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

Abstract

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.

Authors:
; ; ;  [1]
  1. Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)
Publication Date:
OSTI Identifier:
22075728
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1496; Journal Issue: 1; Conference: 19. international conference on ion implantation technology, Valladolid (Spain), 25-29 Jun 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Takahashi, Yuki, Miyamoto, Naoki, Kasuya, Toshiro, and Wada, Motoi. Oscillation phenomena of a plasma produced by an AC driven hot cathode. United States: N. p., 2012. Web. doi:10.1063/1.4766576.
Takahashi, Yuki, Miyamoto, Naoki, Kasuya, Toshiro, & Wada, Motoi. Oscillation phenomena of a plasma produced by an AC driven hot cathode. United States. doi:10.1063/1.4766576.
Takahashi, Yuki, Miyamoto, Naoki, Kasuya, Toshiro, and Wada, Motoi. Tue . "Oscillation phenomena of a plasma produced by an AC driven hot cathode". United States. doi:10.1063/1.4766576.
@article{osti_22075728,
title = {Oscillation phenomena of a plasma produced by an AC driven hot cathode},
author = {Takahashi, Yuki and Miyamoto, Naoki and Kasuya, Toshiro and Wada, Motoi},
abstractNote = {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.},
doi = {10.1063/1.4766576},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1496,
place = {United States},
year = {2012},
month = {11}
}