Double and Triple Langmuir Probes Measurements in Inductively Coupled Nitrogen Plasma

Naz, Muhammad Yasin; Ghaffar, Abdul; Rehman, Najeeb Ur; Naseer, S.; Zakaullah, and Muhammad

doi:10.2528/pier10110309

Cited by 42 publications

(49 citation statements)

References 18 publications

(31 reference statements)

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“…This increasing trend in kT e under the influence of rising ac input voltage might be due to the increase in kinetic energy of the discharge plasma electrons. But the most important reason of this increment is the availability of more and more highly energetic electrons in high energy tail of the electron energy distribution function (EEDF) at relatively higher input voltages [19]. As the relation for mean energy of electrons is:…”

Section: Discussionmentioning

confidence: 99%

OPTICAL CHARACTERIZATION OF 50 Hz ATMOSPHERIC PRESSURE SINGLE DIELECTRIC BARRIER DISCHARGE PLASMA

Naz¹,

Ghaffar²,

Rehman³

et al. 2012

PIER M

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Abstract-A low frequency (50 Hz) dielectric barrier discharge (DBD) system with a single dielectric cover on copper coil anode is designed to generate and sustain the micro-discharge plasma which is very practical for material processing applications. The DBD system is powered by a high tension ac source consisting of a conventional step up transformer and variac. The dielectric barriers (quartz and glass) between the conducting electrodes appreciably influences the discharge plasma characterized by optical emission spectroscopy technique. Using intensity ratio method, the electron temperature and electron number density are determined from recorded spectra as function of ac input voltage, type and thickness of dielectric barrier and inter-electrode gap. It is observed that both the electron temperature and electron number density increase with the increase in ac input voltage and ε r / d ratio, while a decreasing trend is observed with increase in inter-electrode gap.

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Section: Discussionmentioning

confidence: 99%

OPTICAL CHARACTERIZATION OF 50 Hz ATMOSPHERIC PRESSURE SINGLE DIELECTRIC BARRIER DISCHARGE PLASMA

Naz¹,

Ghaffar²,

Rehman³

et al. 2012

PIER M

Self Cite

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“…Plasma technology is a kind of technology with novel concept and newly working principle, and its latent application in electromagnetic (EM) field is splendid, such as plasma stealth technology [1][2][3], plasma antennas [4][5][6], plasma diagnostic [7,8], plasma photonic crystals [9] and communications through plasma sheath [10][11][12][13][14]. It is very important to find out the mechanism and phenomena about the interactions between EM wave and plasma in the study of this technology.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Propagation and Polarization Characteristics of Electromagnetic Waves Through Nonuniform Magnetized Plasma Slab Using Propagator Matrix Method

Yin¹,

Hou²,

Sun³

et al. 2013

PIER

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Abstract-An analytical technique referred to as the propagator matrix method (PMM) is presented to study the problem of electromagnetic (EM) waves interacting with the nonuniform magnetized plasma. In this method, the state vector is proposed to describe the characteristics of eigen waves in anisotropic medium, and state vectors at two different locations are related with each other by the propagator matrix. This method can be used to deal with the phenomenon of the transformation of EM wave polarization induced by anisotropic magnetized plasma, besides the conventional propagation characteristics through plasma slab, which overcomes the drawback of other analytical methods introduced in former studies. The EM problem model considered in this work is a steady-state, two-dimensional, nonuniform magnetized plasma slab with arbitrary magnetic declination angle, which is composed of a number of subslabs. Each subslab has a fixed electron density, and the overall density profile across the whole slab follows any practical distribution function. Based on PMM, a significant feature of strong transformation of EM wave polarization is addressed when an incident wave normally projects on the slab, which leads to the reflected or transmitted waves containing two kinds of waves, i.e., the co-polarized wave and the cross-polarized wave. The effects of varying the plasma parameters on the reflected and transmitted powers of co-polarization and cross-polarization, as well as the absorptive power

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“…In the limit eV d3 >> 2kT e , Eq.5 simplifies to kT e = eV d2 /ln 2. 9 In addition, if assumptions 2, 4, and 5 are valid…”

Section: B Langmuir Probesmentioning

confidence: 99%

Radial Profiles of Plasma Electron Characteristics in a 30 kW Arc Jet

Codron

Nawaz

2013

44th AIAA Plasmadynamics and Lasers Conference

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The present effort aims to strengthen modeling work conducted at the NASA Ames Research Center by measuring the critical plasma electron characteristics within and slightly outside of an arc jet plasma column. These characteristics are intended to give physical insights while assisting in the formulation of boundary conditions to validate full scale simulations. Single and triple Langmuir probes have been used to achieve estimates of the electron temperature (T e ), electron number density (n e ) and plasma potential (outside of the plasma column) as probing location is varied radially from the flow centerline. Both the electron temperature and electron number density measurements show a large dependence on radial distance from the plasma column centerline with T e ≈ 3 -12 eV and n e ≈ 10 12 -10 14 cm -3 . Nomenclature

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Double and Triple Langmuir Probes Measurements in Inductively Coupled Nitrogen Plasma

Cited by 42 publications

References 18 publications

OPTICAL CHARACTERIZATION OF 50 Hz ATMOSPHERIC PRESSURE SINGLE DIELECTRIC BARRIER DISCHARGE PLASMA

OPTICAL CHARACTERIZATION OF 50 Hz ATMOSPHERIC PRESSURE SINGLE DIELECTRIC BARRIER DISCHARGE PLASMA

Analysis of Propagation and Polarization Characteristics of Electromagnetic Waves Through Nonuniform Magnetized Plasma Slab Using Propagator Matrix Method

Radial Profiles of Plasma Electron Characteristics in a 30 kW Arc Jet

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