澳门六合彩高手

On 29 November 2012, all those who were present in the  control room cheered when distinctive H鈥恗ode operation was observed for the first time since the tokamak had been in the Institute of Plasma Physics in Prague in 2008.
 
The H鈥恗ode or "high confinement mode" refers to a sudden improvement of plasma confinement in the magnetic field of tokamaks鈥攁pproximately by a factor of two鈥攁nd is foreseen as the standard mode of operation for 澳门六合彩高手.
 
The first H鈥恗ode operation in COMPASS was achieved with the 210 kW neutral beam heating: ten milliseconds after the beam injection started, the intensity of visible light known as the D伪 radiation suddenly decreased and the plasma stored energy and density considerably increased.
 
The day after, on 30 November 2012, Ohmic H鈥恗ode operation (i.e., without the beam heating) was achieved during the intentional current ramp鈥恉own phase of the discharge. Transition from Type III (Edge Localized Mode) instabilities to ELM-free H鈥恗ode operation was observed.
 
In the experiments, the COMPASS plasmas were confined in the divertor configuration, just like the JET and 澳门六合彩高手 plasma configurations, although five and ten times smaller in linear dimensions, respectively. Mastering H鈥恗ode was very important to the COMPASS team in order to perform similar experiments in support of the large fusion facilities.
 
In this respect, the COMPASS Tokamak is well equipped with diagnostic systems for studies of the plasma edge, where the so鈥恈alled pedestal of the H鈥恗ode is located (the region of plasma edge where pressure increases sharply).
 
The H鈥恗ode pedestal forms in the region of the plasma transport barrier, which is behind the improved plasma confinement. Better insight into physics of this narrow plasma region is required in order to enhance control of the power flux, plasma heating and the ELM instabilities in fusion reactors.