Abstract
The numerical calculations of the longitudinal motion in multi-mirror reactor have shown that the energy contribution of α-particles has substantial influence on the gain factor (the given off thermonuclear energy/ the initial imparted energy) in the temperature region 5-7 keV. The numerical technique has been developed that takes into account the radial distribution of α-particles caused by their drag on electrons. This effect is substantial for ϱα/R ⩾ 1/2 (where ϱα is α-particles gyro radius, R is a plasma radius), e.g. for Gas-Dynamic trap. In a Tandem-Mirror reactor some part of fusion α-particles have the probability to slow down to the plasma energy, that can lead to the `poisoning' of the reactor by the thermonuclear reaction products. The fusion α-particles can have a strong effect on accumulation of impurities with z ⩽ 15 and thermal α-particles in TMR.
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