Abstract
Some plasma parameters outside the confinement volume near the last closed magnetic surface (LCMS) and in the divertor fluxes were studied by probe and microwave techniques during ICR production and heating of the plasma in the Uragan-3M torsatron (1=3, m=9, R{sub o}=100cm, a-bar{<=}11 cm, l (a-bar){<=}0.29; B{sub o}{<=}20kG, n-bar{sub e}{approx_equal}2x10{sup 12}cm{sup -3}, T{sub i}(0)=200-300 eV, T{sub e}(0){approx_equal}100 eV). When moving around the LCMS, the steepness of the radial density, electron temperature and potential profiles increases with the distance away from the ``rib`` of the LCMS. The quasi-steady radial electric field E{sub r} near the LCMS exceeds 100 V/cm and is directed outwards, opposite to the calculated ambipolar electric field inside the confinement volume. It is shown that the total flow of the diverted plasma in the spacing between two helical windings consists of (i) a weakly mobile non-resonant component which is presumably formed at the periphery due to ionization, and (ii) a component whose value and poloidal location are sensitive to resonance conditions for RF power absorption, this flow being apparently formed by a plasma diffusing through the LCMS and/or generated near the LCMS, where the filed E{sub r} is localized. Based on plasma parameters measurements after the RF pulse
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Citation Formats
Besedin, N T, Chechkin, V V, and Fomin, I P.
Characteristics of ICR-produced peripheral plasma in the URAGAN-3M torsatron.
Ukraine: N. p.,
1991.
Web.
Besedin, N T, Chechkin, V V, & Fomin, I P.
Characteristics of ICR-produced peripheral plasma in the URAGAN-3M torsatron.
Ukraine.
Besedin, N T, Chechkin, V V, and Fomin, I P.
1991.
"Characteristics of ICR-produced peripheral plasma in the URAGAN-3M torsatron."
Ukraine.
@misc{etde_10135778,
title = {Characteristics of ICR-produced peripheral plasma in the URAGAN-3M torsatron}
author = {Besedin, N T, Chechkin, V V, and Fomin, I P}
abstractNote = {Some plasma parameters outside the confinement volume near the last closed magnetic surface (LCMS) and in the divertor fluxes were studied by probe and microwave techniques during ICR production and heating of the plasma in the Uragan-3M torsatron (1=3, m=9, R{sub o}=100cm, a-bar{<=}11 cm, l (a-bar){<=}0.29; B{sub o}{<=}20kG, n-bar{sub e}{approx_equal}2x10{sup 12}cm{sup -3}, T{sub i}(0)=200-300 eV, T{sub e}(0){approx_equal}100 eV). When moving around the LCMS, the steepness of the radial density, electron temperature and potential profiles increases with the distance away from the ``rib`` of the LCMS. The quasi-steady radial electric field E{sub r} near the LCMS exceeds 100 V/cm and is directed outwards, opposite to the calculated ambipolar electric field inside the confinement volume. It is shown that the total flow of the diverted plasma in the spacing between two helical windings consists of (i) a weakly mobile non-resonant component which is presumably formed at the periphery due to ionization, and (ii) a component whose value and poloidal location are sensitive to resonance conditions for RF power absorption, this flow being apparently formed by a plasma diffusing through the LCMS and/or generated near the LCMS, where the filed E{sub r} is localized. Based on plasma parameters measurements after the RF pulse is switched off, a qualitative model of peripheral plasma dynamics after the end of the RF heating is constructed. 23 refs.; 13 figs. (author).}
place = {Ukraine}
year = {1991}
month = {Dec}
}
title = {Characteristics of ICR-produced peripheral plasma in the URAGAN-3M torsatron}
author = {Besedin, N T, Chechkin, V V, and Fomin, I P}
abstractNote = {Some plasma parameters outside the confinement volume near the last closed magnetic surface (LCMS) and in the divertor fluxes were studied by probe and microwave techniques during ICR production and heating of the plasma in the Uragan-3M torsatron (1=3, m=9, R{sub o}=100cm, a-bar{<=}11 cm, l (a-bar){<=}0.29; B{sub o}{<=}20kG, n-bar{sub e}{approx_equal}2x10{sup 12}cm{sup -3}, T{sub i}(0)=200-300 eV, T{sub e}(0){approx_equal}100 eV). When moving around the LCMS, the steepness of the radial density, electron temperature and potential profiles increases with the distance away from the ``rib`` of the LCMS. The quasi-steady radial electric field E{sub r} near the LCMS exceeds 100 V/cm and is directed outwards, opposite to the calculated ambipolar electric field inside the confinement volume. It is shown that the total flow of the diverted plasma in the spacing between two helical windings consists of (i) a weakly mobile non-resonant component which is presumably formed at the periphery due to ionization, and (ii) a component whose value and poloidal location are sensitive to resonance conditions for RF power absorption, this flow being apparently formed by a plasma diffusing through the LCMS and/or generated near the LCMS, where the filed E{sub r} is localized. Based on plasma parameters measurements after the RF pulse is switched off, a qualitative model of peripheral plasma dynamics after the end of the RF heating is constructed. 23 refs.; 13 figs. (author).}
place = {Ukraine}
year = {1991}
month = {Dec}
}