Axi-symmetrization of radiation pattern and two wave heating of fundamental ECRH in GAMMA 10

Saito, T.; Tatematsu, Y.; Kiwamoto, Y.; Abe, H.; Ishikawa, Masatoshi; Kajiwara, K.; Koyama, Hiroki; Suzuki, Atsushi; Cho, T; Ichimura, M.; Ishii, K.; Itakura, A.; Mase, A.; Oyama, N.; Yatsu, K.

doi:10.1016/s0920-3796(00)00503-2

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…After the modification of the antenna system, the measured potential profile became almost circular. 3,4) Moreover, a noticeable increment in the central cell line density was obtained during plug-ECRH operation. 3,5) Thus, in experiments, it has been found that the beam shape on the resonance surface is closely related to the radial profile of the plasma-confining potential and strongly affects the performance of plasma confinement.…”

Section: Introductionmentioning

confidence: 94%

“…The transmission system of plug-ECRH was then modified to make the beam shape circular on the resonance surface. 3) The modification was achieved by installing a mirror midway between the beam transmission. After the modification of the antenna system, the measured potential profile became almost circular.…”

Section: Introductionmentioning

confidence: 99%

“…3,5) Thus, in experiments, it has been found that the beam shape on the resonance surface is closely related to the radial profile of the plasma-confining potential and strongly affects the performance of plasma confinement. 3,5) Therefore, it is required that the beam shape is axisymmetric there.…”

Section: Introductionmentioning

confidence: 99%

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Design of Reflecting Mirrors for Electron Cyclotron Wave Launching System in GAMMA 10

Tatematsu¹,

Nozaki²,

Saito³

et al. 2005

Jpn. J. Appl. Phys.

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A -conjugated compound with two thioacetate end groups was synthesized using a recently developed method. A selfassembled monolayer (SAM) of corresponding dithiol was prepared by dipping a Au(111) surface for 1 min in a 2 mM dithiol toluene solution formed 30 min after the addition of a drop of 30% NH 4 OH in water to the dithioacetate toluene solution. We investigated electronic conduction through isolated single molecules of the -conjugated compound by statistical analysis of molecular junctions repeatedly formed between a gold tip and the SAM on Au(111) using scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV). The single-molecular conductivity of the -conjugated compound is described as G m ¼ T contact with tip Á T -system Á T contact with substrate Á G 0 according to the Landauer equation. Here, Ts are transmission functions and G 0 is the quantum conductance, i.e., 2e 2 =h. Because of observed high values of G m for the -conjugated compound, we could readily analyze the effect of molecule-electrode contacts on T contact with tip Á T contact with substrate . Namely, we successfully observed the dependence of T contact with tip Á T contact with substrate on binding sites of -S À on a Au(111) surface, i.e., the bridge (or the hollow) and the top sites.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Design of Reflecting Mirrors for Electron Cyclotron Wave Launching System in GAMMA 10

Tatematsu¹,

Nozaki²,

Saito³

et al. 2005

Jpn. J. Appl. Phys.

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“…With the modification, the radiation pattern becomes axisymmetric and the potential profile also becomes axisymmetric. 9 The strength of the magnetic field at the midplane of the central cell and the anchor cell is typically 0.4 and 0.6 T, respectively. The stainless steel limiter with a radius of 0.18 m is located near the midplane.…”

Section: A Gamma 10 Tandem Mirrormentioning

confidence: 99%

High-density plasma production with potential confinement in the GAMMA 10 tandem mirror

et al. 2001

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539͔ by axisymmetrization of heating systems for the plasma production, heating, and potential formation. A significant increase of the density and diamagnetism by the potential confinement was observed. In the previous experiment, it was difficult to increase the central cell density higher than 2.7ϫ10 18 m Ϫ3. One of the possible mechanisms is the density clamping due to the eigenmode formation of the ion-cyclotron-range of frequency ͑ICRF͒ waves in the axial direction. With high harmonic ICRF waves ͑RF3͒, the experiments to overcome this problem have been performed. In preliminary experiments with RF3 and NBI the maximum density of 4ϫ10 18 m Ϫ3 was attained.

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“…Figure 1 illustrates the axial profile of the magnetic field strength in the end mirror cell where the plug potential is created. For a standard experiment, the magnetic field strength at the throats of both mirrors is 3.0 T and that at the mid-plane is 0.5 T. Fundamental ECRH is applied at the plug position where the magnetic field strength is 1.0 T. The microwave power delivered from a 28 GHz gyrotron with a maximum power of 200 kW is radiated from a Vlasov-Nakajima antenna, reflected off a cylindrical mirror, and injected to the resonance surface in the x-mode [31].…”

Section: Introductionmentioning

confidence: 99%

Potential Linkage between the Plug Region and an End Plate in GAMMA 10.

Saito

Tatematsu

Katanuma

et al. 2002

J. Plasma Fusion Res.

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In GAMMA 10, the plasma potential at the plug region, which is generated by fundamental ECRH, is linked to the end plate potential. There are two factors in this linkage. One is the field-aligned flow of warm electrons driven into the loss cone by ECRH. The other is a finite current through the end plate. This current is connected to an ion current, which is detected on annular electrodes in the end mirror cell where the plug potential is formed. An experimental attempt to externally control this current was performed by varying the resistance connecting the end plate to the vacuum vessel, and a picture of current circulation was obtained. In this circuit, ECRH generates an electromotive force by driving the axial flow of electrons. This electromotive force is divided into the positive plug potential and the negative end plate potential, respectively as measured from the vacuum vessel to meet the condition of a closed circuit.

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Axi-symmetrization of radiation pattern and two wave heating of fundamental ECRH in GAMMA 10

Cited by 12 publications

References 13 publications

Design of Reflecting Mirrors for Electron Cyclotron Wave Launching System in GAMMA 10

Design of Reflecting Mirrors for Electron Cyclotron Wave Launching System in GAMMA 10

High-density plasma production with potential confinement in the GAMMA 10 tandem mirror

Potential Linkage between the Plug Region and an End Plate in GAMMA 10.

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