TESTRICH, Holger, Dirk PASEDAG, Zdeněk NAVRÁTIL, B. MAY, Rene REIMER, Christian WILKE and Hans-Erich WAGNER. Investigations on the stability of the low pressure positive column in oxygen. Journal of Physics D: Applied Physics. Bristol, England: IOP Publishing Ltd., 2009, vol. 42, No 14, p. 145207-145216. ISSN 0022-3727.
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Basic information
Original name Investigations on the stability of the low pressure positive column in oxygen
Name in Czech Zkoumání stability nízkotlakého kladného sloupce v kyslíku
Authors TESTRICH, Holger (276 Germany), Dirk PASEDAG (276 Germany), Zdeněk NAVRÁTIL (203 Czech Republic, guarantor), B. MAY (276 Germany), Rene REIMER (276 Germany), Christian WILKE (276 Germany) and Hans-Erich WAGNER (276 Germany).
Edition Journal of Physics D: Applied Physics, Bristol, England, IOP Publishing Ltd. 2009, 0022-3727.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10305 Fluids and plasma physics
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
WWW URL
Impact factor Impact factor: 2.083
RIV identification code RIV/00216224:14310/09:00036177
Organization unit Faculty of Science
UT WoS 000267944000036
Keywords in English instability;glow discharge;positive column;oxygen;waves
Tags glow discharge, instability, Oxygen, positive column, waves
Tags International impact, Reviewed
Changed by Changed by: doc. Mgr. Zdeněk Navrátil, Ph.D., učo 3323. Changed: 2/7/2009 17:01.
Abstract
The stability of low pressure positive column in oxygen was investigated. The studied H- to T-mode transition showed a marked hysteresis in the E(I) characteristics which is affected by wall processes. At small discharge current the el. field showed a significant modulation, characterized by incoherent fluctuations with a broadband Fourier spectrum. With increasing current the discharge operates in the T-mode, where a mode selection with high modulation degree occurred, resulting in a periodic oscillation of the electric field at a discrete frequency spectrum. The dynamic state in the T-mode is expressed by T-waves moving from the cathode to the anode. The stability was studied using a hydrodynamic model considering electrons, positive and negative ions as well as metastable O2 molecules. In good agreement with the experiments the transition was explained as a linear unstable equilibrium state where the energy dependence of the corresponding rate coefficients is the driving mechanism.
Abstract (in Czech)
Byla zkoumána stabilita nízkotlakého kladného sloupce v kyslíku v rozsahu tlaku 0,5 až 0,9 Torr a proudu 0,5 až 90 mA. Zejména byl studován přechod mezi dobře známými módy T a H. Stabilita výboje byla studována pomocí hydrodynamického modelu. Přechod mezi H a T módem byl vysvětlen jako lineárně nestabilní rovnovážný stav, kde ve kterém řídícím mechanismem je energiová závislost rychlostních koeficientů ("attachment-induced instability").
Links
MSM0021622411, plan (intention)Name: Studium a aplikace plazmochemických reakcí v neizotermickém nízkoteplotním plazmatu a jeho interakcí s povrchem pevných látek
Investor: Ministry of Education, Youth and Sports of the CR, Study and application of plasma chemical reactions in non-isothermic low temperature plasma and its interaction with solid surface
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