltages and, therefore, with much more energy associated with the particles. This second approach has been used in the JT-60 experiment [7] and it is for the time being proposed for ITER-FEAT [3].…”

Section: Neutral Beam Injectors (Nbi) Systemmentioning

confidence: 99%

The Structure of the Power Supplies for Iter-Feat Additional Heating and Current Drive Systems*

Maschio

2003

Plasma Devices and Operations

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Different systems are foreseen for the plasma additional heating and current drive of ITER-FEAT, to provide preionization, assisted current startup, bulk central heating and on-and off-axis current drive. Three different systems of radio frequency (RF) heating (ion cyclotron (IC), electron cyclotron (EC) and lower hybrid (LH)) and a couple of neutral beam injectors (NBI) were designed. The RF generators employ a number of different types of high power vacuum tubes (tetrode (IC), gyrotron (EC) and klystron (LH)) while the neutral injectors consist of coordinated ion production, acceleration and neutralization systems. All these equipments require dedicated dc power supplies PSs; their description and the discussion of their characteristics is done in the paper.

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Development of Negative-Ion Based NBI System for JT-60

Cited by 39 publications

References 10 publications

Comparison of Optical Emission Spectroscopy and Cavity Ring-Down Spectroscopy in Large-Scaled Negative-Ion Source

Comparison of Optical Emission Spectroscopy and Cavity Ring-Down Spectroscopy in Large-Scaled Negative-Ion Source

The origin of beam non-uniformity in a large Cs-seeded negative ion source

The Structure of the Power Supplies for Iter-Feat Additional Heating and Current Drive Systems*

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