Practical formula for Mach number probe diagnostics in weakly magnetized plasmas

Shikama, T.; Kado, S.; Okamoto, Atsushi; Kajita, Shin; Tanaka, Satoru

doi:10.1063/1.1872895

Cited by 29 publications

(31 citation statements)

References 17 publications

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“…By rotating the Mach probe, R M is measured as a function of the angle h between the line connecting opposing probes and B. Following recent work by Shikama et al [14], we then fit the data with a function of the form…”

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

Examination of the velocity time-delay-estimation technique

Holland

Tynan

et al. 2007

Journal of Nuclear Materials

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Section: Experimental Set-up and Resultsmentioning

confidence: 99%

Examination of the velocity time-delay-estimation technique

Holland

Tynan

et al. 2007

Journal of Nuclear Materials

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“…Flows are measured using a Gundestrup (Mach) probe with six faces [25]. The flow measurements are corrected for the finite acceptance angle of the probe faces, which are smaller than the ion gyroradius [26].…”

Section: Methodsmentioning

confidence: 99%

Modifications of turbulence and turbulent transport associated with a bias-induced confinement transition in the Large Plasma Device

Carter

Maggs

2009

Physics of Plasmas

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Azimuthal flow is driven in the edge of the Large Plasma Device (LAPD) [W. Gekelman, et. al, Rev. Sci. Instr. 62, 2875(1991] through biasing a section of the vacuum vessel relative to the plasma source cathode. As the applied bias exceeds a threshold, a transition in radial particle confinement is observed, evidenced by a dramatic steepening in the density profile, similar to the Lto H-mode transition in toroidal confinement devices. The threshold behavior and dynamic behavior of radial transport is related to flow penetration and the degree of spatial overlap between the flow shear and density gradient profiles. An investigation of the changes in turbulence and turbulent particle transport associated with the confinement transition is presented. Two-dimensional crosscorrelation measurements show that the spatial coherence of edge turbulence in LAPD changes significantly with biasing. The azimuthal correlation in the turbulence increases dramatically, while the radial correlation length is little altered. Turbulent amplitude is reduced at the transition, particularly in electric field fluctuations, but the dominant change observed is in the cross-phase between density and electric field fluctuations. The changes in cross-phase lead to a suppression and then apparent reversal of turbulent particle flux as the threshold is exceeded.

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“…The EEDF can be modifi ed to some extent by controlling the feed gas rate into the discharge region [55]. A Mach probe, slit probe (SP) and directional Langmuir probe (DLP) are used for the plasma fl ow measurement [56,57]. An L-shaped electrostatic probe is applied in a laser photodetachment (LPD) system for negative ion density measurements, which is combined with a dye laser pumped by second harmonic Nd:YAG laser pulses (532 nm) or with a Nd:YAG laser (532 or 1064 nm).…”

Section: Diagnosticsmentioning

confidence: 99%

Diagnostics of Recombining Plasmas in Divertor Simulator MAP-II

Kado

Iida

Kajita

et al. 2005

J. Plasma Fusion Res.

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Atomic and molecular processes in volumetric recombination phenomena relevant to divertor detachment are investigated in a divertor simulator MAP (Material and Plasma) -II. In the recombining plasmas, quantitative measurements of parameters, especially using a Langmuir probe, are diffi cult, so that the development of alternative diagnostics is important. Recombination can be induced in He plasma by puffi ng of He or H 2 . In the He puffi ng case, the Rydberg spectra show an electron temperature of lower than 0.1 eV, while in the H 2 puffi ng case, the Rydberg spectra disappear even though the reduction of the ion fl ux is apparent, showing that another type of recombination occurs. Negative hydrogen ions are observed in the peripheral region of the plasma column.

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Practical formula for Mach number probe diagnostics in weakly magnetized plasmas

Cited by 29 publications

References 17 publications

Examination of the velocity time-delay-estimation technique

Examination of the velocity time-delay-estimation technique

Modifications of turbulence and turbulent transport associated with a bias-induced confinement transition in the Large Plasma Device

Diagnostics of Recombining Plasmas in Divertor Simulator MAP-II

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