Short-pulse frequency stabilization of a MW-class ECRH gyrotron at W7-X for CTS diagnostic

Krier, L.; Avramidis, Konstantinos A.; Braune, H.; Gantenbein, G.; Illy, S.; Jelonnek, John; Laqua, H. P.; Marsen, S.; Moseev, D.; Noke, F.; Ruess, Tobias; Stange, T.; Thumm, M.; Wolf, R. C.

doi:10.1016/j.fusengdes.2023.113828

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…All heating gyrotrons are using 140 GHz, and gyrotron B1 was used as a CTS probe at 174 GHz, firing in 10 ms blips. The effects of the active frequency stabilization of gyrotron B1 [33] can be seen in Fig. 8(c), compensating the thermal expansion of the resonator after a few milliseconds of firing.…”

Section: Resultsmentioning

confidence: 99%

An Ultrafast Digitizer for Continuous Measurements from Microwave Fusion Diagnostics

Verdier,

Vann,

Jacobsen

et al. 2023

Preprint

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Section: Resultsmentioning

confidence: 99%

An Ultrafast Digitizer for Continuous Measurements from Microwave Fusion Diagnostics

Verdier,

Vann,

Jacobsen

et al. 2023

Preprint

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“…The prediction was proven experimentally. Additionally, we showed that the frequency drift of the high-power gyrotron could be stabilized [25] which allows CTS measurements with a narrow notch filter.…”

Section: Jinst 19 C03056mentioning

confidence: 95%

Commissioning and first results of the 174 GHz collective Thomson scattering diagnostic at Wendelstein 7-X

Moseev,

Ponomarenko,

Laqua

et al. 2024

J. Inst.

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Collective Thomson Scattering (CTS) diagnostics measure the scattering spectrum of monochromatic incident radiation off collective fluctuations in the plasma. In this contribution, we present the first results from the upgraded CTS diagnostic at Wendelstein 7-X (W7-X) operating in the frequency range between 172 and 176 GHz. This frequency range allows for minimization of noise originating from the electron cyclotron emission in the plasma. Consequently, the good signal-to-noise ratio allows measurements of fast ions or bulk plasma parameters with higher temporal resolution compared with the previously used 140 GHz system.

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An ultrafast digitizer for continuous measurements from microwave fusion diagnostics

Verdier,

Vann,

Jacobsen

et al. 2024

Fusion Engineering and Design

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Short-pulse frequency stabilization of a MW-class ECRH gyrotron at W7-X for CTS diagnostic

Cited by 6 publications

References 16 publications

An Ultrafast Digitizer for Continuous Measurements from Microwave Fusion Diagnostics

An Ultrafast Digitizer for Continuous Measurements from Microwave Fusion Diagnostics

Commissioning and first results of the 174 GHz collective Thomson scattering diagnostic at Wendelstein 7-X

An ultrafast digitizer for continuous measurements from microwave fusion diagnostics

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