Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X

S. Ponomarenko; D. Moseev; T. Stange; L. Krier; P. Stordiau; H. Braune; G Gantenbein; J. Jelonnek; A. Kuleshov; H. P. Laqua; C. Lechte; S. Marsen; S. K. Nielsen; J. W. Oosterbeek; B. Plaum; R. Ragona; J. Rasmussen; T. Ruess; M Salewski; M. Thumm; J. Zimmermann; W7-X Team

doi:10.1063/5.0174444

Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X

S. Ponomarenko^*, D. Moseev, T. Stange, L. Krier, P. Stordiau, H. Braune, G Gantenbein, J. Jelonnek, A. Kuleshov, H. P. Laqua, C. Lechte, S. Marsen, S. K. Nielsen, J. W. Oosterbeek, B. Plaum, R. Ragona, J. Rasmussen, T. Ruess, M Salewski, M. ThummJ. Zimmermann, W7-X Team

^*Corresponding author for this work

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Abstract

In this paper, we present the design and commissioning results of the upgraded collective Thomson scattering diagnostic at the Wendelstein 7-X stellarator. The diagnostic has a new radiometer designed to operate between the second and third harmonics of the electron cyclotron emission from the plasma at 171-177 GHz, where the emission background has a minimum and is of order 10-100 eV. It allows us to receive the scattered electromagnetic field with a significantly improved signal-to-noise ratio and extends the set of possible scattering geometries compared to the case of the original instrument operated at 140 GHz. The elements of the diagnostic are a narrowband notch filter and a frequency stabilized probing gyrotron that will allow measuring scattered radiation spectra very close to the probing frequency. Here, we characterize the microwave components applied to the radiometer and demonstrate the performance of the complete system that was achieved during the latest experimental campaign, OP2.1.

Original language	English
Article number	013501
Journal	Review of Scientific Instruments
Volume	95
Issue number	1
Number of pages	11
ISSN	0034-6748
DOIs	https://doi.org/10.1063/5.0174444
Publication status	Published - 2024

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Ponomarenko, S., Moseev, D., Stange, T., Krier, L., Stordiau, P., Braune, H., Gantenbein, G., Jelonnek, J., Kuleshov, A., Laqua, H. P., Lechte, C., Marsen, S., Nielsen, S. K., Oosterbeek, J. W., Plaum, B., Ragona, R., Rasmussen, J., Ruess, T., Salewski, M., ... W7-X Team (2024). Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X. Review of Scientific Instruments, 95(1), Article 013501. https://doi.org/10.1063/5.0174444

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title = "Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X",

abstract = "In this paper, we present the design and commissioning results of the upgraded collective Thomson scattering diagnostic at the Wendelstein 7-X stellarator. The diagnostic has a new radiometer designed to operate between the second and third harmonics of the electron cyclotron emission from the plasma at 171-177 GHz, where the emission background has a minimum and is of order 10-100 eV. It allows us to receive the scattered electromagnetic field with a significantly improved signal-to-noise ratio and extends the set of possible scattering geometries compared to the case of the original instrument operated at 140 GHz. The elements of the diagnostic are a narrowband notch filter and a frequency stabilized probing gyrotron that will allow measuring scattered radiation spectra very close to the probing frequency. Here, we characterize the microwave components applied to the radiometer and demonstrate the performance of the complete system that was achieved during the latest experimental campaign, OP2.1.",

author = "S. Ponomarenko and D. Moseev and T. Stange and L. Krier and P. Stordiau and H. Braune and G Gantenbein and J. Jelonnek and A. Kuleshov and Laqua, {H. P.} and C. Lechte and S. Marsen and Nielsen, {S. K.} and Oosterbeek, {J. W.} and B. Plaum and R. Ragona and J. Rasmussen and T. Ruess and M Salewski and M. Thumm and J. Zimmermann and {W7-X Team}",

year = "2024",

doi = "10.1063/5.0174444",

language = "English",

volume = "95",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

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Ponomarenko, S, Moseev, D, Stange, T, Krier, L, Stordiau, P, Braune, H, Gantenbein, G, Jelonnek, J, Kuleshov, A, Laqua, HP, Lechte, C, Marsen, S, Nielsen, SK, Oosterbeek, JW, Plaum, B, Ragona, R , Rasmussen, J, Ruess, T, Salewski, M, Thumm, M, Zimmermann, J & W7-X Team 2024, 'Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X', Review of Scientific Instruments, vol. 95, no. 1, 013501. https://doi.org/10.1063/5.0174444

TY - JOUR

T1 - Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X

AU - Ponomarenko, S.

AU - Moseev, D.

AU - Stange, T.

AU - Krier, L.

AU - Stordiau, P.

AU - Braune, H.

AU - Gantenbein, G

AU - Jelonnek, J.

AU - Kuleshov, A.

AU - Laqua, H. P.

AU - Lechte, C.

AU - Marsen, S.

AU - Nielsen, S. K.

AU - Oosterbeek, J. W.

AU - Plaum, B.

AU - Ragona, R.

AU - Rasmussen, J.

AU - Ruess, T.

AU - Salewski, M

AU - Thumm, M.

AU - Zimmermann, J.

AU - W7-X Team

PY - 2024

Y1 - 2024

N2 - In this paper, we present the design and commissioning results of the upgraded collective Thomson scattering diagnostic at the Wendelstein 7-X stellarator. The diagnostic has a new radiometer designed to operate between the second and third harmonics of the electron cyclotron emission from the plasma at 171-177 GHz, where the emission background has a minimum and is of order 10-100 eV. It allows us to receive the scattered electromagnetic field with a significantly improved signal-to-noise ratio and extends the set of possible scattering geometries compared to the case of the original instrument operated at 140 GHz. The elements of the diagnostic are a narrowband notch filter and a frequency stabilized probing gyrotron that will allow measuring scattered radiation spectra very close to the probing frequency. Here, we characterize the microwave components applied to the radiometer and demonstrate the performance of the complete system that was achieved during the latest experimental campaign, OP2.1.

AB - In this paper, we present the design and commissioning results of the upgraded collective Thomson scattering diagnostic at the Wendelstein 7-X stellarator. The diagnostic has a new radiometer designed to operate between the second and third harmonics of the electron cyclotron emission from the plasma at 171-177 GHz, where the emission background has a minimum and is of order 10-100 eV. It allows us to receive the scattered electromagnetic field with a significantly improved signal-to-noise ratio and extends the set of possible scattering geometries compared to the case of the original instrument operated at 140 GHz. The elements of the diagnostic are a narrowband notch filter and a frequency stabilized probing gyrotron that will allow measuring scattered radiation spectra very close to the probing frequency. Here, we characterize the microwave components applied to the radiometer and demonstrate the performance of the complete system that was achieved during the latest experimental campaign, OP2.1.

U2 - 10.1063/5.0174444

DO - 10.1063/5.0174444

M3 - Journal article

C2 - 38180346

SN - 0034-6748

VL - 95

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 1

M1 - 013501

ER -

Development of the 174 GHz collective Thomson scattering diagnostics at Wendelstein 7-X

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