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Title: VUV emission spectroscopy diagnostics of a 14 GHz ECR negative hydrogen ion source

Vacuum Ultra Violet(VUV) emission from a 4 cm diameter 2 cm long compact ion source excited by 14 GHz microwave has been investigated. Intensity ratio of band spectrum emission near Ly-α to Ly-α line spectrum is determined from the measured spectrum. which shows preferential excitation of molecules near the entrance of microwave input power. The ratio does not depend strongly upon pressure nor the input microwave power when the intensity is integrated over the volume of the plasma. The spatial distribution of the spectrum intensity ratio exhibits concentrations near microwave inlet and the opposite side where the microwave matching structure is located. The ratio at these peripheral regions is about two times as high as that of the central region. The ratio increased in proportion to the ion source pressure up to about 3.0 Pa, indicating efficient production of high energy electrons by ECR up to this pressure.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Graduate School of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0394 (Japan)
  2. Graduate School of Frontier Sciences The University of Tokyo, Kashiwara, Chiba 277-8561 (Japan)
  3. National lnstitute for Fusion Science, Toki, Gifu 509-5292 (Japan)
Publication Date:
OSTI Identifier:
22391467
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONCENTRATION RATIO; ELECTRON CYCLOTRON-RESONANCE; ELECTRONS; EMISSION SPECTRA; EMISSION SPECTROSCOPY; EXCITATION; FAR ULTRAVIOLET RADIATION; GHZ RANGE; HYDROGEN IONS 1 MINUS; ION SOURCES; LYMAN LINES; MICROWAVE RADIATION; MOLECULES; PHOTON EMISSION; PLASMA; SPATIAL DISTRIBUTION