Neutral beam injection

The neutral particle, Eng. Neutral Beam Injection ( NBI) is a method to heat a plasma.

These atoms are first fully ionized. After the ion source they undergo an acceleration grid, where they are accelerated by an electric field of several thousand volts. The amount of electrical voltage determines the speed reached and kinetic energy. Before a particle impinges on the plasma, passing it in a corresponding number of electrons by the addition of the neutralizer returns to the neutral state. Thereafter, the particles pass through even a deflection which is derived have not been neutralized particles. These fly in an ion swamp and not get into the plasma.

The neutral atoms can penetrate the plasma, and there transfer their kinetic energy to the particles of the plasma, which leads to heating of the plasma. This method comes in nuclear fusion experiments of the type tokamak (eg JET, TEXTOR, ITER ) are used. There initially hydrogen ions (meaning all the different isotopes) produced. The entire procedure is done under a very low pressure, which is generated by a high -performance vacuum pump in Neutralteilcheninjektor.

Special application in the TEXTOR - conditioning

In the experimental storage TEXTOR the Nuclear Research Centre Jülich, the neutral particle is except for plasma heating also used to change the direction of rotation of the plasma. Neutralteilcheninjektoren to two in the opposite direction are directed ( with respect to the plasma of rotation ) on the Plasmatorus. Therefore, a specific rotation change in both directions.