The Analysis of Probe I-V Characteristics in a Magnetized Low-Temperature Plasma

Demidov, V. I.; Ratynskaia, S.; Rypdal, Kristoffer

doi:10.1002/1521-3986(200109)41:5<443::aid-ctpp443>3.0.co;2-k

Cited by 27 publications

(66 citation statements)

References 7 publications

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“…We will outline now the FDPT main points only. Thus, the electron current flowing to a cylindrical probe when collisions in the probe sheath occur, as is typical for strongly magnetized plasma, is given [5][6][7][8] by:…”

Section: First-derivative Probe Techniquementioning

confidence: 99%

“…Electric probes still remain the most reliable diagnostic tools allowing one to obtain the local values of the important plasma parameters, namely, the plasma potential, U pl , and the electron energy distribution function. The application of the probe technique has been summarized in numerous reviews and monographs [1][2][3][4][5][6][7]. The Langmuir probe is seen as a rather simple and, thus, an attractive scientific instrument for diagnostic of gas discharge plasmas.…”

Section: Introductionmentioning

confidence: 99%

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Advantages of the first-derivative probe technique over the three- and four-parameter probe techniques in fusion plasmas diagnostics

et al. 2018

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In this work, the advantages are presented and discussed of the first-derivative probe technique over the three- and the four-parameter conventional probe techniques for diagnostics of fusion plasmas. The conventional probe techniques for estimation of the plasma potential and the electron temperature and density can only be used when the electron energy distribution function (EEDF) is Maxwellian. The first-derivative probe technique can provide reliable results for the plasma potential and the real EEDF when the latter deviates from Maxwellian. To exemplify the application of the results obtained by different techniques, results on the parallel power-flux density distribution in the divertor region of the COMPASS tokamak, IPP.CR, are presented and discussed.

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Section: First-derivative Probe Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advantages of the first-derivative probe technique over the three- and four-parameter probe techniques in fusion plasmas diagnostics

et al. 2018

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“…5. The validity of employing the classical ͑collisional͒ diffusion coefficient for our plasma conditions was justified in Ref.…”

Section: Introductionmentioning

confidence: 99%

Probe measurements of low-frequency plasma potential and electric field fluctuations in a magnetized plasma

2002

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A system of two cylindrical probes aligned along the magnetic field, and equipped with insulating end plugs, is proposed for measurement of low-frequency fluctuations of the electrostatic field in a magnetized plasma. It is demonstrated by modeling and experiments that the plug probe floats close to the plasma potential. The electric field component in a given direction is obtained by subtracting the plasma potentials obtained on two spatially separated plug probes. The probe system is applied to low-frequency electrostatic fluctuations in a simple magnetized torus, and reveals the presence of global oscillations, large scale propagating structures (mϭ1 modes͒, and developed turbulence with power-law spectra. Two different mode branches for the fluctuations are identified by comparing results from plug probes with results from conventional probes. Sources of errors arising from applying floating potential of conventional probes for electric field measurements are pointed out and discussed.

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“…The EEDF was determined by the numerical derivation of Langmuir probe current-voltage characteristics [10]. A molybdenum cylindrical probe (15 mm in length, 0.065 mm in diameter) was placed at the axis of the discharge.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The point where d 2 i/dV 2 = 0 is taken as the plasma potential. For low energies (u 0.5-1 eV) the EEDFs are distorted by a number of effects, such as the drain of electrons to the probe, finite plasma conductivity, finite voltage increment, and others [10]. For u 2.5-3.5 eV experimental points are scattered too widely to be useful for analysis.…”

Section: Eedfmentioning

confidence: 99%

Jumps and bi-stabilities in electron energy distribution in Ar-N₂post discharge plasma

Dyatko

Ionikh

Kolokolov

et al. 2000

J. Phys. D: Appl. Phys.

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The electron energy distribution function (EEDF) in an afterglow of a pulsed direct current discharge has been measured in an Ar:N2 mixture by means of a time-resolved Langmuir probe technique. The vibrational temperature, Tv, of N2 molecules has also been experimentally estimated. The results show that a correlation between an effective electron temperature, Te, and Tv strongly varies with experimental conditions. In particular the conditions exist under which the rapid decrease from high to low Te values is observed at some moment after the discharge pulse, while the vibrational temperature remains almost constant. The theoretical study of the EEDF in Ar:N2 afterglow plasma has also been made by the numerical solution of an appropriate Boltzmann equation by taking into account electron-electron collisions as well as superelastic vibrational and superelastic electronic collisions. Calculations show that for a given Tv the value of Te depends on the electron concentration, ne. Moreover, the ranges of ne and Tv exist, where two different solutions of Boltzmann equations can be obtained. Finally, the comparison of the theoretical and experimental results is performed and an explanation of the experimentally observed phenomenon is given.

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The Analysis of Probe I-V Characteristics in a Magnetized Low-Temperature Plasma

Cited by 27 publications

References 7 publications

Advantages of the first-derivative probe technique over the three- and four-parameter probe techniques in fusion plasmas diagnostics

Advantages of the first-derivative probe technique over the three- and four-parameter probe techniques in fusion plasmas diagnostics

Probe measurements of low-frequency plasma potential and electric field fluctuations in a magnetized plasma

Jumps and bi-stabilities in electron energy distribution in Ar-N₂post discharge plasma

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The Analysis of Probe I-V Characteristics in a Magnetized Low-Temperature Plasma

Cited by 27 publications

References 7 publications

Advantages of the first-derivative probe technique over the three- and four-parameter probe techniques in fusion plasmas diagnostics

Advantages of the first-derivative probe technique over the three- and four-parameter probe techniques in fusion plasmas diagnostics

Probe measurements of low-frequency plasma potential and electric field fluctuations in a magnetized plasma

Jumps and bi-stabilities in electron energy distribution in Ar-N2post discharge plasma

Contact Info

Product

Resources

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Jumps and bi-stabilities in electron energy distribution in Ar-N₂post discharge plasma