The JT-60 project and its present status

Yoshikawa, M.

doi:10.1088/0029-5515/25/9/014

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…JT-60 is a circular tokamak which can be operated in an outer single-null divertor configuration or in a limiter configuration. The major and minor plasma radii are about 3.1 m and 0.9 m [6]. The ICRF launcher in JT-60 consists of a single-layer Faraday shield, a 2 X 2 phased loop antenna array and a metal casing [7].…”

Section: Resultsmentioning

confidence: 99%

Coupling properties of the JT-60 ICRF antenna during H-mode discharges

Saigusa¹,

Kimura²,

Fujii³

et al. 1989

Nucl. Fusion

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An increase of the coupling resistance of an ICRF 2 × 2 phased loop antenna array after H-mode transition was first observed in JT-60. The coupling resistance of the ICRF antenna decreases after H-mode transition in the (0,0) antenna phasing (toroidal phase difference), but it increases in the (π,0) antenna phasing (poloidal phase difference). This different behaviour can be explained by antenna-plasma coupling theory, taking the antenna phasings and the electron density profiles into account. The coupling resistance can be kept constant after H-mode transition by adjusting the toroidal wave number spectra of the antenna currents.

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Section: Resultsmentioning

confidence: 99%

Coupling properties of the JT-60 ICRF antenna during H-mode discharges

Saigusa¹,

Kimura²,

Fujii³

et al. 1989

Nucl. Fusion

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“…The research objective of JT-60 is to achieve and study reactor relevant plasmas (n e T^ = 2-6 X 10 19 m" 3 s and Tj = 5-10 keV) [ 1 ]. To realize these plasmas, neutral beam power of up to 20 MW has been injected into 2 MA divertor discharges [2][3][4][5] in JT-60.…”

Section: Introductionmentioning

confidence: 99%

Incremental energy confinement time during H⁰beam heating in JT-60

Kikuchi¹,

Hirayama²,

Shimizu³

et al. 1987

Nucl. Fusion

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Characteristics are presented of the energy confinement time resulting from neutral hydrogen beam heating of JT-60 tokamak plasmas with a plasma current, Ip, of 1-2 MA, a line averaged electron density, n e , of 1.5-7 X 10 19 m~3 and an absorbed beam power, P a b S , up to 20 MW. The plasma energy content follows an offset linear relation to the absorbed power. The incremental energy confinement time for thermal components, rg c , is almost independent of I p and n e at 60 ms, while the incremental energy confinement time for the total plasma energy, TJJ<£, decreases with plasma density. The value of rg c in JT-60 coincides with the prediction of the Shimomura-Odajima scaling of L-mode discharges.

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“…The net measured items included inductance at I MHz, a lower and upper resonance frequency and respective loads, and the lower resonant frequency's magnetic probe voltage over the antenna input voltage. From this we infer /; ea d. /"lead, r, L, C, and the magnetic field at the resistive sheet per unit current (B/I) 2 . Figure 6 shows that the inferred antenna parameters are in good agreement with the actual measurements across the 20-MHz spectrum.…”

Section: The Test Setupmentioning

confidence: 99%

Material and Electromagnetic Properties of Faraday Shields for Ion Cyclotron Heating Antennas

et al. 1985

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The Faraday shields for ion cyclotron antennas must transmit magnetic waves and adsorb little rf power. To investigate these properties, we have constructed 27 Faraday shields in many configurations, including chevrons, tubes, straps, concentric rings, various layered shields, conventionally leafed straps, and replicas of the Faraday shields for ASDEX, the Joint European Torus (JET), TEXTOR. and Alcator-C. We have measured the magnetic flux and observed loading at various operating resistances by using dielectric sheets or magnetic-coupled loads. Each Faraday shield effects a net change in the characteristic inductance of the antenna, resulting in a reduction of wave coupling. However, the load experienced by the antenna is not always reduced because the Faraday shield itself acts as a load. We differentiate between these effects experimentally. The net result of the study is that che Faraday shields now in use cost up to a factor of 50% of coupling. This, of course, reduces the power handling capability by 50% as well. However, configurations exist that are easily cooled and result in a reduction of less than 5% in loading. a. g g g 3 =3 "3

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The JT-60 project and its present status

Abstract: A summary is given of the objectives, design features, construction and future programme of the JT-60 project. Experimental results obtained during the first period of operation of JT-60 are briefly described.

Cited by 9 publications

References 3 publications

Coupling properties of the JT-60 ICRF antenna during H-mode discharges

Coupling properties of the JT-60 ICRF antenna during H-mode discharges

Incremental energy confinement time during H⁰beam heating in JT-60

Material and Electromagnetic Properties of Faraday Shields for Ion Cyclotron Heating Antennas

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The JT-60 project and its present status

Abstract: A summary is given of the objectives, design features, construction and future programme of the JT-60 project. Experimental results obtained during the first period of operation of JT-60 are briefly described.

Cited by 9 publications

References 3 publications

Coupling properties of the JT-60 ICRF antenna during H-mode discharges

Coupling properties of the JT-60 ICRF antenna during H-mode discharges

Incremental energy confinement time during H0beam heating in JT-60

Material and Electromagnetic Properties of Faraday Shields for Ion Cyclotron Heating Antennas

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Incremental energy confinement time during H⁰beam heating in JT-60