Kakuyūgō kenkyū

Non-inductive Current Drive in Toroidal System 4. Experiments of Non-inductive Current Drive

4-1 Lower Hybrid and Fast Wave Current Drive Experiments

Takashi Maekawa, Kunizo Ohkubo

1990 Volume 63 Issue 1 Pages 5-38
Published: January 20, 1990
Released on J-STAGE: March 04, 2011

DOIhttps://doi.org/10.1585/jspf1958.63.5

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In Chap. 4.1, we describe the experiments on lower hybrid current drive including fast wave current drive. First, a short review of linear propagation characteristics of the lower hybrid wave is presented. Second, the RF system including the launcher and its RF coupling characteristics with plasma is explained. Third, typical experiments such as flat-top, current start-up and ramp-up discharges, OH transformer recharging, and 'fourth, fast wave experiments, are described. Fifth, present status and prospects of the lower hybrid current drive are discussed in light of application to first-generation D-T tokamak reactors such as ITER. Finally, recent experimental efforts are summarized briefly.

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4. Experiments of Non-inductive Current Drive

4-2 Electron Cyclotron Current Drive

Yasushi Terumichi

1990 Volume 63 Issue 1 Pages 39-42
Published: January 20, 1990
Released on J-STAGE: March 04, 2011

DOIhttps://doi.org/10.1585/jspf1958.63.39

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This paper surveys the recent electron cyclotron current drive (ECCD) experiments on tokamaks. The efficiency of ECCD is briefly discussed.

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Monte Carlo Calculation of Secondary Electron Emission from Carbon-Surface by Obliquely Incident Particles

Kaoru Ohya, Jun Kawata, Ichiro Mori

1990 Volume 63 Issue 1 Pages 43-54
Published: January 20, 1990
Released on J-STAGE: March 04, 2011

DOIhttps://doi.org/10.1585/jspf1958.63.43

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Incidence angle dependences of secondary electron emission from a carbon surface by low energy electron and hydrogen atom are calculated using Monte Carlo simulations on the kinetic emission model. The calculation shows very small increase or rather decrease of the secondary electron yield with oblique incidence. It is explained in terms of not only multiple elastic collisions of incident particles with the carbon atoms but also small penetration depth of the particles comparable with the escape depth of secondary electrons. In addition, the two types of secondary electron emission are distinguished by using the secondary electron yield statistics; one is the emission due to trapped particles in the carbon, and the other is that due to backscattered particles. The high-yield component of the statistics on oblique incidence is more suppressed than those on normal incidence.

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Ultra Fast Gating of Proximity Focused X-ray Image Intensifier

Takeaki Enoto, Kuniyoshi Ishii, Tatsuhiko Yamanaka

1990 Volume 63 Issue 1 Pages 55-61
Published: January 20, 1990
Released on J-STAGE: March 04, 2011

DOIhttps://doi.org/10.1585/jspf1958.63.55

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This paper presents the design of an ultra high speed framing X-ray camera using the proximity focused type micro channel plate (MCP) intensifier with additional control electrode. As the photocathodes for ultra-fast low energy X-ray detectors, we use Au or Csl transmission photocathode mounted on MCP. By utilizing another plate of this MCP, as an additional external transparent electrode, gating time of 100 psec is available. The fundamental experiment of ultra fast gating of this X-ray framing camera at photon energy from 1 to 10 keV is accomplished.

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