A5026946137- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Microwave Engineering and Waveguides
- Laser-Plasma Interactions and Diagnostics
- Electromagnetic Simulation and Numerical Methods
- Optical Coatings and Gratings
- Physics of Superconductivity and Magnetism
- Pulsed Power Technology Applications
- Electromagnetic Launch and Propulsion Technology
Institute of Plasma Physics
2014-2023
Chinese Academy of Sciences
2014-2023
Hefei Institutes of Physical Science
2021-2023
University of Science and Technology of China
2014-2015
A long pulse electron cyclotron resonance heating (ECRH) system has been developed to meet the requirements of steady-state operation for EAST superconducting tokamak, and first EC wave was successfully injected into plasma during 2015 spring campaign. The is mainly composed four 140 GHz gyrotron systems, 4 ITER-Like transmission lines, independent channel launchers corresponding power supplies, a water cooling, control & inter-lock etc. Each expected deliver maximum 1 MW be operated at...
Abstract This paper presents the progress in long—pulse operation of electron cyclotron (EC) system and achievements high—electron temperature plasmas by combined EC lower hybrid (LH) waves heating since was built 2015. An up to 12 keV with a duration over 100 s realized simultaneous LH at line-averaged density <?CDATA ${\bar n_{\text{e}}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mover> <mml:mi>n</mml:mi> <mml:mo>ˉ</mml:mo>...
A 140GHz electron cyclotron resonance heating and current drive (EC H&CD) project for EAST Tokamak is launched in 2011 with a total power of 4MW pulse length 100 s. The main objectives the system are to provide central H&CD, assist start-up control MHD activities. comprises four gyrotrons each nominal output 1MW at 140GHz. RF power, transmitted through evacuated corrugated waveguides will be injected into plasma from low field side (radial port). front steering equatorial launcher directs...
This paper presents a stable millimeter-wave power monitoring system for ECRH on EAST tokamak. The real-time was realized based monitor miter bends. "Exchange"method proposed to the reflection RF protection. A cRIO-based signal process unit designed, it is robust and has response time of 1 μs. tested experimental results were discussed.
A study of coupling characteristic between circular corrugated waveguide and rectangular smooth has been presented in this paper, which aims to develop a directional coupler integrated into miter bend for an electron cyclotron resonance heating system on EAST. The performances the several aperture array distributions are analyzed based diffraction theory detail. broadband, good in-band flatness, excellent directivity achieved by using proposed novel mirror surface. For verification purpose,...
A long pulse ECRH system with a goal of 140GHz 4MW 100~1000s has been developed to meet the requirement steady-state operation on EAST. Gycom gyrotrons are employed in No.1 and No.3 systems, CPI used No.2 No.4 systems. The development two gyrotron systems finished. first short EC wave injection demonstrated successfully during EAST 2015 Spring campaign. In commissioning towards operation, 0.4MW 100s injected plasma by using system, 4.7keV 102s L-mode H-mode have achieved help ECRH. Recently,...
An overcurrent protection system is developed to ensure the safety of gyrotrons in electron cyclotron resonance heating on experimental advanced superconducting tokamak. Both fast response subsystem and slow were developed. The current transformers used as sensors subsystem. models magnet built analyse effect environmental magnetic field using finite integration method. This analysis method novel results show that should be placed at a distance >2.2 m from centre its normal work. shunts...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation L. Zhang, T. B. J. Ding, M. H. Li, F. K. Liu, Shan, W. Wei, Y. C. Yang, Z. G. Wu, Wang, Zhao, D. Ma, Xiu, X. Jia, Cheng, Xu, Tang, Zhu, EAST Team; Preliminary investigation of the effects lower hybrid power on asymmetric behaviors in scrape-off layer experimental advanced superconducting tokamak. Physics...
A long pulse Electron Cyclotron Resonance Heating (ECRH) system is developed on EAST tokamak for plasma heating and current profile tailoring. The ECRH designed to operate at 140GHz inject 4MW CW power. With respect the physical objectives of newly built system, a quasi-optical launcher continuous wave into through an equatorial port. Gaussian beams delivered from evacuated corrugation waveguides will be focused reflected by high thermal conductive metal mirrors, then steered using push-rod...
The Electron Cyclotron Resonance Heating (ECRH) system of China Fusion Engineering Test Reactor (CFETR) is designed to inject 20 MW RF power into the plasma for heating and current drive (H&CD) applications. ECRH consists gyrotrons, associated supplies, transmission lines one launcher. In order compare launcher performance from equatorial upper ports, two types are in this paper. (EL), twenty in-vessel divided four groups. Every five gaussian beams face fixed focusing mirror steering...
In order to optimize the operational safety and reliability of upper launcher for CFETR ECRH system, a design NTM control based on remote steering concept is currently being carried out comparison with front equivalent. This paper presents layout analysis quasi-optical system in launcher. A 3D visual tool has been developed which can parameterize modeling, perform general astigmatic beam calculation show accurate propagation path port. Three identical sets modules are arranged launcher, each...
Electron Cyclotron Resonance Heating (ECRH) is the key auxiliary heating system in Chinese Fusion Engineering Test Reactor (CFETR). The function of ECRH antenna to inject high and long-pulse RF power into plasma for heating, current driving other physics applications. optical transmission characteristic gaussian beams decides ability antenna. Two improved optic designs based on previous analysis initial small size CFETR are provided this paper.
The electron cyclotron (EC) system on EAST consists of four gyrotrons with a frequency 140 GHz (second harmonic the extraordinary mode), each which is expected to deliver maximum power 1.0 MW and be operated at 100-1000 s pulse length. Significant progress in long-pulse operation has been achieved recently, including duration up 1056 EC injected into plasma 0.55 310 1.6 (output by 3 gyrotrons). High temperature ( T e >12 keV) measured Thomson scattering was produced combination lower...
The CFETR is the next generation magnetic confinement tokamak, its increasing heating needs and stringent shielding requirements present new challenges for ECRH launcher. In an effort to evaluat viability of equatorial launcher, a port plug prototype designed performance under steady state or some interrupted events assessed. well-configured steel/water ratio beneficial improve capability effectively mitigate 493 kW heat. maximum temperature less than 300 ℃ when inlet 70 ℃, average outlet...
The polarization control is very important for high power millimeter wave heating experiment on CFETR. Two polarizers with different groove depths were designed in this paper. calculated results reveal nearly arbitrary can be obtained by employing the collaboration of two polarizers, it would ensure proper mode acquisition at any beam injection angle.
Electron Cyclotron Resonance Heating (ECRH) is the key auxiliary heating system in Experimental Advanced Superconducting Tokamak (EAST). The function of ECRH antenna to inject high RF power into plasma resonance layer for heating, electron cyclotron current drive (ECCD), stabilization magneto hydrodynamics (MHD) modes and other physics applications. focusing mirrors are very important achieve fine localized deposition. In order further improve ability Gauss beam antenna, a new ellipsoidal...