Electrical Probes for Plasma Diagnostics

Swift, J. D.; Schwar, M. J. R.; Keller, John H.

doi:10.1149/1.2408098

Cited by 190 publications

(313 citation statements)

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“…The holder can move in the axial and radial direction of the plasma jet. According to the theory of the double electrostatic probe [13,14], the electron temperature T e can be deduced from the measured voltage-current (VeI) characteristic curve and the electron temperature is presented here as the averaged value of at least five measured data at each spatial position.…”

Section: Methodsmentioning

confidence: 99%

“…The electron temperature and the excitation temperature of the DC arc plasma jets generated at reduced pressure are measured by using the double electrostatic-probe method [13,14] and the spectroscopic-intensity Boltzmann-plot method [4] respectively, and the thermocouple method is also used as an attempt to measure the gas temperature. The reason for the significant deviation of the gas temperature indicated by the thermocouple reading from the measured excitation temperature has been analyzed based on a theoretical analysis considering the rarefiedgas effects on heat transfer from the low-pressure plasma flow to the thermocouple.…”

Section: Introductionmentioning

confidence: 99%

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Temperature measurements in a laminar plasma jet generated at reduced pressure

Meng

Pan

Chen

et al. 2011

Vacuum

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a b s t r a c t Double electrostatic probe method and Boltzmann-plot method are applied to measure the electron temperature and the excitation temperature of a DC laminar argon plasma jet generated at reduced pressure. Attempts are also made to measure the gas temperature by using a pair of WRe-5/26 thermocouple. Experimental results show that the measured excitation temperature at the jet center increases with the vacuum chamber pressure and the arc current, but is appreciably lower than the measured electron temperature, indicating that the plasma jet under study is evidently deviated from the LTE state. The temperature indicated by the thermocouple probe is much lower than the measured excitation temperature and electron temperature. Theoretical analysis shows that the thermocouple method intended for gas temperature measurement contains very large errors due to rarefied-gas heat transfer effects, and thus is unsuitable for this purpose.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature measurements in a laminar plasma jet generated at reduced pressure

Meng

Pan

Chen

et al. 2011

Vacuum

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show abstract

“…One will notice, however, that eqn. 1 already has inaccuracies in that even though the electrons form the fluid under question, it is the ion current that is used in the fit, as opposed to the electron current as is the case with non-magnetized discharge probe interpretation [19,20].…”

Section: Theorymentioning

confidence: 99%

Modification Of The Electron Energy Distribution Function During Lithium Experiments On The National Spherical Torus Experiment

Jaworski¹,

Gray²,

Kaita³

et al. 2011

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The National Spherical Torus Experiment (NSTX) has recently studied the use of a liquid lithium divertor (LLD). Divertor Langmuir probes have also been installed for making measurements of the local plasma conditions. A non-local probe interpretation method is used to supplement the classical probe interpretation and obtain measurements of the electron energy distribution function (EEDF) which show the occurrence of a hot-electron component. Analysis is made of two discharges within a sequence that exhibited changes in plasma fueling efficiency. It is found that the local electron temperature increases and that this increase is most strongly correlated with the energy contained within the hot-electron population. Preliminary in- scrape-off layer (SOL) plasma. The decrease in plasma fueling efficiency, increase in local temperature, and increase in hot-electron fraction are all consistent with an absorbing surface intercepting the SOL plasma.

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“…following Swift and Schwar (1970). For those conditions in which the electron temperature remains fairly constant, the electron density can be simply related to the saturated ion current to the probe.…”

Section: Plasma Production and Measurementsmentioning

confidence: 99%

Experimental Studies of Plasma Confined in a Toroidal Heliac

Blackwell¹,

Hamberger²,

Sharp³

et al. 1989

Aust. J. Phys.

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The design, construction and operation of the prototype heliac SHEILA are described. Gas breakdown conditions are compared with high frequency discharges. Plasma isobars obtained from local measurements are shown to agree closely with computed magnetic flux surfaces for a range of magnetic configurations. The effect of changing the configuration on fluctuation mode numbers is demonstrated and shown to be consistent with the calculated rotational transforms.

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Electrical Probes for Plasma Diagnostics

Abstract: not Available.

Cited by 190 publications

References 0 publications

Temperature measurements in a laminar plasma jet generated at reduced pressure

Temperature measurements in a laminar plasma jet generated at reduced pressure

Modification Of The Electron Energy Distribution Function During Lithium Experiments On The National Spherical Torus Experiment

Experimental Studies of Plasma Confined in a Toroidal Heliac

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