Oscillation phenomena of a plasma produced by an AC driven hot cathode

Journal Article · Tue Nov 06 04:00:00 EST 2012 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4766576· OSTI ID:22075728

Takahashi, Yuki; Miyamoto, Naoki; Kasuya, Toshiro; Wada, Motoi ^[1]

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1. Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)

Amplitude of oscillating discharge current has been measured for Bernas-type ion source equipped with an alternating current heated hot tungsten filament cathode. Measurements have been made by changing the filament diameter from 0.2 mm to 0.7 mm, and by changing the DC discharge current from 0.1 A to 1.5 A. The fluctuation amplitude of the discharge current was found decreased as the diameter of the filament was enlarged. The fluctuation amplitude took the minimum value at a frequency from several hundred Hz to 1 kHz depending upon the filament diameter and DC discharge current. For example, the relative oscillation amplitude was the smallest at 1 kHz for 0.7 mm diameter filament. Increase in discharge current had reduced the minimum oscillation amplitude, and increased the frequency at which the oscillating amplitude took the minimum. Fundamental mechanisms relevant to these characteristics of oscillation amplitude of discharge current from an AC driven hot cathode filament are discussed.

• OSTI ID: 22075728
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1496; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALTERNATING CURRENT
AMPLITUDES
CATHODES
ELECTRIC DISCHARGES
FLUCTUATIONS
ION SOURCES
KHZ RANGE
OSCILLATIONS
PLASMA
PLASMA DIAGNOSTICS
PLASMA FILAMENT
PLASMA WAVES
TUNGSTEN