Role of return current in the excitation of electronmagnetohydrodynamic structures by biased electrodes

Ganesh, R.; Mattoo, S. K.; Awasthi, L. M.; Srivastava, P. K.; Anitha, V. P.

doi:10.1017/s0022377812000074

Cited by 1 publication

(2 citation statements)

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“…each blob behaves like an emissive probe). A pioneering work on dipole probes was carried out at UCLA by Stenzel [2], but the novelty of our work lies in the successful measurement of total electric field excited by a ring electrode, making use of an in-house designed dipole probe made with commonly available and cost-effective components [23]. Through this attempt, we have widened the spectrum of its use beyond linear devices [24,25].…”

Section: Introductionmentioning

confidence: 99%

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A dipole probe for electric field measurements in the LVPD

Srivastava¹,

Awasthi²,

Ganesh³

et al. 2015

Meas. Sci. Technol.

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This paper describes the design, construction, and calibration of an electric dipole probe and demonstrates its capability by presenting results on the measurement of electric field excited by a ring electrode in the Large Volume Plasma Device (LVPD). It measures the electric field in vacuum and plasma conditions in a frequency range lying between . The results show that it measures electric field 2 mV cm−1 for frequency . The developed dipole probe works on the principle of amplitude modulation. The probe signal is transmitted through a carrier of 418 MHz, a much higher frequency than the available sources of noise present in the surrounding environment. The amplitude modulation concept of signal transmission is used to make the measurement; it is qualitatively better and less corrupted as it is not affected by the errors introduced by ac pickups. The probe is capable of measuring a variety of electric fields, namely (1) space charge field, (2) time varying field, (3) inductive field and (4) a mixed field containing both space charge and inductive fields. This makes it a useful tool for measuring electric fields in laboratory plasma devices.

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Section: Introductionmentioning

confidence: 99%

“…This identifies the point of the return current as a source for the excitation of whistlers. Reproduced with permission from Ravi et al[23]. Copyright Cambridge University Press 2012.…”

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confidence: 99%