Data acquisition and control system for large volume plasma device

Patel, G.; Srivastava, P. K.; Awasthi, L. M.; Anitha, V. P.; Ganesh, R.; Patel, Paresh; Baruah, U.; Mattoo, S. K.

doi:10.1063/1.1458046

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…We traced the analog bandwidth of our DAQ prior to feeding the carrier to it. The response obtained was reasonably acceptable [27]. We gave an input of 450 mV RMS through the RF generator, which was shown by the VXI as 447 mV RMS and the corresponding peak-to-peak value was 633 mV at 1 kHz.…”

Section: (A))mentioning

confidence: 87%

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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: (A))mentioning

confidence: 87%

“…Finally, last in this sequence is the DAQ system. The DAQ system used is a VXI-based one [27]. This system enables us to resolve the signals obtained from the measurement of electric field using the dipole probe.…”

Section: Design Details Hardware and Experimental Setupmentioning

confidence: 99%

A dipole probe for electric field measurements in the LVPD

Srivastava¹,

Awasthi²,

Ganesh³

et al. 2015

Meas. Sci. Technol.

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show abstract

“…An inexpensive probe drive has allowed us to obtain one-dimensional variation of field parameters, but not topology of the field vectors. The data are acquired using a VXI-based data acquisition system [12]. Figure 2 shows temporal profiles of the collected current and the corresponding perturbed magnetic field B z at various axial locations from the antenna.…”

Section: Methodsmentioning

confidence: 99%

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

Ganesh¹,

Mattoo²,

Awasthi³

et al. 2012

J. Plasma Phys.

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“…A 16 channel Guide User Interface (GUI) based VXI system capable of sampling rate of maximum 1 Gs=s is used for data acquisition. 29 Analysis platforms of Matlab TM and Origin TM are used for post processing and analysis of the acquired data. Fluctuations in plasma parameters are subjected to FFT techniques for analysis.…”

Section: Experimental Set Upmentioning

confidence: 99%

Plasma response to electron energy filter in large volume plasma device

et al. 2013

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An electron energy filter (EEF) is embedded in the Large Volume Plasma Device plasma for carrying out studies on excitation of plasma turbulence by a gradient in electron temperature (ETG) described in the paper of Mattoo et al. [S. K. Mattoo et al., Phys. Rev. Lett. 108, 255007 (2012)]. In this paper, we report results on the response of the plasma to the EEF. It is shown that inhomogeneity in the magnetic field of the EEF switches on several physical phenomena resulting in plasma regions with different characteristics, including a plasma region free from energetic electrons, suitable for the study of ETG turbulence. Specifically, we report that localized structures of plasma density, potential, electron temperature, and plasma turbulence are excited in the EEF plasma. It is shown that structures of electron temperature and potential are created due to energy dependence of the electron transport in the filter region. On the other hand, although structure of plasma density has origin in the particle transport but two distinct steps of the density structure emerge from dominance of collisionality in the source-EEF region and of the Bohm diffusion in the EEF-target region. It is argued and experimental evidence is provided for existence of drift like flute Rayleigh-Taylor in the EEF plasma.

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Data acquisition and control system for large volume plasma device

Cited by 12 publications

References 3 publications

A dipole probe for electric field measurements in the LVPD

A dipole probe for electric field measurements in the LVPD

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

Plasma response to electron energy filter in large volume plasma device

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