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

Journal Article · Wed Apr 08 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4916488· OSTI ID:22391467

Ichikawa, T.; Kasuya, T.; Wada, M. ^[1]; Nishiura, M. ^[2]; Shimozuma, T. ^[3]

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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)

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.

• OSTI ID: 22391467
• Journal Information: AIP Conference Proceedings, Vol. 1655, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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