Скачать или смотреть What is Neutral beam injection?, Explain Neutral beam injection, Define Neutral beam injection

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~~~ Neutral beam injection ~~~

Title: What is Neutral beam injection?, Explain Neutral beam injection, Define Neutral beam injection
Created on: 2019-05-31
Source Link: https://en.wikipedia.org/wiki/Neutral...

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Description: Neutral beam injection is one method used to heat plasma inside a fusion device consisting in a beam of high-energy neutral particles that can enter the magnetic confinement field. When these neutral particles are ionized by collision with the plasma particles, they are kept in the plasma by the confining magnetic field, and can transfer most of their energy by further collisions with the plasma. By tangential injection in the torus, neutral beams provide also momentum to the plasma and current drive, one essential feature for long pulses of burning plasmas. Neutral beam injection is a flexible and reliable technique, which has been the main heating system on a large variety of fusion devices. To date, all NBI systems were based on positive precursor ion beams. In the 90s there has been impressive progress in negative ion sources and accelerators with the construction of multi-megawatt negative ion based NBI systems at LHD and JT-60U . The NBI designed for ITER is a substantial challenge and a prototype is being constructed to optimize its performance in view of the ITER future operations. Other ways to heat plasma for nuclear fusion include RF heating, electron cyclotron resonance heating , and ion cyclotron resonance heating .

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