Vol.5, No 1, 2007 pp. 1 - 10
DOI 10.2298/FUPCT0701001R
UDC 537.52; 533.9
TWO STEP CURRENT INCREASES IN GLOW DISCHARGE DEVELOPMENT IN NEON FILLED DIODE AT 4 mbar
Miodrag K. Radović1, Čedomir A. Maluckov2,
Slobodan D. Mitić1, Bratislav Radovanović1
1Faculty of Sciences and Mathematics, University of Niš, PO Box 224, 18001 Niš, Serbia
2Technical Faculty in Bor, University of Belgrade, Vojske Jugoslavije 12, 19210 Bor, Serbia
Abstract. The results are presented of investigating temporal and spatial development of electrical glow discharge in a neon filled tube under 4mbar pressure. Linear increasing voltage (at 5 V/s increasing voltage rate) is applied to the gas diode. Time dependence of 585.2 nm line light emitted from negative glow is observed from various positions in the diode during formation of electrical discharge. The results show that the development of glow discharge starts in the gap, and propagates to the cathode and in the space around and behind the cathode. An unexpected two-step current rise is found. In the stationary regime, most of the emitted light occupied the cathode carrier rod. This indicates the position where the secondary electron emission is intensive. It corresponds to the second step in the current increase app. 3 ms after the breakdown has already taken place. It is assumed that this step originates from different surface characteristics of the rode material. The analysis of time dependencies of the current and light from the negative glow, from different positions in the gas diode, suggests that the observation of deexcitation processes in gas can be used for determination of early discharge formative processes, as well as processes that lead to the stationary regime in the gas diode tube.
Key words: Gas Discharges, Formative Time Delay, Electrical Measurement of Gas Discharges, Optical Measurement of Gas Discharges.
DVOSTEPENI PORAST STRUJE U RAZVOJU TINJAVOG PRAŽNJENJA U GASNOJ DIODI PUNJENOJ NEONOM
NA PRITISKU OD 4 mbar
U radu su prezentovani rezultati prostornog i vremenskog razvoja tinjavog pražnjenja u gasnoj diodi punjenoj neonom na 4 mbar. Primenjivan je linearno rastući napon sa brzinom porasta napona od 5 V/s. Detektovan je vremenski razvoj spektralne linije od 585.2 nm emitovane iz negativnog tinjanja (za različite pozicije u diodi) tokom formiranja električnog pražnjenja. Rezultati pokazuju da razvoj tinjavog pražnjenja počinje u međuelektrodnom prostoru, razvija se prema katodi i obuhvata prostor oko katode. Pored toga, detektovan je dvostepeni porast struje. U stacionarnom režimu pražnjenja najviše emitovanog svetla obuhvata nosač katode, što ukazuje na poziciju u gasnoj diodi na kojoj je emisija sekundarnih elektrona najintenzivnija. To odgovara drugoj fazi razvoja struje, za oko 3 ms nakon električnog proboja. Ovo ukazuje da dvostepeni porast struje potiče od različitih površinskih karakteristika nosača elektroda. Analiza vremenskog porasta električne struje i emitivanog svetla iz negativnog tinjanja, za različite pozicije u diodi, ukazuje da detektovanje deekscitacionih procesa u gasu može biti iskorišćeno za određivanje rane faze formativnih procesa i procesa koji dovode do stacionarnog režima u gasnoj diodi.
