Dynamical properties of Cs plasma produced by Q‐switched laser beams

Yamamuchi, T.; Okuda, Takayoshi; Ishikawa, Naoki

doi:10.1002/eej.4390950103

Cited by 2 publications

(1 citation statement)

References 7 publications

(3 reference statements)

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“…The glass slide is located 6 cm from the outer plasma edge. The velocity of the neutral atoms is deduced from that of the aluminium plasma [9] measured with two Langmuir probes placed in front of the glass slide. Estimated 4 ± 2 X 10 16 atoms, probably including some fraction in the form of clusters [ 10], are directed obliquely to the outer-edge magnetic surface through a shell gap.…”

Section: Figl Cross-sectional View Of Diva Tokamak and Experimental A...mentioning

confidence: 99%

Impurity shielding and sweeping-out by an axisymmetric divertor in DIVA

Nagami¹,

Shimomura²,

Maeda³

et al. 1978

Nucl. Fusion

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A pulse of methane gas and a short burst of aluminium have been injected into DIVA plasma at the point farthest from the divertor. For the same amount of injected impurity, the accumulation of injected impurity in the main plasma is reduced by a factor of 2 to 4 by the action of the divertor. The impurity shielded by the scrape-off plasma is rapidly guided into the burial chamber. The time needed for the poloidal excursion of the injected impurity ions in the scrape-off layer is roughly equal to that of the scrape-off plasma. Sweeping-out of the impurity ions diffusing from the main plasma into the burial chamber is also observed.

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Section: Figl Cross-sectional View Of Diva Tokamak and Experimental A...mentioning

confidence: 99%

Impurity shielding and sweeping-out by an axisymmetric divertor in DIVA

Nagami¹,

Shimomura²,

Maeda³

et al. 1978

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

Metal Impurity Injection into DIVA Plasma with a Q-Switched Laser Beam

Yamauchi¹,

Nagami²,

Sengoku³

1980

Jpn. J. Appl. Phys.

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The impurity blow-off technique is a useful technique for obtaining clear evidence of impurity behaviour in Tokamak plasmas. In this paper, we describe how the blow-off technique is applied to a DIVA plasma and present some experimental results. The metals injected are aluminium and gold. A layer of metal about 0.2 µm thick is adsorbed onto a pyrex glass plate, through which a Q-switched laser beam passes to irradiate the thin film. The film is vaporized by the laser beam and injected into the DIVA plasma with directional velocity. The injection rate is easily and accurately controlled by changing the film thickness and/or the aperture of the laser beam. The total number of aluminium atoms evaporated is 8.0×1016 and their velocity is 5.2×105 cm/s. Thus, the maximum increase in electron density is about 8% and the spectral line signals of Al XI 550 Å are observed with good reproducibility.

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Dynamical properties of Cs plasma produced by Q‐switched laser beams

Cited by 2 publications

References 7 publications

Impurity shielding and sweeping-out by an axisymmetric divertor in DIVA

Impurity shielding and sweeping-out by an axisymmetric divertor in DIVA

Metal Impurity Injection into DIVA Plasma with a Q-Switched Laser Beam

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