| 摘要 |
FIELD: physics. ^ SUBSTANCE: method and apparatus for guiding an electron beam in the channel of a linear accelerator can be used in linear induction accelerators of high-current pulsed electron beams during their acceleration and/or transportation in vacuum channels longer than 1 m. In the method, an extra beam is generated at the same time the main beam enters the extra beam or before the current of the extra beam reaches a value equal to 0.1-0.3 of its amplitude value Ie, at that moment in time, where the said value is selected from the condition: Ie =(0.1 -0.3)Im, where Im is amplitude of the main beam. Diametre of emitters and their length in the device simultaneously satisfy the inequalities: D/d>0.1Lm/Le, D/d<0.3- Lm/Le, where D is the inner diametre of the extra emitter, d is the outer diametre of the main emitter, Lm is the length of the main emitter, Le is the length of the extra emitter. The condition Id=(0.10.3)Im holds when said inequalities are satisfied. ^ EFFECT: reduced loss of electrons of the main beam and increase in dose of deceleration radiation from the target owing to reduction or damping amplitude of high-frequency radial oscillations of electrons in the main electron beam, stabilisation of dynamics of this beam in the channel and preservation of the shape of the current pulse on the length of the channel. ^ 2 cl, 1 dwg |
