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research article

Gas puff imaging on the TCV tokamak

Offeddu, N.  
•
Wuethrich, C.  
•
Han, W.
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December 1, 2022
Review Of Scientific Instruments

We present the design and operation of a suite of Gas Puff Imaging (GPI) diagnostic systems installed on the Tokamak a Configuration Variable (TCV) for the study of turbulence in the plasma edge and Scrape-Off-Layer (SOL). These systems provide the unique ability to simultaneously collect poloidal 2D images of plasma dynamics at the outboard midplane, around the X-point, in both the High-Field Side (HFS) and Low-Field Side (LFS) SOL, and in the divertor region. We describe and characterize an innovative control system for deuterium and helium gas injection, which is becoming the default standard for the other gas injections at TCV. Extensive pre-design studies and the different detection systems are presented, including an array of avalanche photodiodes and a high-speed CMOS camera. First results with spatial and time resolutions of up to asymptotic to 2 mm and 0.5 mu s, respectively, are described, and future upgrades of the GPI diagnostics for TCV are discussed. (C) 2022 Author(s).

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Type
research article
DOI
10.1063/5.0126398
Web of Science ID

WOS:000893230900006

Author(s)
Offeddu, N.  
Wuethrich, C.  
Han, W.
Theiler, C.  
Golfinopoulos, T.
Terry, J. L.
Marmar, E.
Galperti, C.  
Andrebe, Y.  
Duval, B. P.  
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Date Issued

2022-12-01

Publisher

AIP Publishing

Published in
Review Of Scientific Instruments
Volume

93

Issue

12

Article Number

123504

Subjects

Instruments & Instrumentation

•

Physics, Applied

•

Instruments & Instrumentation

•

Physics

•

injection system

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edge plasma

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turbulence

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fusion

•

nstx

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
January 16, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/193732
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