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Title: Measurement of spatial and temporal behavior of H{sub α} emission from Aditya tokamak using a diagnostic based on a photomultiplier tube array

A photo multiplier tube (PMT) array based spectroscopic diagnostic with fast time response of 10 μs and spatial resolution ∼3 cm has been developed and installed on Aditya tokamak to study the spatial and temporal behavior of H{sub α} emissions from typical discharges. Collimated light has been collected from the plasma along 16 lines of sight passing through entire plasma poloidal cross section of Aditya and detected by two 8 channels PMT arrays after selecting H{sub α} emission using interference filter. The studies are carried out during plasma formation phase of Aditya by changing vertical field and its delay with respect to loop voltage. It is observed that plasma initiated in the high field side in typical discharges of Aditya. The plasma formation position is matched with null field location estimated through simulation.
Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1] ;  [2]
  1. Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382 428 (India)
  2. Metallurgical Engineering and Material Science Department, Indian Institute of Technology Bombay, Powai, Mumbai 400 076 (India)
Publication Date:
OSTI Identifier:
22308944
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ADITYA TOKAMAK; BALMER LINES; CROSS SECTIONS; ELECTRIC POTENTIAL; ELECTRON MULTIPLIERS; INTERFERENCE; PHOTOMULTIPLIERS; PLASMA; SIMULATION; SPATIAL RESOLUTION; VISIBLE RADIATION