The impedance of a short dipole antenna in a magnetized plasma via a finite difference time domain model

Ward, Jeffrey D.; Swenson, C.; Furse, Cynthia

doi:10.1109/tap.2005.851823

Cited by 32 publications

(23 citation statements)

References 28 publications

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“…4,17,18 In addition, the resonance at x pe can be quite close to the space charge sheath resonant peaks. 21 Dependence of the antenna impedance characteristics on the dipole orientation relatively to the magnetic field is illustrated in Fig.…”

Section: Short Dipole In Magnetized Plasmamentioning

confidence: 67%

“…[18][19][20] This theory is limited to short antennas compared to the wavelength and assumes linear filamentary current distribution in a thin dipole. One of the strengths of this theory is that the angle between the magnetic field and the dipole can be arbitrary and not limited to a simple case of 0 or 90 .…”

Section: Short Dipole In Magnetized Plasmamentioning

confidence: 99%

“…Analysis of Eq. (1) as well as numerical simulation of a short dipole in magnetized plasma 18 shows that two main impedance resonances can occur when changing a signal frequency: a resonance at the plasma frequency x ¼ x pe and at the upper hybrid resonance at a frequency x uh , where…”

Section: Short Dipole In Magnetized Plasmamentioning

confidence: 99%

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Matched dipole probe for magnetized low electron density laboratory plasma diagnostics

Rafalskyi

Aanesland

2015

Physics of Plasmas

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International audienceIn this paper, a diagnostic method for magnetized and unmagnetized laboratory plasma is proposed, based on impedance measurements of a short matched dipole. The range of the measured electron densities is limited to low density plasmas (10121015 m−3), where other diagnostic methods have strong limitations on the magnetic field strength and topology, plasma dimensions, and boundary conditions. The method is designed for use in both large- and small-dimension plasma (<10 cm) without or with strong non-homogeneous magnetic field, which can be undefined within the probe size. The design of a matched dipole probe allows to suppress the sheath resonance effects and to reach high sensitivity at relatively small probe dimensions. Validation experiments are conducted in both magnetized (B ∼ 170 G) and unmagnetized (B = 0) low density (7 × 1012 m−37 × 1013 m−3) low pressure (1 mTorr) 10 cm scale plasmas. The experimentally measured data show very good agreement with an analytical theory both for a non-magnetized and a magnetized case. The electron density measured by the matched dipole and Langmuir probes in the range of 7 × 1012 m−37 × 1013 m−3 show less than 30% difference. An experimentally measured tolerance/uncertainty of the dipole probe method is estimated to ±1% for plasma densities above 2 × 1013 m−3. A spatial resolution is estimated from the experiments to be about 3d, where d is the dipole diameter. The diagnostic method is also validated by comparing the measured plasma impedance curves with results of analytical modelling

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Section: Short Dipole In Magnetized Plasmamentioning

confidence: 67%

Section: Short Dipole In Magnetized Plasmamentioning

confidence: 99%

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Matched dipole probe for magnetized low electron density laboratory plasma diagnostics

Rafalskyi

Aanesland

2015

Physics of Plasmas

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“…Miyake et al (2008) developed an analysis tool of antenna impedance via Particle-In-Cell (PIC) simulation. A Plasma-Fluid Finite-Difference Time Domain (PF-FDTD) simulation was applied to estimate the collision frequency in the ionosphere (Ward et al, 2005;Spencer et al, 2008). In addition, unique characteristics of the probe impedance in a thermal magnetized plasma were found by laboratory experiments (Suzuki et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Sheath capacitance observed by impedance probes onboard sounding rockets: Its application to ionospheric plasma diagnostics

et al. 2010

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Ion sheath which is formed around an electrode signi cantly affects the impedance of the probe immersed in a plasma. The sheath capacitances obtained from impedance probe measurements were examined for application to plasma diagnoses. We compared analytical calculations of the sheath capacitance with measurements from impedance probes onboard ionospheric sounding rockets. The S-520-23 sounding rocket experiment, which was carried out in mid-latitude, demonstrated that the observed sheath capacitances agreed well with those of the calculations. We concluded that the sheath capacitance measurements allow for estimation of the electron temperature and the electron density of a Maxwellian plasma. On the other hand, the sheath capacitances obtained from the S-310-35 rocket experiment in the auroral ionosphere showed lower values than expected. Auroral particles precipitations should modify the probe potential.

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“…The use of impedance measurements for space physics research is still a fairly active field, but there have also been new applications; for example, plasma electron density measurements under experimental conditions that make it difficult to get Langmuir probe readings, such as plasma thrusters [11] and processing plasmas [14]. There is also a desire to understand antenna-plasma coupling better with the application of developing improved methods for plasma wave launching and detection in ionospheric and space environments [15]. Finally, there are basic plasma physics issues that can be uncovered with antenna impedance measurements [17].…”

Section: Introductionmentioning

confidence: 99%

Antenna Impedance Measures in a Magnetized Plasma. Part 1. Spherical Antenna

Blackwell¹,

Walker²,

Messer³

et al. 2006

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The input impedance of a metal sphere immersed in a magnetized plasma is measured with a network analyzer at frequencies up to 1 GHz. The experiments were done in the Space Physics Simulation Chamber at the Naval Research Laboratory. The hot-filament argon plasma was varied between weakly (w ce < w pe ) and strongly (w ce > w pe ) magnetized plasma with electron densities in the range 10 7 -10 10 cm -3 . It is observed that the lower-frequency resonance of the impedance characteristic previously associated with series sheath resonance w sh in the unmagnetized plasma occurs at a hybrid sheath frequency of w r = w sh + kw ce , with k a constant 0.5 < k < 1. As seen in previous experiments, the higher frequency resonance associated with the electron plasma frequency w pe in the unmagnetized plasma is relocated to the upper hybrid frequency w uh = w pe + w ce . As with the unmagnetized plasma, the maximum power deposition occurs at the lower frequency resonance w r . i REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 DATES COVERED (From -To) Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

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The impedance of a short dipole antenna in a magnetized plasma via a finite difference time domain model

Cited by 32 publications

References 28 publications

Matched dipole probe for magnetized low electron density laboratory plasma diagnostics

Matched dipole probe for magnetized low electron density laboratory plasma diagnostics

Sheath capacitance observed by impedance probes onboard sounding rockets: Its application to ionospheric plasma diagnostics

Antenna Impedance Measures in a Magnetized Plasma. Part 1. Spherical Antenna

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