The circuit of polychromator for Experimental Advanced Superconducting Tokamak edge Thomson scattering diagnostic

The detector circuit is the core component of filter polychromator which is used for scattering light analysis in Thomson scattering diagnostic, and is responsible for the precision and stability of a system. High signal-to-noise and stability are primary requirements for the diagnostic. Recently, a...

Full description

Saved in:
Bibliographic Details
Published in:Review of scientific instruments 2013-09, Vol.84 (9), p.093504-093504
Main Authors: Zang, Qing, Hsieh, C L, Zhao, Junyu, Chen, Hui, Li, Fengjuan
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
AMBIENT TEMPERATURE
ELECTRON DENSITY
ELECTRON TEMPERATURE
HT-7U TOKAMAK
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LIGHT SCATTERING
OPTICAL FILTERS
PHOTODIODES
PHOTONS
PLASMA DIAGNOSTICS
READOUT SYSTEMS
SIGNAL-TO-NOISE RATIO
SIGNALS
TEMPERATURE MEASUREMENT
THOMSON SCATTERING
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The detector circuit is the core component of filter polychromator which is used for scattering light analysis in Thomson scattering diagnostic, and is responsible for the precision and stability of a system. High signal-to-noise and stability are primary requirements for the diagnostic. Recently, an upgraded detector circuit for weak light detecting in Experimental Advanced Superconducting Tokamak (EAST) edge Thomson scattering system has been designed, which can be used for the measurement of large electron temperature (T(e)) gradient and low electron density (n(e)). In this new circuit, a thermoelectric-cooled avalanche photodiode with the aid circuit is involved for increasing stability and enhancing signal-to-noise ratio (SNR), especially the circuit will never be influenced by ambient temperature. These features are expected to improve the accuracy of EAST Thomson diagnostic dramatically. Related mechanical construction of the circuit is redesigned as well for heat-sinking and installation. All parameters are optimized, and SNR is dramatically improved. The number of minimum detectable photons is only 10.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4820561