3 research outputs found

    Electron beam plasma diode with charged particle background

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    The effect of an immovable charged particle background on the stationary states of a diode with the electron beam is studied. An addition of uniform positive charged particles results in an increase in the space-charge limit of the electron current as well as in the new branches of equilibria arising. On the other hand, extra negative charged particles result in a strong decrease in current cut-off limit, the cut-off being the total one. This effect can be used to perform the fast switches.Π’ΠΈΠ²Ρ‡Π°Ρ”Ρ‚ΡŒΡΡ Π²ΠΏΠ»ΠΈΠ² Π΅Ρ„Π΅ΠΊΡ‚Ρƒ оточСння Π½Π΅Ρ€ΡƒΡ…ΠΎΠΌΠΈΠΌΠΈ зарядТСними частинками Π½Π° стаціонарні стани Π΄Ρ–ΠΎΠ΄Π° Π· Π΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Π½ΠΈΠΌ ΠΏΡƒΡ‡ΠΊΠΎΠΌ. ДоповнСння ΠΎΠ΄Π½ΠΎΡ€Ρ–Π΄Π½ΠΈΡ… ΠΏΠΎΠ·ΠΈΡ‚ΠΈΠ²Π½ΠΈΡ… зарядТСних частинок ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ΡŒ Π΄ΠΎ Π·Π±Ρ–Π»ΡŒΡˆΠ΅Π½Π½Ρ Π³Ρ€Π°Π½ΠΈΡ‡Π½ΠΎΠ³ΠΎ ΠΎΠ±ΠΌΠ΅ΠΆΠ΅Π½ΠΎΠ³ΠΎ просторовим зарядом струму Π΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠ½Ρ–Π², Π° Ρ‚Π°ΠΊΠΎΠΆ Π΄ΠΎ виникнСння Π½ΠΎΠ²ΠΈΡ… областСй Ρ€Ρ–Π²Π½ΠΎΠ²Π°Π³ΠΈ. Π— Ρ–Π½ΡˆΠΎΠ³ΠΎ Π±ΠΎΠΊΡƒ, надлишок Π½Π΅Π³Π°Ρ‚ΠΈΠ²Π½ΠΈΡ… зарядТСних частинок ΠΏΡ€ΠΈΠ·Π²ΠΎΠ΄ΠΈΡ‚ΡŒ Π΄ΠΎ сильного змСншСння Π³Ρ€Π°Π½ΠΈΡ‡Π½ΠΎΠ³ΠΎ струму, Π° Ρ‚Π°ΠΊΠΎΠΆ загального струму. Π¦Π΅ΠΉ Π΅Ρ„Π΅ΠΊΡ‚ ΠΌΠΎΠΆΠ½Π° застосувати для створСння ΡˆΠ²ΠΈΠ΄ΠΊΠΈΡ… ΠΏΠ΅Ρ€Π΅ΠΌΠΈΠΊΠ°Ρ‡Ρ–Π².Π˜Π·ΡƒΡ‡Π°Π΅Ρ‚ΡΡ влияниС эффСкта окруТСния Π½Π΅ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½Ρ‹ΠΌΠΈ заряТСнными частицами Π½Π° стационарныС состояния Π΄ΠΈΠΎΠ΄Π° с элСктронным ΠΏΡƒΡ‡ΠΊΠΎΠΌ. Π”ΠΎΠΏΠΎΠ»Π½Π΅Π½ΠΈΠ΅ ΠΎΠ΄Π½ΠΎΡ€ΠΎΠ΄Π½Ρ‹Ρ… ΠΏΠΎΠ»ΠΎΠΆΠΈΡ‚Π΅Π»ΡŒΠ½Ρ‹Ρ… заряТСнных частиц ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ ΠΊ ΡƒΠ²Π΅Π»ΠΈΡ‡Π΅Π½ΠΈΡŽ ΠΏΡ€Π΅Π΄Π΅Π»ΡŒΠ½ΠΎΠ³ΠΎ ΠΎΠ³Ρ€Π°Π½ΠΈΡ‡Π΅Π½Π½ΠΎΠ³ΠΎ пространствСнным зарядом Ρ‚ΠΎΠΊΠ° элСктронов, Π° Ρ‚Π°ΠΊΠΆΠ΅ ΠΊ возникновСнию Π½ΠΎΠ²Ρ‹Ρ… областСй равновСсия. Π‘ Π΄Ρ€ΡƒΠ³ΠΎΠΉ стороны, ΠΈΠ·Π±Ρ‹Ρ‚ΠΎΠΊ ΠΎΡ‚Ρ€ΠΈΡ†Π°Ρ‚Π΅Π»ΡŒΠ½ΠΎ заряТСнных частиц ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ ΠΊ ΡΠΈΠ»ΡŒΠ½ΠΎΠΌΡƒ ΡƒΠΌΠ΅Π½ΡŒΡˆΠ΅Π½ΠΈΡŽ ΠΏΡ€Π΅Π΄Π΅Π»ΡŒΠ½ΠΎΠ³ΠΎ Ρ‚ΠΎΠΊΠ°, Π° Ρ‚Π°ΠΊΠΆΠ΅ ΠΎΠ±Ρ‰Π΅Π³ΠΎ Ρ‚ΠΎΠΊΠ°. Π­Ρ‚ΠΎΡ‚ эффСкт ΠΌΠΎΠΆΠ½ΠΎ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΠΎΠ²Π°Ρ‚ΡŒ для создания быстрых ΠΏΠ΅Ρ€Π΅ΠΊΠ»ΡŽΡ‡Π°Ρ‚Π΅Π»Π΅ΠΉ

    Some properties of nonlinear oscillations in a diode in the space charge–limited current regime

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    Both the initial and late non-linear stages of the oscillation process in a beam vacuum diode in the space-charge-limited current regime are numerically investigated. Two different numerical methods are applied: Birdsall's code (B-code) and Ender-Kuznetsov code (EK-code). The capabilities of both codes are compared. The high accuracy of the EK-code gives an opportunity to build dispersion branches of instability. The domain of the parameter values, when simultaneously several stable dynamical states (limit cycles) exist, is found. A sharp decrease in the amplitude of oscillations is revealed already under a comparatively small (about 2.5%) spread in velocities of the electron beam

    OPTICAL INVESTIGATIONS OF THE SPONTANEOUS EXTINCTION OF THE HIGH-CURRENT KNUDSEN ARC DISCHARGE IN Cs-Ba GAS MIXTURE

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    The investigations of the spontaneous arc extinction in a switching Cs-Ba triode with a fine-mesh grid, operating in the collisionless mode, have been carried out. The use of Cs-Ba mixture, where cesium is a plasma-forming component, allowed to obtain emission currents from the cathode up go 100 A/cm2 in Cs-pressure range 10-3 - 10-2 Torr and, thus, easily attain the limits of gas current-conduction capacity
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