Sunday , May 29 2022

Chinese fusion software pushes to 100 million previous levels [Report]



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The advanced experimental Tokamak, known as the "Chinese Artificial Sun", has reached an electron temperature of over 100 million degrees in its base plasma during a four-month experiment this year. It is about seven times larger than the interior of the sun, which is about 15 million degrees C.


The experiment shows that China is making significant progress in producing tokamak fusion energy.

The experiment was conducted by the EAST team at the Hefei Institute of Physical Sciences of the Chinese Academy of Sciences (CASHIPS), in collaboration with domestic and international colleagues.

The plasma flow density profile has been optimized by the effective integration and synergy of four types of heating power: lower hybrid heating, electronic cycling wave heating, cyclotron ion resonance heating, and neutral beam ion heating.

The injection of energy exceeded 10 MW and the energy stored in plasma increased to 300 kJ after scientists optimized the coupling of different heating techniques. The experiment used advanced plasma control and predictive theory / simulation.

Scientists have performed plasma balance and instability, limiting and transport experiments, plasma-wall interaction and particle physics to demonstrate long-term, steady-state H-mode operation with good control of impurities, exhaust heat through an ITER tungsten diverter.

With ITER-like operating conditions, such as the dominant heating of low frequency radio waves, lower torque and diverging water cooling tungsten, EAST has achieved a completely non-inductive steady-state scenario with an expansion of fusion performance high density, birth.

Meanwhile, to solve particle and power emissions, which is critical to high-performance steady-state operations, the EAST team has used numerous techniques to control edge-to-edge and wall-to-wall impurities along with active feedback control on the heating diverter.

Operational scenarios, including high-performance steady state and electron temperatures over 100 million degrees on EAST, have made unique contributions to ITER, the China Fusion Technology Testing Reactor (CFETR) and DEMO.

These results provide key data for validation of evacuation, transport and current models. They also increase confidence in CFETR fusion performance predictions.

Today, CFETR's physics design focuses on optimizing a third evolution machine with 7 m high radiation with a minor radius of 2 m with a toroidal magnet field of 6.5-7 Tesla and a plasma current of 13 MA.

In support of the engineering development of CFETR and the future DEMO, a new national Mega Science project – Comprehensive Research Facility will be launched later this year.

This new project will advance the development of tritium square test modules, superconducting technology, actuators and heating sources, and the operation of the reactor drive and diverter material.

EAST is the first superconductive tokamak with a non-circular cross-section in the world. It was designed and built by China, focusing on key scientific issues related to the application of fusion power. Since its inception in 2006, EAST has become a fully-fledged test facility, where the global fusion community can conduct ITER-related physics balance and research.

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The advanced experimental Tokamak, known as the "Chinese Artificial Sun", has reached an electron temperature of over 100 million degrees in its base plasma during a four-month experiment this year. It is about seven times larger than the interior of the sun, which is about 15 million degrees C.

The experiment shows that China is making significant progress in producing tokamak fusion energy.

The experiment was conducted by the EAST team at the Hefei Institute of Physical Sciences of the Chinese Academy of Sciences (CASHIPS), in collaboration with domestic and international colleagues.

The plasma flow density profile has been optimized by the effective integration and synergy of four types of heating power: lower hybrid heating, electronic cycling wave heating, cyclotron ion resonance heating, and neutral beam ion heating.

The injection of energy exceeded 10 MW and the energy stored in plasma increased to 300 kJ after scientists optimized the coupling of different heating techniques. The experiment used advanced plasma control and predictive theory / simulation.

Scientists have performed plasma balance and instability, limiting and transport experiments, plasma-wall interaction and particle physics to demonstrate long-term, steady-state H-mode operation with good control of impurities, exhaust heat through an ITER tungsten diverter.

With ITER-like operating conditions, such as the dominant heating of low frequency radio waves, lower torque and diverging water cooling tungsten, EAST has achieved a completely non-inductive steady-state scenario with an expansion of fusion performance high density, birth.

Meanwhile, to solve particle and power emissions, which is critical to high-performance steady-state operations, the EAST team has used numerous techniques to control edge-to-edge and wall-to-wall impurities along with active feedback control on the heating diverter.

Operational scenarios, including high-performance steady state and electron temperatures over 100 million degrees on EAST, have made unique contributions to ITER, the China Fusion Technology Testing Reactor (CFETR) and DEMO.

These results provide key data for validation of evacuation, transport and current models. They also increase confidence in CFETR fusion performance predictions.

Today, CFETR's physics design focuses on optimizing a third evolution machine with 7 m high radiation with a minor radius of 2 m with a toroidal magnet field of 6.5-7 Tesla and a plasma current of 13 MA.

In support of the engineering development of CFETR and the future DEMO, a new national Mega Science project – Comprehensive Research Facility will be launched later this year.

This new project will advance the development of tritium square test modules, superconducting technology, actuators and heating sources, and the operation of the reactor drive and diverter material.

EAST is the first superconductive tokamak with a non-circular cross-section in the world. It was designed and built by China, focusing on key scientific issues related to the application of fusion power. Since its inception in 2006, EAST has become a fully-fledged test facility, where the global fusion community can conduct ITER-related physics balance and research.

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