Implementation of a multichannel soft x-ray diagnostic for electron temperature measurements in TJ-II high-density plasmas
- Associacao EURATOM/IST, Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, 1049-001 Lisboa (Portugal)
- Laboratorio Nacional de Fusion, Asociacion EURATOM-CIEMAT, 28040 Madrid (Spain)
- Laboratorio General de Electronica y Automatica-CIEMAT, 28040 Madrid (Spain)
Based on the multi-foil technique, a multichannel soft x-ray diagnostic for electron temperature measurements has been recently implemented in the TJ-II stellarator. The diagnostic system is composed by four photodiodes arrays with beryllium filters of different thickness. An in-vacuum amplifier board is coupled to each array, aiming at preventing induced noise currents. The Thomson scattering and the vacuum ultraviolet survey diagnostics are used for assessing plasma profiles and composition, being the analysis carried out with the radiation code IONEQ. The electron temperature is determined through the different signal-pair ratios with temporal and spatial resolution. The design and preliminary results from the diagnostic are presented.
- OSTI ID:
- 22093890
- Journal Information:
- Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMPLIFIERS
BERYLLIUM
ELECTRON TEMPERATURE
FOILS
ION TEMPERATURE
NOISE
PHOTODIODES
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA RADIAL PROFILES
PLASMA SIMULATION
SIGNALS
SOFT X RADIATION
SPATIAL RESOLUTION
STELLARATORS
THICKNESS
THOMSON SCATTERING
ULTRAVIOLET RADIATION