High power test of wideband polarizer for electron cyclotron current driving system in JT-60SA

Horie, Naoyuki; Omori, Kohei; Omori, Atsushi; Saigusa, M.; Kobayashi, Takayuki; Moriyama, S.; Arata, Hiroshi; Uno, Tsuyoshi

doi:10.1016/j.fusengdes.2017.08.013

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…The above corrugation geometry is the same as those for the waveguide in JT-60U and DIII-D at the waveguide inner diameter of 31.75 mm [28]. The detail of the transmission line design and tests are shown in references [29,30]. Even with the low HE 11 purity at 138 GHz, the transmission loss at 138 GHz was comparable to the one at 110 GHz [29].…”

Section: Initial Tests With a Previous Moumentioning

confidence: 99%

Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA

Kobayashi¹,

Yamazaki²,

Hiranai³

et al. 2022

Nucl. Fusion

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A gyrotron and a matching optics unit (MOU) for the multi-frequency electron cyclotron heating and current drive (ECH/CD) system in JT-60SA have been developed successfully. The gyrotron demonstrated stable operation at high powers of 1.5 MW for 5 s and 1.9 MW for 1 s at 110 GHz. To obtain high HE11 mode purity (> 90%) at the outlet of the waveguide in the ECH/CD launcher, a MOU for operating at three frequencies of 82 GHz, 110 GHz, and 138 GHz that includes three pairs of water-cooled phase correcting mirrors has been developed, which allows the mirrors to be changed without opening the evacuated MOU. The mode purity at the inlet of a dummy load in the transmission line was evaluated at high-power and an HE11 mode purity of > 90% was obtained at three frequencies.

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Section: Initial Tests With a Previous Moumentioning

confidence: 99%

Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA

Kobayashi¹,

Yamazaki²,

Hiranai³

et al. 2022

Nucl. Fusion

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show abstract

Evaluation of transmission efficiency of the ECH/CD transmission lines in integrated commissioning phase on JT-60SA

Yamazaki,

Kobayashi,

Takahashi

et al. 2023

Fusion Engineering and Design

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Synthesis of two quasi-optical polarizers for the multi-frequency high-power millimeter wave system

Chen

Xia

et al. 2022

Review of Scientific Instruments

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Millimeter wave systems based on powerful gyrotron can deliver megawatt microwave power, which is an important auxiliary heating method for magnetic confinement fusion devices. Reflective gratings are normally used as quasi-optical polarizers for polarization control of the wave in such systems. Based on the coordinate transformation method, we developed a numerical code to study the broadband polarization strategy. By considering the synthesis of two polarizers, we designed a pair of polarizers in the W band. Calculation results indicated that almost arbitrary polarization can be achieved in a wide frequency range. To verify the design, we set up a low-power test platform and experiments were carried out. The performance of the polarizers was tested from 80 to 105 GHz with a step of 5 GHz. The test results agreed well with the numerical results, indicating that the design is reasonable. With the development of multi-frequency gyrotrons, the study in this paper can be used as a reference for the design of broadband polarizers of multi-frequency millimeter wave systems.

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High power test of wideband polarizer for electron cyclotron current driving system in JT-60SA

Cited by 4 publications

References 8 publications

Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA

Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA

Evaluation of transmission efficiency of the ECH/CD transmission lines in integrated commissioning phase on JT-60SA

Synthesis of two quasi-optical polarizers for the multi-frequency high-power millimeter wave system

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