TriWaSp: a multi-faceted visible spectroscopy diagnostic on the ST40 tokamak

Journal Article · Wed Mar 22 00:00:00 EDT 2023 · Journal of Instrumentation

DOI:https://doi.org/10.1088/1748-0221/18/03/c03023· OSTI ID:1986203

Willett, H. V. ^[1]; Osin, D. ^[1]; Naylor, G. ^[1]; Wood, J. ^[1]; Lomanowski, Bart ^[2]; Sertoli, M. ^[1]

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1. Tokamak Energy Ltd. (United Kingdom)
2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Here, we present a new state-of-the-art Triple Wavelength Spectrometer (TriWaSp), recently deployed on ST40, a high field low aspect ratio spherical tokamak. The TriWaSp has a range of possible applications due to its flexible design; the current configuration focuses on charge exchange recombination spectroscopy from carbon and neon impurities in the ST40 plasma. This paper discusses the detailed setup of the system and presents initial charge exchange ion temperature measurements using a single line of sight, which show good agreement with other ion temperature diagnostics. Building on these commissioning results and forward modelling of the system, a new observation geometry has been implemented for the next experimental campaign which will considerably improve the localisation of ion temperature and velocity profile measurements.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Contributing Organization: Princeton Plasma Physics Laboratory (PPPL)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1986203
• Journal Information: Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 03 Vol. 18; ISSN 1748-0221
• Publisher: Institute of Physics (IOP)
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
charged-particle spectroscopy
interferometry
spectrometers