<i>Electrical Coronas: Their Basic Physical Mechanisms</i>

Loeb, Leonard B.; Brown, Sanborn C.

doi:10.1063/1.3047912

Cited by 211 publications

(258 citation statements)

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“…19 Using this method, we have been able to control the doping levels of large area ($mm 2 ) SiC/G so that charge neutrality and p-doping were achieved in initially strongly n-doped devices. Gating by corona discharge has been widely used in semiconductor industry to control carrier concentration in oxidized semiconductors in a contact-less fashion.…”

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confidence: 99%

Tuning carrier density across Dirac point in epitaxial graphene on SiC by corona discharge

Lartsev

Yager

Bergsten

et al. 2014

Applied Physics Letters

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We demonstrate reversible carrier density control across the Dirac point (Delta n similar to 10(13) cm(-2)) in epitaxial graphene on SiC (SiC/G) via high electrostatic potential gating with ions produced by corona discharge. The method is attractive for applications where graphene with a fixed carrier density is needed, such as quantum metrology, and more generally as a simple method of gating 2DEGs formed at semiconductor interfaces and in topological insulators.

Funding Agencies|Graphene Flagship [CNECT-ICT-604391]; Swedish Foundation for Strategic Research (SSF); Linnaeus Centre for Quantum Engineering; Knut and Allice Wallenberg Foundation; Chalmers AoA Nano; NMS (UK); EMRP project GraphOhm; EMRP within EURAMET; European Union

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mentioning

confidence: 99%

Tuning carrier density across Dirac point in epitaxial graphene on SiC by corona discharge

Lartsev

Yager

Bergsten

et al. 2014

Applied Physics Letters

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“…Within this time the voltage dropped at least 40% of the maximum value. The discharge voltage then remained at this low level for [10][11][12][13][14][15][16][17][18][19][20] s, before slowly rising back to the initial voltage. Measurements of the voltage divider signal indicated that despite the high source voltage ͑defined as the voltage at the power supply͒ in the range from 1 to 4.8 kV, the actual potential across the needle ranged approximately from 300 to 450 V. The average current through the source increased with the source voltage, and was in the range from 15 to 85 A.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, many experiments concerning the properties of corona discharges have been conducted [13][14][15] ͑for an insightful overview on mechanisms of coronas see Loeb 16 ͒ and extensive theoretical literature exists regarding these discharges. 13,[17][18][19] However, the typical configuration for creating atom beams differs considerably from experiments on the properties of corona discharges.…”

Section: Introductionmentioning

confidence: 99%

“…However, high velocities are also found within high pressure corona discharges, not as random motion of individual atoms but as bulk plasma waves. [13][14][15][16] For example, at the onset of a pulsed positive corona discharge, ionization fronts ͑streamers͒ propagate rapidly from the anode tip to the cathode plane. The velocity of the ionization front is typically 10 6 -10 8 cm/s.…”

Section: Introductionmentioning

confidence: 99%

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Generation of energetic He atom beams by a pulsed positive corona discharge

Lo¹,

Lobo

Blumberg

et al. 1997

Journal of Applied Physics

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Time-of-flight measurements were made of neutral helium atom beams extracted from a repetitive, pulsed, positive-point corona discharge. Two strong neutral peaks, one fast and one slow, were observed, accompanied by a prompt photon peak and a fast ion peak. All peaks were correlated with the pulsing of the discharge. The two types of atoms appear to be formed by different mechanisms at different stages of the corona discharge. The fast atoms had energies of 190 eV and were formed at the onset of the pulsing, approximately 0.7 s before the maximum of the photon peak. The slow peak, composed of electronically metastable He atoms, originated 30-50 s after the photon pulse, and possessed a nearly thermal velocity distribution. The velocity distribution was typical of an undisturbed supersonic expansion with a stagnation temperature of 131 K and a speed ratio of 3.6. Peak intensities and velocities were measured as a function of source voltage, stagnation pressure, and skimmer voltage. © 1997 American Institute of Physics. ͓S0021-8979͑97͒04709-9͔

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“…Ceci fait que les résultats obtenus vont mieux intégrer les effets synergiques des différents mécanismes en jeu dans le processus de décharge sur une surface de glace. [32,42,49]. Ils peuvent aussi provenir d'autres sources telles la photo-ionisation dans le gaz, induite par les photons émis lors de la désexcitation de certains atomes ou encore la production d'électrons par action des atomes métastables [50].…”

Section: Originalité Du Projetunclassified

Initiation et développement des décharges couronnes sur une surface de glace /

Ndiaye¹

2003

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Insulator surfaces exposed to tangential electric fields frequently constitute the weakest part of high voltage systems. Although a large body of experimental data on surface flashover has been accumulated and in spite of the fact that the breakdown of gas gaps has become a rather well understood phenomenon, a comprehensive physical understanding of ice surface discharge has not yet been achieved.This project aimed at investigating further, with new measurements, the basic physical processes of ice surface discharge inception and propagation. The better understanding of these processes will enable to design equipments more adapted to cold regions weather and to increase the power networks reliability in icing atmospheric conditions. Ultra high-speed photographic techniques have been applied to observe the first nanoseconds of visible discharge initiation and development on the ice surface. Since outdoors insulators have a very complex shape, a simplified physical model of rod-plane configuration has been used. The electric field inception of streamers, their propagation speed and the axial distance of critical volume have been studied.The results have been derived from Peek's experimental law and compared with those obtained in air gaps. They showed that the presence of ice surface could modify considerably corona streamers inception and propagation parameters. Several hypotheses that could be related to the ice surface discharge inception and propagation have been retained. It's possible that the interaction between the discharge and the ice surface lets occur others mechanisms not existing in air case. Charges accretion hypothesis on the ice surface has seemed to be very pertinent. The presence of these surface charges can modify considerably the local field distribution and it distorts the discharge inception and propagation parameters. Several mechanisms related to the surface charge accretion processes have also been identified. IV REMERCIEMENTSCe projet de recherche a été réalisé dans le cadre des activités de la Chaire Industrielle CRSNG/Hydro-Québec/UQAC, sur le Givrage Atmosphérique des Équipements des Réseaux Électriques (CIGELE). Je tiens alors à remercier avec ma plus profonde gratitude le Professeur Masoud Farzaneh, le titulaire de cette chaire, pour m'avoir accueilli au sein de son équipe de chercheurs et pour avoir supervisé mes travaux en qualité de directeur de recherche.Je tiens aussi à témoigner toute ma reconnaissance au Docteur Issouf Fofana, mon co-directeur de mémoire, qui a su mettre à mon égard toute sa disponibilité et son aide sans jamais arrêter de m'encourager. Je dédie ce modeste travailA mon cher père qui m'a quitté alors qu'il éclairait ma route vers le devenir qu'il m'avait prédit A ma mère, plus que jamais irremplaçable, pour son amour, ses conseils, ses encouragements et ses prières.Et à mes frères, pour la confiance qu'ils m'ont toujours témoignée.

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Electrical Coronas: Their Basic Physical Mechanisms

Cited by 211 publications

References 0 publications

Tuning carrier density across Dirac point in epitaxial graphene on SiC by corona discharge

Tuning carrier density across Dirac point in epitaxial graphene on SiC by corona discharge

Generation of energetic He atom beams by a pulsed positive corona discharge

Initiation et développement des décharges couronnes sur une surface de glace /

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