Optimization of the Collective Thomson scattering diagnostic for future operation

W7-X Team; I. Abramovic; D. Moseev; T. Stange; S. Marsen; W. Kasparek; S.K. Nielsen; A. Tancetti; M. Salewski; A. Pavone; J. P. Svensson; R.C. Wolf; H.P. Laqua; N.J. Lopes Cardozo

doi:10.1088/1748-0221/14/10/C10021

Optimization of the Collective Thomson scattering diagnostic for future operation

W7-X Team, I. Abramovic^*, D. Moseev, T. Stange, S. Marsen, W. Kasparek, S.K. Nielsen, A. Tancetti, M. Salewski, A. Pavone, J. P. Svensson, R.C. Wolf, H.P. Laqua, N.J. Lopes Cardozo

^*Corresponding author for this work

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Abstract

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.

Original language	English
Article number	C10021
Journal	Journal of Instrumentation
Volume	14
Issue number	10
Number of pages	7
ISSN	1748-0221
DOIs	https://doi.org/10.1088/1748-0221/14/10/C10021
Publication status	Published - 2019
Event	3rd European Conference on Plasma Diagnostics - Lisbon, Portugal Duration: 6 May 2019 → 10 May 2019 Conference number: 3

Conference

Conference	3rd European Conference on Plasma Diagnostics
Number	3
Country/Territory	Portugal
City	Lisbon
Period	06/05/2019 → 10/05/2019

Keywords

Nuclear instruments and methods for hot plasma diagnostics
Analysis and statistical methods

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W7-X Team, Abramovic, I., Moseev, D., Stange, T., Marsen, S., Kasparek, W., Nielsen, S. K., Tancetti, A., Salewski, M., Pavone, A., Svensson, J. P., Wolf, R. C., Laqua, H. P., & Cardozo, N. J. L. (2019). Optimization of the Collective Thomson scattering diagnostic for future operation. Journal of Instrumentation, 14(10), Article C10021. https://doi.org/10.1088/1748-0221/14/10/C10021

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abstract = "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.",

keywords = "Nuclear instruments and methods for hot plasma diagnostics, Analysis and statistical methods",

author = "{W7-X Team} and I. Abramovic and D. Moseev and T. Stange and S. Marsen and W. Kasparek and S.K. Nielsen and A. Tancetti and M. Salewski and A. Pavone and Svensson, {J. P.} and R.C. Wolf and H.P. Laqua and Cardozo, {N.J. Lopes}",

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doi = "10.1088/1748-0221/14/10/C10021",

language = "English",

volume = "14",

journal = "Journal of Instrumentation",

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AU - W7-X Team

AU - Abramovic, I.

AU - Moseev, D.

AU - Stange, T.

AU - Marsen, S.

AU - Kasparek, W.

AU - Nielsen, S.K.

AU - Tancetti, A.

AU - Salewski, M.

AU - Pavone, A.

AU - Svensson, J. P.

AU - Wolf, R.C.

AU - Laqua, H.P.

AU - Cardozo, N.J. Lopes

N1 - Conference code: 3

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Nuclear instruments and methods for hot plasma diagnostics

KW - Analysis and statistical methods

U2 - 10.1088/1748-0221/14/10/C10021

DO - 10.1088/1748-0221/14/10/C10021

M3 - Conference article

SN - 1748-0221

VL - 14

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 10

M1 - C10021

T2 - 3rd European Conference on Plasma Diagnostics

Y2 - 6 May 2019 through 10 May 2019

ER -

Optimization of the Collective Thomson scattering diagnostic for future operation

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Conference

Keywords

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