A5037512611- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- Fusion materials and technologies
- Engineering Applied Research
- Iterative Learning Control Systems
- Nuclear reactor physics and engineering
- Power Systems and Renewable Energy
- Gyrotron and Vacuum Electronics Research
- Silicon and Solar Cell Technologies
- Numerical methods for differential equations
University of South China
2015-2024
Institute of Plasma Physics
2020
Chinese Academy of Sciences
2020
Abstract ENN He Long-2 (EHL-2) is the next-generation large Mega-Ampere (MA) spherical torus (ST) proposed and funded by company. The design parameters are: T i0 > 30 keV, n e0 ~1×10 20 m -3 , I p ~ 3 MA, B t T. How to achieve several MA current flat-top with limited voltage-second ( Vs ) of center solenoid (CS) coils one most challenges issue EHL-2. In order minimize consumption Vs, fully non-inductive start-up ECRH will be applied in ramp-up phase accomplished synergetic mode between CS...
Abstract According to the physics of tokamak start-up, this study constructs a zero-dimensional (0D) model applicable electron cyclotron (EC) wave assisted start-up in NCST spherical torus (spherical tokamak) and CN-H1 stellarators. Using constructed 0D model, results obtained under same conditions are compared validated against reference for pure hydrogen plasma tokamak. The good agreement, especially regarding temperature, ion temperature current. In presence finite Ohmic electric field...
The electron cyclotron wave (ECW) current drive (CD) for the HL-2A tokamak is investigated numerically with a new ray-tracing and Fokker-Planck code. code benchmarked other well-tested linear quasilinear codes then used to study on tokamak. propagation, power deposition, driven-current profiles are presented. effect of trapping also assessed. It found that effects negligible at present ECW levels when both waves injected an angle 20° plasma equatorial plane, CD efficiency saturates ∼0.029 ×...
Abstract Based on OMFIT framework and HL-2M parameters, this paper comprehensively considers the changes in plasma density, temperature, other transport quantities caused by interaction of neutral beam injection (NBI) electron cyclotron wave (ECW) with plasma. The Shafranov shift magnetic surface center are also evaluated. Theoretically, influence NBI deposition location current drive efficiency ECW is studied. According to findings, affected position (ECCD) deposited both high field side...
Localized current drive by electron cyclotron (EC) waves is of significant importance in the outer half region tokamak plasmas. Using coupled GENRAY/CQL3D suite codes, a systematic comparative study between Ohkawa (OKCD) and (ECCD) performed. The results show that OKCD has more advantages than ECCD for far off-axis localized tokamaks with large inverse aspect ratios, while efficient low ratios. local driving on q = 2 rational surface both are effective control m 2/n 1 tearing mode or...
Abstract For a fusion device, plasma pre-heating is required before the self-sustaining burning-state reactions of deuterium (D) and tritium (T) commence. Plasma heating with waves in ion-cyclotron range frequencies (ICRF) effective tokamaks. A new three-ion ICRF scheme for plasmas Chinese Fusion Engineering Test Reactor (CFETR) that require an increase bulk ion temperature via lithium impurities D–T plasmas, was studied numerically. Our simulations show radio-frequency wave power strongly...
A localized and efficient current drive method in the outer-half region of tokamak with a large inverse aspect ratio is proposed via Ohkawa mechanism electron cyclotron (EC) waves. Further off-axis (OKCD) EC waves was investigated high beta βe HL-2M-like tokamaks ratio, EAST-like low ratio. OKCD can be driven efficiently, profile spatially radial region, ranging from 0.62 to 0.85, where fraction trapped electrons provides an excellent advantage for OKCD. Furthermore, efficiency increases...
The current driven by combined electron cyclotron wave (ECW) and high harmonic fast is investigated using the GENRAY/CQL3D package. It shown that no significant synergetic found in a range of cases with ECW (FW). This result consistent previous study [Harvey et al., Proceedings IAEA TCM on Fast Wave Current Drive Reactor Scale Tokamaks (Synergy Complimentarily LHCD ECRH), Arles, France, IAEA, Vienna, 1991]. However, positive synergy effect does appear FW lower hybrid frequencies. can be...
Abstract On the basis of OMFIT integrated simulation platform and parameters HL-2M device, a hybrid scenario with typical safety factor q profile is simulated using joint injection method neutral beam electron cyclotron wave normalized toroidal beta ( β N ) 2.39. At same time, by analyzing effect impurity concentration Z eff pedestal density n e,ped on confinement, higher obtained, reaching 3.118. The research results indicate that turbulent stabilization caused gradually decreases from...
