TY - JOUR
T1 - 3D metal powder additive manufacturing phased array antenna for multichannel Doppler reflectometer
AU - Tokuzawa, T.
AU - Nasu, T.
AU - Inagaki, S.
AU - Moon, C.
AU - Ido, T.
AU - Idei, H.
AU - Ejiri, A.
AU - Imazawa, R.
AU - Yoshida, M.
AU - Oyama, N.
AU - Tanaka, K.
AU - Ida, K.
N1 - Funding Information:
The author expresses special thanks to Mr. T. Miyazaki of TKE Co., LTD. and Mr. Y. Sayama of DOHO Corporation for their assistance in the production of the 3D modeling. This work was supported, in part by, KAKENHI (Grant Nos. 19H01880 and 21H04973), a budgetary Grant-in-Aid from the NIFS LHD project under the auspices of the NIFS Collaboration Research Program (Grant No. ULPP027), and the collaboration programs of the RIAM of Kyushu University and the QST institute.
Publisher Copyright:
© 2022 Author(s).
PY - 2022/11/1
Y1 - 2022/11/1
N2 - Measuring the time variation of the wavenumber spectrum of turbulence is important for understanding the characteristics of high-temperature plasmas, and the application of a Doppler reflectometer with simultaneous multi-frequency sources is expected. To implement this diagnostic in future fusion devices, the use of a phased array antenna (PAA) that can scan microwave beams without moving antennas is recommended. Since the frequency-scanning waveguide leaky-wave antenna-type PAA has a complex structure, we have investigated its characteristics by modeling it with 3D metal powder additive manufacturing (AM). First, a single waveguide is fabricated to understand the characteristics of 3D AM techniques, and it is clear that there are differences in performance depending on the direction of manufacture and surface treatment. Then, a PAA is made, and it is confirmed that the beam can be emitted in any direction by frequency scanning. The plasma flow velocity can be measured by applying the 3D manufacturing PAA to plasma measurement.
AB - Measuring the time variation of the wavenumber spectrum of turbulence is important for understanding the characteristics of high-temperature plasmas, and the application of a Doppler reflectometer with simultaneous multi-frequency sources is expected. To implement this diagnostic in future fusion devices, the use of a phased array antenna (PAA) that can scan microwave beams without moving antennas is recommended. Since the frequency-scanning waveguide leaky-wave antenna-type PAA has a complex structure, we have investigated its characteristics by modeling it with 3D metal powder additive manufacturing (AM). First, a single waveguide is fabricated to understand the characteristics of 3D AM techniques, and it is clear that there are differences in performance depending on the direction of manufacture and surface treatment. Then, a PAA is made, and it is confirmed that the beam can be emitted in any direction by frequency scanning. The plasma flow velocity can be measured by applying the 3D manufacturing PAA to plasma measurement.
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U2 - 10.1063/5.0101723
DO - 10.1063/5.0101723
M3 - Review article
C2 - 36461436
AN - SCOPUS:85143352936
SN - 0034-6748
VL - 93
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 11
M1 - 113535
ER -