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Plasma-Jet Driven Magneto-Inertial Fusion
来源: 日期2018-11-28 09:45 点击:

报告题目Plasma-Jet Driven Magneto-Inertial Fusion          



Prof. Yong Chia Francis THIO   HyperJet Fusion Corporation


Magneto-inertial fusion (MIF) [1-5] is emerging as a new class of fusion approaches thanks to the stewardship of NASA, the Office of Fusion Energy Sciences (FES), the National Nuclear Security Administration (NNSA) and the Advanced Project Research Agency - Energy (ARPA-E) of the Department of Energy in the U.S., and the Institute of Applied Physics and Computational Mathematics (IAPCM) in China. In China, MIF is on the agenda of the present Five-Year Plan of China. MIF is a hybrid of magnetic and inertial fusion, attempting to combine the best features of both – the suppression of electron transport and the enhancement of alpha deposition by the use of a magnetic field on the one hand, and the efficient compressional heating and inertial containment of the burning plasma pressure on the other hand. In MIF, a material shell (known as the liner) is used to implode a magnetized plasma (the target plasma) to create a burning plasma.

Development in magnetic fusion in recent years has pointed towards higher fields and higher density as pathways to more compact and less costly magnetic fusion configurations. From the perspective of magnetic fusion, the burning plasma in MIF is a magnetic configuration that enjoys the advantage of having a density and magnetic field several orders of magnitude over the best that conventional magnetic fusion approaches can offer. From the perspective of inertial fusion, because the magnetic field in the target plasma slows down electron thermal transport in MIF, the implosion velocity (hence the implosion power density) required is substantially reduced, leading to the possibility of using much less costly implosion drivers. These features of MIF have the potential of making MIF one or two orders of magnitude less expensive than conventional magnetic and inertial fusion, hence a surge of interest by private investments in this space in recent years [6,7].

Gaseous, liquid or solid liners are candidate liners for MIF. Gaseous liners are used in plasma-jet driven magneto-inertial fusion (PJMIF) [8-15], one of the many possible embodiments of MIF. In a commercial gigawatt-scale PJMIF fusion reactor for power generation, it is envisioned that up to 600 plasma guns may be used to launch two spherical arrays of plasma jets [16]. Both arrays merge at their respective merging radii to form two respective plasma shells initially.

The inner plasma shell carries the fusion fuel (a mixture of deuterium and tritium) and converges first to form a plasma ball, the target plasma, at the center. The target plasma has to be magnetized. This may be accomplished in two ways. Magnetic flux may be embedded in the plasma jets that are used to form the target plasma. Alternatively, magnetic field may be actively induced in the target plasma by the use of laser-driven plasma beat waves [17] or by the use of charged particle beams. Development of the target plasma suitable for PJMIF is an active area of research in the development of PJMIF [18].

The outer plasma shell is the plasma liner that also converges towards the center and is used to implode the target plasma to create the burning plasma. An extension of the plasma liner is to include a thin but dense layer of fusion fuel, called the ‘afterburner’, which serves the same function as the cold fuel layer in conventional ICF, i.e. to amplify the fusion gain of the target, by using the alpha particles produced by the target to ignite a cold, dense layer of DT.

Details of the above together with the status of the current research in PJMIF will be presented.


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