HCN laser scattering on the JIPP T-IIU tokamak

Kawahta, K.; Tetsuka, T.; Fujita, J.; Nagatsu, Masaaki; Ohnishi, Haruyuki; Okajima, S.; Iwasaki, Takeo

doi:10.1007/bf01013418

Cited by 14 publications

(1 citation statement)

References 8 publications

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“…Other measurements related with the electric field show consistent results. The dispersion relations of drift wave type density fluctuations have been obtained with HCN laser scattering [20], and the electric field is estimated to be -90 V/cm at r = 16 cm (corresponding to R = 107 cm), assuming that the measured phase velocity is due to a superposition of the electron diamagnetic drift velocity on Doppler shifts. The electric field near the plasma centre (r = 3 cm, R = 94 cm) is estimated by using m/n = 1/1 MHD oscillations and is found to be -20 V/cm (NBI) and -40 V/cm (NBI+ICRF).…”

Section: Radial Electric Fieldmentioning

confidence: 99%

Observation of toroidal plasma rotation driven by the electric field induced by loss of ions

et al. 1991

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Toroidal plasma rotation driven not by the momentum input but by the electric field induced by loss of ions has been observed for plasmas heated by perpendicular neutral beam injection. The rotation is found to increase in the direction opposite to the plasma current when the plasma ions are heated by ion cyclotron resonance frequency waves. The rotation driven by the electric field is quantitatively consistent with that inferred from the ambipolarity of particle fluxes.

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Section: Radial Electric Fieldmentioning

confidence: 99%

Observation of toroidal plasma rotation driven by the electric field induced by loss of ions

et al. 1991

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A transmission line for plasma scattering measurements with a submillimeter wave gyrotron

Ogawa¹,

Idehara

Ibe

et al. 1994

Int J Infrared Milli Waves

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Stabilization and modulation of the output power of submillimeter wave gyrotron

Ogawa

Idehara²,

et al. 2001

Fusion Engineering and Design

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High frequency, medium power gyrotrons (Gyrotron FU series) have been developed at the Fukui University as radiation sources convering a broad frequency band from millimeter to submillimeter wave region. We have performed cw operation of the Gyrotron FU IV. However, the output power was not stable (approximately several tens %) due to the fluctuation of the cathode potential (40 V). The output power was stabilized within several percent by controlling the anode potential. Such a technique was also used for amplitude modulation of the gyrotron output. Improved stabilization of output power and effective modulation will be achieved by stabilizing the cathode potential

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HCN laser scattering on the JIPP T-IIU tokamak

Cited by 14 publications

References 8 publications

Observation of toroidal plasma rotation driven by the electric field induced by loss of ions

Observation of toroidal plasma rotation driven by the electric field induced by loss of ions

A transmission line for plasma scattering measurements with a submillimeter wave gyrotron

Stabilization and modulation of the output power of submillimeter wave gyrotron

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