Cold-hollow-cathode arc discharge in crossed electric and magnetic fields |
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Authors: | P M Schanin N N Koval Yu Kh Akhmadeev S V Grigoriev |
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Institution: | (1) Institute of High Current Electronics, Siberian Division, Russian Academy of Sciences, Akademicheskii pr. 4, Tomsk, 634055, Russia |
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Abstract: | A crossed-field cold-hollow-cathode arc is stable at low working gas pressures of 10−2–10−1 Pa, magnetic-field-and gas-dependent arcing voltages of 20–50 V, and discharge currents of 20–200 A. This is because electrons
come from a cathode spot produced on the inner cathode surface by a discharge over the dielectric surface. The magnetic field
influences the arcing voltage and discharge current most significantly. When the plasma conductivity in the cathode region
decreases in the electric field direction, the magnetic field increases, causing the discharge current to decline and the
discharge voltage to rise. The discharge is quenched when a critical magnetic field depending on the type of gas is reached.
Because of the absence of heated elements, the hollow cathode remains efficient for long when an arc is initiated in both
inert and chemically active gases. |
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Keywords: | |
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