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RISS 인기검색어
- 검색키워드
- 저자 : Hillairet, Julien (검색결과 3 건)
- 무료
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Design and tests of 500kW RF windows for the ITER LHCD system
Hillairet, J.,Kim, J.,Faure, N.,Achard, J.,Bae, Y.S.,Bernard, J.M.,Delpech, L.,Goniche, M.,Larroque, S.,Magne, R.,Marfisi, L.,Park, S.,Poli, S.,Dechambre, N.,Vulliez, K. Elsevier 2015 Fusion engineering and design Vol.94 No.-
<P><B>Abstract</B></P> <P>In the frame of a R&D effort conducted by CEA towards the design and the qualification of a 5GHz LHCD system for the ITER tokamak, two 5GHz 500kW/5s windows have been designed, manufactured and tested at high power in collaboration with the National Fusion Research Institute (NFRI). The window design rely on a symmetrical pill-box concept with a cylindrical beryllium oxide ceramic brazed on an actively water cooled copper skirt. The ceramic RF properties have been measured on a test sample to get realistic values for guiding the design. Low power measurements of the manufactured windows show return losses below −32dB and insertion losses between −0.01dB and −0.05dB, with an optimum frequency shifted toward lower frequencies. High power tests conducted at NFRI show unexpected total power loss for both windows. The ceramic temperature during RF pulses has been found to reach unexpected high temperature, preventing these windows to be used under CW conditions. A post-mortem RF analysis of samples taken from one window shows that the dielectric properties of the ceramic were not the ones measured on the manufacturer sample, which partly explain the differences with the reference modelling.</P>
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Design of mid-plane passive active multijunction antenna for 5-GHz KSTAR LHCD system
Kim, Jeehyun,Wang, Sonjong,Hillairet, Julien,Wi, Hyunho,Seon, Sangwon,Han, Jongwon,Delpech, Lena Elsevier 2017 Fusion engineering and design Vol.123 No.-
<P><B>Abstract</B></P> <P>The major upgrade of KSTAR LHCD system to 4MW is planned in 2021. 4-MW RF power will be provided by 8×0.5MW klystrons. Highly oversized circular waveguide transmitting TE<SUB>01</SUB>° mode will be adopted for the low loss transmission line longer than 50m. The design of the 4-MW mid-plane Passive Active Multijunction launcher has been performed. Considering parallel refractive index N<SUB>||</SUB> for the efficient current drive and the maximum power density at the launcher mouth, the launcher is composed of 256 active waveguides whose dimension is 58mm x 7mm and 18mm of spatial period for N<SUB>||0</SUB> =2.5. Multijunction with E<SUB>max <</SUB> 3.5kV/cm and high power waveguide components have been designed using HFSS code. The antenna properties were evaluated using ALOHA. Prototype PAM launcher with 32 active waveguides is under development for 0.5-MW pulsed operation.</P>
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Kim, Hae Jin,Wang, Son Jong,Park, Byoung Ho,Kwak, Jong-Gu,Hillairet, Julien,Choi, Jin Joo Elsevier 2015 Fusion engineering and design Vol.96 No.-
<P><B>Abstract</B></P> <P>RF design and network analyzer tests of broadband, amplitude-balanced coaxial hybrid junctions are presented. We have designed two 3dB hybrid splitters with 9 and 12in. coaxial transmission lines applicable to ITER ICRF for load-resilient operations using ANSYS HFSS. Amplitude-balanced broadband responses were obtained with the combination of impedance reductions of longitudinal and transverse branches in unequal proportion, length change of 50Ω lines and diameter change of high impedance lines connected transversely to the T-section of the hybrid splitter, respectively. We have fabricated and RF tested the 9in. coaxial hybrid coupler. We obtained an excellent coupling flatness of −3.2±0.2dB, phase difference of 4 degrees and return loss of 16dB in 40–55MHz. The measured data of 9in. hybrid splitter is highly consistent with HFSS simulations. We found that the proposed 3dB hybrid splitter can be tunable with amplitude-balanced, broadband response by changing dielectric insulators to keep the inner and outer conductors of coaxial line apart. The proposed 3dB hybrid splitter can be utilized for load-resilient operations in a wide range of antenna load variations due to mode transitions or edge localized modes (ELMs) in fusion plasmas.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amplitude balanced 3dB coaxial hybrid splitter has been designed and rf tested. </LI> <LI> The proposed hybrid is applicable to ITER ICRF transmission line for load resilience. </LI> <LI> Two-section, broadband coaxial hybrid can be tunable by changing dielectric insulator. </LI> </UL> </P>
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