Plasma periphery behavior under OH and under ECRH

Vasin, N.L.; Vershkov, V.A.; Grashin, S.A.; Medvedev, A. A.; Pigarov, A. Yu.; Sushkov, A.; Chankin, A.; Zigenhagen, G.

doi:10.1016/0022-3115(89)90286-9

Cited by 6 publications

(9 citation statements)

References 4 publications

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“…Electron cyclotron resonance heating has been employed on T-10 [36,689] at power levels up to 2 MW and on DITE [721] up to 400 kW. In both machines, the edge temperatures change little from Ohmic levels, but the densities increase.…”

Section: Other Auxiliary Heating Methodsmentioning

confidence: 99%

“…A particularly attractive probe configuration involves mounting the probe within an existing edge structure, such as a limiter, with the probe face flush to the main surface. This arrangement, which has been used successfully on a number of tokamaks (D-III [19,[83][84][85], DITE [86], JET [87], T-10 [36], DIII-D [88]), enjoys a number of advantages:…”

Section: 8)mentioning

confidence: 99%

“…Vasin et al [36] have reported a comparison of Langmuir probe and microwave measurements in the edge of T-10. Eight vertical microwave chords were used and rie(r) was obtained by Abel inversion.…”

Section: Fig 11 Langmuir Probe and Microwave Interferometry Measureme...mentioning

confidence: 99%

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Plasma boundary phenomena in tokamaks

1990

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Section: Other Auxiliary Heating Methodsmentioning

confidence: 99%

Section: 8)mentioning

confidence: 99%

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Plasma boundary phenomena in tokamaks

1990

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“…Other work [8,9] suggested the need for both diffusive and convective components in the transport flux. Experiments employing variation in fuelling rate or fuelling isotope to effect a central change in density or isotope [5][6][7] used simulation with model or neoclassical transport fluxes to obtain local particle transport measurements. Although effective in establishing transport phenomena, these experiments did not identify the processes responsible for transport.…”

Section: Introductionmentioning

confidence: 99%

Global particle confinement in the Texas Experimental Tokamak

et al. 1987

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Particle transport in an ohmically heated tokamak plasma was investigated in the Texas Experimental Tokamak (TEXT). Spectroscopic measurements of the electron source were used with electron density measurements to derive particle confinement times from the continuity equation. Scalings were developed for particle confinement time with electron density, plasma current, toroidal field, and plasma positioning. Simultaneous measurement of electrostatic fluctuations with Langmuir probes may suggest a correlation between edge particle transport in TEXT and electrostatic turbulence. In addition, two major features of transport were isolated. First, transport is poloidally asymmetric at least in the plasma edge. Secondly, in some cases, the particle confinement scalings are closely associated with the scalings for recycling at particular surfaces. Similarities of the TEXT global particle confinement time scalings to those observed in other tokamaks may allow the conclusions of this work to be extended to other devices.

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“…II is important to measure the edge plasma parameters at or inside the tokamak plasma boundary [last closed flux surface (LCFS)] in order to understand such issues as fuel recycling, graphite limiter conditioning, and impurity generation and transport, and to connect the edge measurements to those of bulk plasma parameters. Several studies of this type have been made by edge probe diagnostics on large tokamaks [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

The effect of plasma density on the behavior of the plasma boundary in helium discharges in the Tokamak Fusion Test Reactor

Kilpatrick

Pitcher

Bell

et al. 1990

Journal of Vacuum Science & Technology A: Vacuum, Surfaces,

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Langmuir probe measurements have been made across the plasma boundary in helium discharges of varying central electron densities in the Tokamak Fusion Test Reactor (TFTR). Radial profiles of ion saturation current density, l s , electron density, n e , and electron temperature, T e , were achieved by small displacements of the plasma relative to a stationary probe. Scrape-off lengths outside the plasma boundary decreased somewhat with increasing plasma density. Inside the plasma, l s , n B , and T B rose more steeply for the higher densities than the scrape-off lengths would predict. The floatir.g potential, Vf, decreased sharply inside the boundary as expected, with some density dependence. I s and n e increased with plasma density, while T e decreased a few eV. Measurements of C II emission at the inner wall combined with probe data support a relatively constant edge T e with increasing plasma density and a constant ratio between the fluxes of helium and carbon ions.

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Plasma periphery behavior under OH and under ECRH

Cited by 6 publications

References 4 publications

Plasma boundary phenomena in tokamaks

Plasma boundary phenomena in tokamaks

Global particle confinement in the Texas Experimental Tokamak

The effect of plasma density on the behavior of the plasma boundary in helium discharges in the Tokamak Fusion Test Reactor

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