Real-time data processing and magnetic field pitch angle estimation of the JET motional Stark effect diagnostic based on Kalman filtering

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3117610· OSTI ID:22053584

Coelho, R; Alves, D ^[1]; Hawkes, N; Brix, M ^[2]

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1. Instituto de Plasmas e Fusao Nuclear, Associacao Euratom/IST, 1049-001 Lisboa (Portugal)
2. Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon, OX14 3DB (United Kingdom)

A novel technique for the real-time measurement of the magnetic field pitch angle in JET discharges using the motional Stark effect diagnostic is presented. Kalman filtering techniques are adopted to estimate the amplitude of the avalanche photodiode signals' harmonics that are relevant for the pitch angle calculation. The proposed technique {l_brace}for extended technical details of the generic algorithm see [R. Coelho and D. Alves, IEEE Trans. Plasma Sci. 37, 164 (2009)]{r_brace} is shown to be much more robust and provides less noisy estimates than an equivalent lock-in amplifier scheme, in particular when dealing with edge localized modes.

• OSTI ID: 22053584
• Journal Information: Review of Scientific Instruments, Vol. 80, Issue 6; Other Information: (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALGORITHMS
DATA PROCESSING
EDGE LOCALIZED MODES
ELECTRIC DISCHARGES
INCLINATION
JET TOKAMAK
LOCK-IN AMPLIFIERS
MAGNETIC FIELDS
PHOTODIODES
SIGNALS
STARK EFFECT
TIME MEASUREMENT