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Optimization of the Collective Thomson scattering diagnostic for future operation

Abramovic, I. ; Moseev, D. ; Stange, T. ; Marsen, S. ; Kasparek, W. ; Nielsen, S.K. ; Tancetti, A. ; Salewski, M. ; Pavone, A. ; Svensson, J. ; Wolf, R.C. ; Laqua, H.P. ; Cardozo, N.J. Lopes

Journal of instrumentation, 2019-10, Vol.14 (10), p.C10021-C10021 [Periódico revisado por pares]

Bristol: IOP Publishing

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Título:
Optimization of the Collective Thomson scattering diagnostic for future operation
Autor: Abramovic, I. ; Moseev, D. ; Stange, T. ; Marsen, S. ; Kasparek, W. ; Nielsen, S.K. ; Tancetti, A. ; Salewski, M. ; Pavone, A. ; Svensson, J. ; Wolf, R.C. ; Laqua, H.P. ; Cardozo, N.J. Lopes
Assuntos: Bayesian analysis ; Diagnostic systems ; Distribution functions ; Ion temperature ; Ion velocity ; Notch filters ; Optimization ; Parameters ; Plasma ; Plasma composition ; Spectra ; Statistical inference ; Thomson scattering ; Velocity distribution
É parte de: Journal of instrumentation, 2019-10, Vol.14 (10), p.C10021-C10021
Descrição: Collective Thomson scattering (CTS) is a microwave diagnostic allowing measurements of a number of plasma parameters such as the bulk ion temperature, the plasma composition, drift velocities and fast ion velocity distribution function. A CTS system has been successfully installed and commissioned on the Wendelstein 7-X (W7-X) stellarator. The measured spectra are analyzed by the means of the CTS forward model eCTS and the Minerva scientific framework enabling the use of Bayesian inference of relevant plasma parameters. Here we discuss the options for further optimization of the CTS diagnostic and focus on two topics of importance for the inference of bulk ion temperature values from CTS spectra: influence of impurities on the CTS spectra and the width of the notch filters that are employed to protect the receiver from high-power radiation. In addition to that we discuss the possibility of effective charge measurements by CTS. We explore the existence of an optimal notch filter width.
Editor: Bristol: IOP Publishing
Idioma: Inglês

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Optimization of the Collective Thomson scattering diagnostic for future operation

Abramovic, I. ; Moseev, D. ; Stange, T. ; Marsen, S. ; Kasparek, W. ; Nielsen, S.K. ; Tancetti, A. ; Salewski, M. ; Pavone, A. ; Svensson, J. ; Wolf, R.C. ; Laqua, H.P. ; Cardozo, N.J. Lopes

Bristol: IOP Publishing

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