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Title: Design of multipulse Thomson scattering diagnostic for SST-1 tokamak

Abstract

A multipulse Nd:YAG (Yttrium aluminum garnet) Thomson scattering (TS) system is designed and developed for measuring electron temperature (T{sub e}) and density (n{sub e}) profiles of SST-1 tokamak. The system operates at vertical, divertor, and horizontal (midplane) regions of plasma and measures the electron temperature of 20 eV to 1.5 keV and density of 10{sup 18}-10{sup 19} m{sup -3}. Six Nd:YAG lasers synchronized with external control is used to get three different temporal resolutions (30 Hz, 180 Hz, and 1 kHz). The entire system is laboratory tested for the stability of alignment and performance over a distance of 30 m. Different imaging lens assemblies are designed to image the scattered photons from each of the scattering region to an array of optical fibers. A low cost and compact five-channel interference filter polychromator is designed, fabricated, and tested for its image quality and the filter transmission characteristics. Detection system with an avalanche photodiode and required signal conditioning electronics is developed for detecting the scattered photons. A data acquisition and control module operating on PXI bus is developed for the real time data acquisition and system control. A detailed description of design and testing of TS subsystems is presented in this article.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Institute For Plasma Research, Bhat, Gandhinagar 382 428 (India)
Publication Date:
OSTI Identifier:
20953420
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 4; Other Information: DOI: 10.1063/1.2724775; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; ALUMINIUM OXIDES; DATA ACQUISITION; DENSITY; DESIGN; ELECTRON TEMPERATURE; FERRITE GARNETS; FILTERS; INTERFERENCE; ION TEMPERATURE; OPTICAL FIBERS; PHOTODIODES; PHOTONS; PLASMA; THOMSON SCATTERING; TOKAMAK DEVICES; YTTRIUM; YTTRIUM COMPOUNDS

Citation Formats

Kumar, Ajai, Chavda, Chhaya, Saxena, Y. C., Singh, Ranjeet, Thakar, Aruna, Thomas, Jinto, Patel, Kiran, Pandya, Kaushal, and Bedakihale, Vijay. Design of multipulse Thomson scattering diagnostic for SST-1 tokamak. United States: N. p., 2007. Web. doi:10.1063/1.2724775.
Kumar, Ajai, Chavda, Chhaya, Saxena, Y. C., Singh, Ranjeet, Thakar, Aruna, Thomas, Jinto, Patel, Kiran, Pandya, Kaushal, & Bedakihale, Vijay. Design of multipulse Thomson scattering diagnostic for SST-1 tokamak. United States. doi:10.1063/1.2724775.
Kumar, Ajai, Chavda, Chhaya, Saxena, Y. C., Singh, Ranjeet, Thakar, Aruna, Thomas, Jinto, Patel, Kiran, Pandya, Kaushal, and Bedakihale, Vijay. Sun . "Design of multipulse Thomson scattering diagnostic for SST-1 tokamak". United States. doi:10.1063/1.2724775.
@article{osti_20953420,
title = {Design of multipulse Thomson scattering diagnostic for SST-1 tokamak},
author = {Kumar, Ajai and Chavda, Chhaya and Saxena, Y. C. and Singh, Ranjeet and Thakar, Aruna and Thomas, Jinto and Patel, Kiran and Pandya, Kaushal and Bedakihale, Vijay},
abstractNote = {A multipulse Nd:YAG (Yttrium aluminum garnet) Thomson scattering (TS) system is designed and developed for measuring electron temperature (T{sub e}) and density (n{sub e}) profiles of SST-1 tokamak. The system operates at vertical, divertor, and horizontal (midplane) regions of plasma and measures the electron temperature of 20 eV to 1.5 keV and density of 10{sup 18}-10{sup 19} m{sup -3}. Six Nd:YAG lasers synchronized with external control is used to get three different temporal resolutions (30 Hz, 180 Hz, and 1 kHz). The entire system is laboratory tested for the stability of alignment and performance over a distance of 30 m. Different imaging lens assemblies are designed to image the scattered photons from each of the scattering region to an array of optical fibers. A low cost and compact five-channel interference filter polychromator is designed, fabricated, and tested for its image quality and the filter transmission characteristics. Detection system with an avalanche photodiode and required signal conditioning electronics is developed for detecting the scattered photons. A data acquisition and control module operating on PXI bus is developed for the real time data acquisition and system control. A detailed description of design and testing of TS subsystems is presented in this article.},
doi = {10.1063/1.2724775},
journal = {Review of Scientific Instruments},
number = 4,
volume = 78,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}