A theory of probes in high-pressure strongly-ionized plasmas

Baksht, F. G.; Rybakov, A. B.

doi:10.1134/1.1258882

Cited by 8 publications

(19 citation statements)

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“…T ep and n ep are determined by applying equations (6) and (1) to measured probe characteristics. T e (0) and n e (0) are attained from spectroscopic measurements at the arc column.…”

Section: Interpretation Of the Probe Measurementsmentioning

confidence: 99%

Determination of HID electrode falls in a model lamp II: Langmuir-probe measurements

Luhmann

Lichtenberg

Langenscheidt

et al. 2002

J. Phys. D: Appl. Phys.

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A special measuring method with Langmuir probes was established which yields the plasma potential in high-pressure plasmas to determine separate cathode and anode falls of HID electrodes. The probes consist of two tungsten wires which are inserted via side arms into the discharge tube of a model lamp. Their bended ends form together a full circle which surrounds the arc at its boundary. One probe is operated at floating potential with the other one a current-voltage characteristic of the probe is recorded. Its shape corresponds to that taken with a plane probe in a low-pressure plasma. Taking into account the radial voltage drop between the axis and the boundary of the arc, it was shown that the inflection point between the retarded electron current and electron saturation current represents the plasma potential in the arc axis. The electrode falls were determined by an extrapolation of the plasma potential which was measured along the arc axis towards the electrodes. Cathode and anode fall measurements at tungsten electrodes of different diameters are presented which were performed with an arc in argon at 0.26 MPa at currents between 1.5 and 6 A.

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“…T ep and n ep are determined by applying equations (6) and (1) to measured probe characteristics. T e (0) and n e (0) are attained from spectroscopic measurements at the arc column.…”

Section: Interpretation Of the Probe Measurementsmentioning

confidence: 99%

Determination of HID electrode falls in a model lamp II: Langmuir-probe measurements

Luhmann

Lichtenberg

Langenscheidt

et al. 2002

J. Phys. D: Appl. Phys.

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“…The above-mentioned conclusions of the work [7] indicate that (1) is inapplicable under the conditions of a very hot plasma. A question arises as to whether any conditions of a high-pressure plasma exist under which this relationship is justified.…”

Section: Introductionmentioning

confidence: 75%

“…In other words, the probe characteristic is described in such a case by an equation similar to (38) with n e∞ , φ w , and T e∞ being replaced, respectively, by the charged-particle density at the edge of the layer, by the difference between φ w and the potential at the edge, and by the electron temperature in the layer. Such a simplification was exploited in [7].…”

Section: Discussionmentioning

confidence: 99%

“…An adequate theoretical justification of such an approach in the case of a high-pressure plasma should be based on the analysis of hydrodynamic equations describing current transfer to the probe, taking into account the variability of the electron temperature in the near-probe perturbation region. Such an analysis was previously performed [7] for the case when the temperature of the undisturbed plasma is quite high (about 2.5 eV or higher). It was assumed that the nearprobe space-charge sheath is collisionless and that the length scale on which the heavy-particle temperature relaxes due to electron-ion collisions to the electron temperature is much larger than the ionization length and much smaller than the probe dimensions.…”

Section: Introductionmentioning

confidence: 99%

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Can the temperature of electrons in a high-pressure plasma be determined by means of an electrostatic probe?

Benilov

2000

J. Phys. D: Appl. Phys.

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The ion branch of a current-voltage characteristic of a Langmuir probe in a high-pressure plasma is theoretically analysed. In a wide range of conditions, perturbations created by the probe current are localized in a thin near-wall layer and a semi-logarithmic plot of the dependence of the electron current on the probe potential is close to a straight line. The value of the electron temperature that can be determined from this plot refers to the edge of the above-mentioned near-wall layer. A range of plasma parameters exists in which a variation of the electron temperature in the near-probe region is small and the above value is close to the electron temperature in the undisturbed plasma. Numerical calculation of the ion saturation current to, and the floating potential of, a wall probe in a cylindrical tube confining an arc discharge is presented.

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“…In order to be able to conduct local measurements, we have designed a set of magnetic and double electric probes [11,12]. Double electric probes are very useful for measurements of the electron temperature with good temporal and spatial resolution in various devices [13][14][15][16]. The advantage of a double probe is that it does not require a reference electrode, decreases plasma perturbations, and limits collected current to the ion saturation current [16].…”

Section: Introductionmentioning

confidence: 99%

Structure and local parameters of self-compressed plasma streams in external magnetic field

et al. 2023

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The influence of the external axial magnetic field on pinching plasma flows generated by a magnetoplasma compressor (MPC) has been studied using magnetic and electric probes. In the presence of an external magnetic field, temperature measurements show two groups of electrons with different temperatures near the plasma stream core. The external magnetic field leads to a noticeable increase in the electric current in the plasma stream, electron temperature, and the formation of the current-sheet-like structure observed in the MPC for the first time.

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A theory of probes in high-pressure strongly-ionized plasmas

Cited by 8 publications

References 0 publications

Determination of HID electrode falls in a model lamp II: Langmuir-probe measurements

Determination of HID electrode falls in a model lamp II: Langmuir-probe measurements

Can the temperature of electrons in a high-pressure plasma be determined by means of an electrostatic probe?

Structure and local parameters of self-compressed plasma streams in external magnetic field

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