The triple-probe method applied to the direct display of plasma parameters in a supersonic flowing continuum plasma

Abstract

The calibration of electrostatic triple-probe voltage and current response in a supersonic continuum plasma has been carried out using a low-pressure shock tube. The electron temperature Te and charge number density Ne are compared to probe voltage and current response, respectively, for a useful range of plasma parameters (1≲Rp/λD≲10, 2≲M≲5, and 7<φ13<35, where Rp is the probe radius, λD is the Debye length, M is the shock Mach number, and φ13 is the nondimensional probe voltage). The dependence of probe response on Debye ratio Rp/λD and various flow parameters was investigated. The probe voltage response was found to depend significantly on the Debye ratio. Expressions for electron temperature determination by triple probe are presented.

Multifrequency Method for Measuring Properties of Shock Tube Produced Plasma

“…In terms of the experiments, there have been various probe techniques to measure the plasma [16], [17], such as the Langmuir probe [18], the triple probe [19], the hollow probe [20], and the magnetic probe [21]. However, the probe technique has obvious limitations when measuring high-speed, time-varying, or nonreproducible plasma.…”

Spatial inhomogeneity effects on burst temperature estimation using a triple probe configuration in Tokamak Chauffage Alfvén Brésilien tokamak

“…The limitations in the time resolution do not affect the triple probe technique, proposed by Chen & Sekiguchi (1965), that has been a widely used method for plasma temperature measurements (Ogram, Chang & Hobson 1979; Budaev & Ivanov 1989; Castro & Heller 1996; Gatsonis et al. 2004; Qayyum et al.…”

“…Several practical difficulties related to the implementation of a sweeping probe system at high frequencies (∼100 kHz) are exposed in Boedo et al (1999) and Nagashima et al (2015). The limitations in the time resolution do not affect the triple probe technique, proposed by Chen & Sekiguchi (1965), that has been a widely used method for plasma temperature measurements (Ogram, Chang & Hobson 1979;Budaev & Ivanov 1989;Castro & Heller 1996;Gatsonis et al 2004;Qayyum et al 2015). Unlike the Langmuir sweep probe technique, the triple probe technique uses three Langmuir probes.…”

Effect of Supersonic Ion Beams on the Triple Probe Measurement

“…In the case of supersonic flow, there is no significant effects of the Mach and Reynold numbers on TP measurements. [3] In the transient and turbulent plasma such as tokamak [4][5][6], and reverse field pinch [7,8], TP is often used for the measurement of the electron temperature and density fluctuations. The multi-pin configuration working as TP is suggested to be compensated, since three probes of a TP do not often pick up plasma signal at the same plasma potential, that is, to avoid the local gradients of plasma parameters.…”