Structure of the plasma and energy balance near the limiter in the L-2 stellarator

Berezhetskiǐ, M. S.; Budaev, V.P.; Ivanov, R.S.; Rakowez, A.A.; Попов, С. Н.; Khol'nov, Yu.V.; Andryukhina, E.D.; Dyabilin, K. S.; Fedyanin, O.I.

doi:10.1016/0022-3115(89)90371-1

“…The probe data indicate the existence of a sharp plasma boundary, where the electron density and temperature profiles fall steeply down. The position of this boundary r ∼ 11.6 ± 0.2 cm is close to the separatrix and does not depend on variations in the plasma parameters [4].…”

mentioning

confidence: 79%

Edge transport barrier modification in the L-2M stellarator depending on the heating power and plasma parameters

Voronov

¹

,

Воронова

²

,

Akulina

³

et al. 2006

Plasma Phys. Control. Fusion

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Boronization of the vacuum chamber of the L-2M stellarator has resulted in modification of the electron temperature profile. In particular, a welldefined jump in the electron temperature to T e ∼ 100 eV in a narrow region r/r ∼ 0.05 is observed in the temperature profile at the plasma edge. In the present paper, the value and shape of the jump in T e are studied at different values of plasma parameters and ECR heating power. A jump in T e is absent at a power of P ∼ 100 kW, whereas at P ∼ 200 kW the electron temperature drops from 150 eV to zero within r ∼ 0.5 cm. The value of threshold power for the formation of a jump in T e at n e ∼ 1.7 × 10 19 m −3 lies within the range P ∼100-160 kW. In terms of power per particle this power threshold is P /V /N e ∼ 0.2-0.3 Mw/m 3 /10 19 m −3 , the value of which coincides with threshold power for ETB formation found recently in the CHS stellarator. When the helical-field strength is 25% or 50% below its standard value, a jump in T e at the plasma edge in L-2M is absent.

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“…The position of this boundary r ∼ 11.6 ± 0.2 cm is close to the separatrix and does not depend on variations in the plasma parameters [4].…”

mentioning

confidence: 79%

Theoretical Study of Exposure Latitude of Chemically Amplified Resists Used for Extreme Ultraviolet Lithography

Kozawa¹,

Tagawa²

2011

Jpn. J. Appl. Phys.

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Boronization of the vacuum chamber of the L-2M stellarator has resulted in modification of the electron temperature profile. In particular, a welldefined jump in the electron temperature to T e ∼ 100 eV in a narrow region r/r ∼ 0.05 is observed in the temperature profile at the plasma edge. In the present paper, the value and shape of the jump in T e are studied at different values of plasma parameters and ECR heating power. A jump in T e is absent at a power of P ∼ 100 kW, whereas at P ∼ 200 kW the electron temperature drops from 150 eV to zero within r ∼ 0.5 cm. The value of threshold power for the formation of a jump in T e at n e ∼ 1.7 × 10 19 m −3 lies within the range P ∼100-160 kW. In terms of power per particle this power threshold is P /V /N e ∼ 0.2-0.3 Mw/m 3 /10 19 m −3 , the value of which coincides with threshold power for ETB formation found recently in the CHS stellarator. When the helical-field strength is 25% or 50% below its standard value, a jump in T e at the plasma edge in L-2M is absent.

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“…The antenna surface facing the plasma column followed the shape of the last closed magnetic surface (LCMS), so that the distance from the antenna to the plasma was everywhere equal to 1 cm. Probe measurements showed that, outside the LCMS, the plasma density fell by two orders of magnitude at a distance of 1 cm [8]. Hence, at the antenna location, the plasma density was as low as n e ≈ 2 × 10 15 m -3 .…”

Section: Measurements Of the Load Resistance Of A Poloidal Antenna Anmentioning

confidence: 97%

10.1007/s11452-008-3006-0

2010

CrossRef Listing of Deleted DOIs

0

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The propagation and damping of waves excited by a poloidal antenna in a hydrogen plasma at the ion cyclotron resonance (ICR) frequency were investigated. The longitudinal wavenumber and damping length of waves excited in the ohmically heated plasma of the L-2M stellarator, the dependence of the damping length of fast magnetosonic waves on the magnetic field strength, and the dependence of the antenna load resistance on the plasma density were measured. It is the first time that such complex measurements were performed in experiments on ICR heating of a hydrogen plasma at the fundamental harmonic of the ion gyrofrequency in toroidal magnetic confinement systems.

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Structure of the plasma and energy balance near the limiter in the L-2 stellarator

Cited by 9 publications

References 4 publications

Edge transport barrier modification in the L-2M stellarator depending on the heating power and plasma parameters

Edge transport barrier modification in the L-2M stellarator depending on the heating power and plasma parameters

Theoretical Study of Exposure Latitude of Chemically Amplified Resists Used for Extreme Ultraviolet Lithography

10.1007/s11452-008-3006-0

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