Electromagnetic Particle‐In‐Cell simulation on the impedance of a dipole antenna surrounded by an ion sheath

Miyake, Yohei; Kojima, Hirotsugu; Omura, Yoshiharu; Matsumoto, Hiroshi

doi:10.1029/2007rs003707

Cited by 8 publications

(15 citation statements)

References 24 publications

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“…The sheath capacitance was analytically calculated from the Debye length. Such calculations are a simpler method in comparison with the PIC simulations (Miyake et al, 2008), and as a result, our method does not then require enormous computer facility.…”

Section: Discussionmentioning

confidence: 99%

“…Impedance measurements in a laboratory plasma showed resonances of a long dipole antenna (Blackwell et al, 2007). 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).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

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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“…We assume that the sun illuminates the spacecraft body and the sensors from the + x direction. The boundary conditions for the outer edges of the simulation box are selected to give an isolated system [ Miyake et al , 2008]. We employ the Dirichlet condition for the outer boundary values of the electrostatic potential.…”

Section: Simulation Modelmentioning

confidence: 99%

Plasma particle simulations on stray photoelectron current flows around a spacecraft

2012

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[1] In tenuous space plasmas, photoelectron flows produce complex current paths among multiple conducting elements of spacecraft, which may influence the current-voltage characteristics of double-probe electric field sensors. We performed full-particle simulations on this effect by assuming a sensor configuration that is typical of recent designs like those on Cluster, THEMIS, and BepiColombo/MMO; the spherical probe is separated from a conducting boom by biased electrodes known as the 'stub' and the 'guard'. The assumed bias potential scheme corresponds to that planned for BepiColombo/MMO and is different from those used in the other satellites. The analysis focuses on stray photoelectron currents flowing from these electrodes and a spacecraft body. Photoelectrons approaching the probe are commonly repelled by the guard, the potential of which is strongly biased negatively, and are subsequently affected by the probe potential. Consequently, the photoelectron current magnitude increases with increasing probe potential regardless of their origins, when the probe operates between the plasma and floating spacecraft potentials. The result indicates that both photoelectron currents from the spacecraft body and biased electrodes can be minimized by selecting the probe working potential as close as possible to the plasma potential. We also examine the photoelectron current dependence on the presence or absence of the guard electrode operation and confirm a positive effect of reducing the photoelectron current from the spacecraft. However, negative side effects of the guard operation enhance the photoelectron currents from the stub and guard, when the probe operates nearly at the plasma potential.Citation: Miyake, Y., H. Usui, H. Kojima, and H. Nakashima (2012), Plasma particle simulations on stray photoelectron current flows around a spacecraft,

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“…We then consider a photoemitting situation assuming that the sun illuminates the spacecraft body and the sensors from the + x direction perpendicular to the sensor axis. The boundary conditions for the outer edges of the simulation box are selected so as to realize an isolated system [ Miyake et al , 2008]. We use the Neumann condition for the electrostatic potential obtained from Poisson's equation.…”

Section: Numerical Modelmentioning

confidence: 99%

Effects of the guard electrode on the photoelectron distribution around an electric field sensor

2011

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[1] We have developed a numerical model of a double-probe electric field sensor equipped with a photoelectron guard electrode for the particle-in-cell simulation. The model includes typical elements of modern double-probe sensors on, e.g., BepiColombo/ MMO, Cluster, and THEMIS spacecraft, such as a conducting boom and a preamplifier housing called a puck. The puck is also used for the guard electrode, and its potential is negatively biased by reference to the floating spacecraft potential. We apply the proposed model to an analysis of an equilibrium plasma environment around the sensor by assuming that the sun illuminates the spacecraft from the direction perpendicular to the sensor deployment axis. As a simulation result, it is confirmed that a substantial number of spacecraft-originating photoelectrons are once emitted sunward and then fall onto the puck and sensing element positions. In order to effectively repel such photoelectrons coming from the sun direction, a potential hump for electrons, i.e., a negative potential region, should be created in a plasma region around the sunlit side of the guard electrode surface. The simulation results reveal the significance of the guard electrode potential being not only lower than the spacecraft body but also lower than the background plasma potential of the region surrounding the puck and the sensing element. One solution for realizing such an operational condition is to bias the guard potential negatively by reference to the sensor potential because the sensor is usually operated nearly at the background plasma potential.Citation: Miyake, Y., H. Usui, and H. Kojima (2011), Effects of the guard electrode on the photoelectron distribution around an electric field sensor,

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Electromagnetic Particle‐In‐Cell simulation on the impedance of a dipole antenna surrounded by an ion sheath

Cited by 8 publications

References 24 publications

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

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

Plasma particle simulations on stray photoelectron current flows around a spacecraft

Effects of the guard electrode on the photoelectron distribution around an electric field sensor

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