A new synergy mechanism between the Ohkawa current drive (OKCD) of electron cyclotron (EC) waves and lower hybrid (LHCD) is discovered discussed. The methodology to achieve this effect also introduced. Improvement OKCD efficiency can be achieved by up a factor ~2.5 in far off-axis radial region (ρ > 0.6) tokamak plasma. By making EC wave heating electrons have parallel velocity co-Ip direction counter-Ip direction, comes from results trapping detrapping processes. makes low-speed,...
Heating with the wave in ion cyclotron range of frequencies (ICRF) has been used development high-performance H-mode operations EAST. A different resonance heating scenario three-ion component plasma real experimental parameters on EAST was investigated using a numerical tool. Excellent radio frequency absorption found an extremely low 3He concentration (0.1%–0.4%) D-H-(3He) plasma, by adjusting composition appropriately our simulation. In this case, fundamental layer is located between two...
Abstract The combined drive current of the lower hybrid wave (LHW) and high harmonic fast (HHFW) was studied theoretically for first time, based on use low higher β e operational parameters in EAST. Broad significant synergistic effects are found simulation, (CD) efficiency is greatly improved, profile modified as a result synergy between two types waves. LHW interacted with resonant electrons parallel velocity region pushes them into adjacent resonance phase (HHFW), thus number HHFW...
Abstract Large-amplitude edge-localized modes (ELMs) are a major concern in the development of tokamak fusion energy. According to peeling–ballooning theoretical model, effective current drive pedestal region high-confinement (H-mode) plasmas can alter profile this and hence affect ELM instabilities. Using ray-tracing Fokker–Planck quasilinear codes, localized by electron cyclotron (EC) waves H-mode is studied paper. Numerical investigations performed under present-day medium-sized tokamaks...
Abstract Efficient ion heating is crucial for future fusion devices, and the only way to heat ions directly cyclotron resonance heating. Reported here a full wave solver integrated with Fokker–Planck code optimizing range of frequency waves International Thermonuclear Experimental Reactor deuterium–tritium plasma. Both direct absorption minority power transfer bulk via collisions are considered, while also accounting edge effects on near core. The simulation results show that appropriate...
Abstract Focusing on the impact of hot plasma effects electron cyclotron current drive (ECCD), this paper presents numerical results top launch ECCD (TL-ECCD) and outside midplane or equatorial-plane (EL-ECCD) in HL-3-like tokamak plasmas. For EL-ECCD, there is little difference calculated under cold propagation models, are not affected by dominant mechanism EC waves. In cases TL-ECCD, large initial parallel refraction makes influence become significant. range toroidal magnetic fields B T...
Abstract A preliminary simulation of ion cyclotron resonance heating (ICRH) in the poloidal cross-section at antenna location CN-H1 (Chinese Heliac 1) stellarator has been conducted for first time using full-wave solver TORIC. The scheme employed focuses on minority He4 (H), with an independent investigation into effects wave frequency, toroidal mode number, and concentration ICRH. Preliminary results indicate that, under conditions frequency f = 4.7MHz, central magnetic field B0 0.32T...
The optimal minimum ECCD power is evaluated numerically for completely suppressing the 3/2 and 2/1 NTMs in CFETR hybrid scenario. For two typical frequencies of sources launching from upper launcher (UL) ports, fec = 210 GHz 240 with O1-mode, UL1: (Ri, Zi) (8.47, 5.7) m UL2: (8.2, 4.5) m, higher frequency source UL2 port better than that low counterpart UL1 port. Using port, required to fully suppress precise alignment 12.4 MW 16.7 MW, respectively. When good cannot be achieved, results...
Abstract Simulation on the Ohkawa-mechanism-dominated current drive (OKCD) of electron cyclotron (EC) waves is performed using TORAY-GA linear code, and results are compared with those calculated by CQL3D quasi-linear code. It found that radial location OKCD profile almost identical between calculations. However, there significant differences in calculation total driven <?CDATA ${I_{\, ec}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub>...
Abstract A well-optimized design of an ion cyclotron resonance heating (ICRH) antenna is very important for steady-state plasma with high radio frequency (RF) power several tens megawatts. However, a sharp decrease in the coupling RF because impedance mismatch ICRH system issue that must be resolved present-day fusion reactors and International Thermonuclear Experimental Reactor. This paper has theoretically analyzed antenna's matching ELMy plasmas on experimental advanced superconducting...