Design and Test of the Fast Ferrite Tuner for ICRF Heating in EAST

Chen, Gen; Zhao, Yanping; Mao, Yuzhou; Yuan, Shuai; Zheng, Guodi; Zheng, Fang; He, Zhixiong; Yu, Shenglin

doi:10.13182/fst61-301

Cited by 11 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to achieve better real-time impedance matching, the integral design goal of the FT magnetic circuit is that the DC bias magnetic field is 2000 Gs and alternating magnetic field is ±400 Gs. With the aim of designing an effective magnetic circuit, the two identical E-type cores were adopted referenced to the design schemes of the magnetic circuit [17], so that the closed magnetic core was composed by relative openings of the core.…”

Section: Biasing Magnet Designmentioning

confidence: 99%

“…However, the traditional algorithm is no longer appropriate. In order to confirm the size parameter and excitation coil and provide the significant reference for the design scheme, the finite element method has been adopted to simulate the FT magnetic circuit [17].…”

Section: Simulation For Biasing Magnetic Circuit Optimizationmentioning

confidence: 99%

“…Due to the lack of a reliable formula to calculate the self-inductance, the simulation was carried out with ANSYS MAXWELL codes to optimize the exact ampere turns in consideration of the working frequency of the biasing magnetic field [19]. Finally, 150 A×25 turns was adopted for each coil, and the total self-inductance of four groups of coils is about 7 mH [17].…”

Section: Alternating Magnetic Circuit Designmentioning

confidence: 99%

See 2 more Smart Citations

Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST

Xu¹,

Song²,

Chen³

et al. 2017

Plasma Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Ion cyclotron range of frequency (ICRF) heating has been used in tokamaks as one of the most successful auxiliary heating tools and has been adopted in the EAST. However, the antenna load will fluctuate with the change of plasma parameters in the ICRF heating process. To ensure the steady operation of the ICRF heating system in the EAST, fast ferrite tuner (FFT) has been carried out to achieve real-time impedance matching. For the requirements of the FFT impedance matching system, the magnet system of the ferrite tuner (FT) was designed by numerical simulations and experimental analysis, where the biasing magnetic circuit and alternating magnetic circuit were the key researched parts of the ferrite magnet. The integral design goal of the FT magnetic circuit is that DC bias magnetic field is 2000 Gs and alternating magnetic field is ±400 Gs. In the FTT, E-type magnetic circuit was adopted. Ferrite material is NdFeB with a thickness of 30 mm by setting the working point of NdFeB, and the ampere turn of excitation coil is 25 through the theoretical calculation and simulation analysis. The coil inductance to generate alternating magnetic field is about 7 mH. Eddy-current effect has been analyzed, while the magnetic field distribution has been measured by a Hall probe in the medium plane of the biasing magnet. Finally, the test results show the good performance of the biasing magnet satisfying the design and operating requirements of the FFT.

show abstract

Section: Biasing Magnet Designmentioning

confidence: 99%

Section: Simulation For Biasing Magnetic Circuit Optimizationmentioning

confidence: 99%

Section: Alternating Magnetic Circuit Designmentioning

confidence: 99%

See 1 more Smart Citation

Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST

Xu¹,

Song²,

Chen³

et al. 2017

Plasma Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…To isolate the HF generators from the reflected power, at JET [5] and ASDEX Upgrade [6], a system using 3 dB hybrid couplers was successfully used. Many tokamak teams have studied and implemented matching systems that can be used in real time, including the internal conjugate-T system of impedance matching at WEST [7] and for ITER-like antenna at JET [5], the external conjugate-T impdance-matching system at JET [8,9], the liquid dielectric stubs at EAST [10] and LHD [11], and the TOKAMAKS ferrite tuners at Alcator C-Mod [12,13], EAST [14], and KSTAR [15].…”

Section: Introductionmentioning

confidence: 99%

System of ICR Heating of the Plasma at the TRT Tokamak

et al. 2021

View full text Add to dashboard Cite

“…As a result, if plasma loading changes rapidly or varies in a large range, the transmitter would be mismatched. Many groups have studied and implemented matching systems that can be used in real-time, including frequency modulation on JET [1], dielectric liquid stubs on EAST [2] and LHD [3], ferrite tuners on Alcator C-Mod [4], EAST [5] and KSTAR [6]. In this paper, we report the recent progress on the implementation and performance of real time fast matching system using ferrite tuners on the Alcator C-Mod tokamak.…”

Section: Introductionmentioning

confidence: 99%

ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak

Lin

Binus

Wukitch

et al. 2015

Fusion Engineering and Design

View full text Add to dashboard Cite

Real-time fast ferrite tuning (FFT) has been successfully implemented on the ICRF antennas on Alcator C-Mod. The former prototypical FFT system on the E-port 2-strap antenna has been upgraded using new ferrite tuners. A new FFT system with two ferrite tuners and one fixedlength stub has been installed on the transmission line of the D-port 2-strap antenna. These two systems are able to achieve and maintain the reflected power to the transmitters to less than 1% in real time under almost all plasma conditions and help ensure reliable high power operation of the antennas. The loading insensitivity feature vs. plasma conditions of the innovative fieldaligned (FA) 4-strap antenna on the J-port allows us to significantly improve the matching by installing a carefully designed stub on each of the two transmission lines. The reduction of the RF voltages in the transmission lines has enabled the J-port FA antenna to deliver 3.7 MW RF power to plasmas out of 4 MW source power. The matching on the J-port antenna can be further improved by adding a single ferrite tuner under real-time control on each transmission line and this scheme will be implemented in the near future.

show abstract

Design and Test of the Fast Ferrite Tuner for ICRF Heating in EAST

Cited by 11 publications

References 15 publications

Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST

Tunable biasing magnetic field design of ferrite tuner for ICRF heating system in EAST

System of ICR Heating of the Plasma at the TRT Tokamak

ICRF antenna matching systems with ferrite tuners for the Alcator C-Mod tokamak

Contact Info

Product

Resources

About