Stray light analysis for the Thomson scattering diagnostic of the ETE Tokamak

Journal Article · Wed Dec 15 00:00:00 EST 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3505485· OSTI ID:22062215

Berni, L A ^[1]; Albuquerque, B F. C. ^[2]

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1. Instituto Nacional de Pesquisas Espaciais (INPE), Laboratorio Associado de Sensores e Materiais (LAS), 12.227-010 Sao Jose dos Campos, SP (Brazil)
2. Instituto Nacional de Pesquisas Espaciais (INPE), Engenharia e Tecnologia Espaciais, Divisao de Eletronica Aeroespacial, 12.227-010 Sao Jose dos Campos, SP (Brazil)

Thomson scattering is a well-established diagnostic for measuring local electron temperature and density in fusion plasma, but this technique is particularly difficult to implement due to stray light that can easily mask the scattered signal from plasma. To mitigate this problem in the multipoint Thomson scattering system implemented at the ETE (Experimento Tokamak Esferico) a detailed stray light analysis was performed. The diagnostic system was simulated in ZEMAX software and scattering profiles of the mechanical parts were measured in the laboratory in order to have near realistic results. From simulation, it was possible to identify the main points that contribute to the stray signals and changes in the dump were implemented reducing the stray light signals up to 60 times.

• OSTI ID: 22062215
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 12; 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
COMPUTER CODES
COMPUTERIZED SIMULATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
LIGHT SCATTERING
PLASMA
STRAY RADIATION
TEMPERATURE MEASUREMENT
THOMSON SCATTERING
TOKAMAK DEVICES
VISIBLE RADIATION