نتایج جستجو برای: plasma confinement
تعداد نتایج: 372668 فیلتر نتایج به سال:
In this paper we propose a novel method of adding turbulence to low-res. smoke simulation. We consider the physical properties of such low-res. simulation and add turbulence only to the appropriate position where the value of the energy cascade ratio is judged as physically correct. Our method can prevent noise in the whole region of fluid surfaces which appeared with previous methods. We also ...
A theoretical framework is developed to generate tokamak equilibrium configurations for which, on one hand, the current results entirely from the bootstrap current source driven by the pressure gradient while, on the other hand, the pressure gradient is determined from the thermal conduction equation with a thermal diffusivity constructed to have properties observed in confinement experiments: ...
The first experimental observation of the sudden transition to the improved particle confinement mode in the H-1 heliac is reported and shows a clear dependence on magnetic configuration. In a lowtemperature plasma a transition to improved confinement followed by a twofold increase in the electron density is observed when the magnetic field exceeds a critical value Bcr . At B ø Bcr the transiti...
The possibility of fusion ignition in proton-Boron$^{11}$ plasma is strongly enhanced if the energy from fusion-produced $\alpha$ particles channeled to fast protons, but an environment which most protons are thermally distributed. This hybrid thermonuclear and beam-plasma offers surprisingly large advantages either purely or fusion, neither can by themselves significantly exceed bremsstrahlung...
Abstract Improvements to the stellarator concept can be realized through advancements in theoretical and computational plasma physics. Herein, recent advances are reported topical areas of: (1) improved energetic ion confinement, (2) impact of three-dimensional (3D) shaping on turbulent transport, (3) reducing coil complexity, (4) novel optimization design methods, (5) magnetohydrodynamic tools...
By manipulating magnetic reconnection in Madison Symmetric Torus (MST) discharges, we have generated and confined for the first time a reversedfield pinch (RFP) plasma with an ion temperature >1 keV and an electron temperature of 2 keV. This is achieved at a toroidal plasma current of about 0.5 MA, approaching MST’s present maximum. The manipulation begins with intensification of discrete magne...
ali hossein najafi abrand abadi associate professor, shahid beheshti university mohammad jafar habibzadeh associate professor, department of law, tarbiat modares university abulfat'h khaleghi ph.d. student of criminal law, tarbiat modares university the imprisonment (custodial sentences) is the most common and expensive sanction in the criminal law, which has enjoyed hardly any success on ...
Reduction of heat loading appropriate for the plasma facing components (PFCs) such as the divertor and the first wall is crucial for a fusion reactor. Impurity gas seeding is one of techniques to decrease peak heat flux to the divertor both in steady-state and transient phases. Power handling by large radiation power loss has been studied in the ELMy H-mode plasmas on JT-60U with argon (Ar) gas...
Regimes of High Confinement (H-mode) have been studied in the Alcator CMod tokamak [Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. Plasmas with no Edge Localized Modes (ELM-free) have been compared in detail to a new regime, Enhanced Dα (EDA). EDA discharges have only slightly lower energy confinement than comparable ELM-free ones, but show markedly reduced impurity confinement. Thus EDA dis...
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