Design of a new high repetition rate Nd:YAG Thomson scattering system for Heliotron J

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3496977· OSTI ID:22055790

Minami, Takashi; Kobayashi, Shinji; Mizuuchi, Touru; Takeuchi, Masaki; Yamamoto, Satoshi; Okada, Hiroyuki; Nagasaki, Kazunobu; Nakamura, Yuji; Hanatani, Kiyoshi; Konoshima, Shigeru; Sano, Fumimichi ^[1]; Yashiro, Hiroaki ^[2]; Ohshima, Shinsuke ^[3]

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1. Institute of Advancaed Energy, Kyoto University, Gokasho, Uji 611-0011 (Japan)
2. Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011 (Japan)
3. Pioneering Research Unit for Next Generation, Kyoto University, Gokasho, Uji 611-0011 (Japan)

A new high repetition rate Nd:YAG Thomson scattering system has been designed for the Heliotron J helical device. The main purpose of installing the new Thomson scattering system is an investigation of an improved confinement physics such as the edge transport barrier (H-mode) or the internal transport barrier of the helical plasma. The system has 25 spatial points with {approx}10 mm resolution. Two high repetition Nd:YAG lasers (>550 mJ at 50 Hz) realize the measurement of the time evolution of the plasma profile with 10 ms time interval. Scattered light is collected with a large concave mirror (D=800 mm, f/2.25) with a solid angle of {approx}100 msr. The laser beam is injected from obliquely downward to upward, and obliquely backscattered light is detected (scattering angle is 20 deg.). Model simulation of the polychromator shows the measurable electron temperature and density range are from10 eV to 10 keV, >5x10{sup 18} m{sup -3} within 3% error for the temperature measurement, respectively.

• OSTI ID: 22055790
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRON DENSITY
ELECTRON TEMPERATURE
ERRORS
EV RANGE
HELIOTRON
H-MODE PLASMA CONFINEMENT
KEV RANGE
LIGHT SCATTERING
NEODYMIUM LASERS
PHOTON BEAMS
PLASMA RADIAL PROFILES
PLASMA SIMULATION
RESOLUTION
TEMPERATURE MEASUREMENT
THOMSON SCATTERING