Nd:YAG laser Thomson scattering diagnostics for a laboratory magnetosphere.
- Resource Type
- Academic Journal
- Authors
- Kenmochi N; Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.; Nishiura M; Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.; Yoshida Z; Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.; Yamada I; National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.; Funaba H; National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.; Sugata T; Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.; Nakamura K; Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.; Katsura S; Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
- Source
- Publisher: American Institute Of Physics Country of Publication: United States NLM ID: 0405571 Publication Model: Print Cited Medium: Internet ISSN: 1089-7623 (Electronic) Linking ISSN: 00346748 NLM ISO Abbreviation: Rev Sci Instrum Subsets: PubMed not MEDLINE
- Subject
- Language
- English
A new Nd:YAG laser Thomson scattering (TS) system has been developed to explore the mechanism of high-beta plasma formation in the RT-1 device. The TS system is designed to measure electron temperatures (T e ) from 10 eV to 50 keV and electron densities (n e ) of more than 1.0 × 10 17 m -3 . To measure at the low-density limit, the receiving optics views the long scattering length (60 mm) using a bright optical system with both a large collection window (260-mm diameter) and large collection lenses (300-mm diameter, a solid angle of ∼68 × 10 -3 str). The scattered light of the 1.2-J Nd:YAG laser (repetition frequency: 10 Hz) is detected with a scattering angle of 90° and is transferred via a set of lenses and an optical fiber bundle to a polychromator. After Raman scattering measurement for the optical alignment and an absolute calibration, we successfully measured T e = 72.2 eV and n e = 0.43 × 10 16 m -3 for the coil-supported case and T e = 79.2 eV and n e = 1.28 × 10 16 m -3 for the coil-levitated case near the inner edge in the magnetospheric plasmas.