Device and method for imploding a microsphere with a fast liner

Details Device and method for imploding a microsphere with a fast liner Device and method for imploding a microsphere with a fast liner

1979-02-05

1981-04-21

Cangialosi, S. A.

176 5, G21B 100

Patent

active

042630959

ABSTRACT:
A device and method for relativistic electron beam heating of a high-density plasma in a small localized region. A relativistic electron beam generator or accelerator produces a high-voltage electron beam which propagates along a vacuum drift tube and is modulated to initiate electron bunching within the beam. The beam is then directed through a low-density gas chamber which provides isolation between the vacuum modulator and the relativistic electron beam target. The relativistic beam is then applied to a high-density target plasma which typically comprises DT, DD, hydrogen boron or similar thermonuclear gas at a density of 10.sup.17 to 10.sup.20 electrons per cubic centimeter. The target gas is ionized prior to application of the electron beam by means of a laser or other preionization source to form a plasma. Utilizing a relativistic electron beam with an individual particle energy exceeding 3 MeV, classical scattering by relativistic electrons passing through isolation foils is negligible. As a result, relativistic streaming instabilities are initiated within the high-density target plasma causing the relativistic electron beam to efficiently deposit its energy and momentum into a small localized region of the high-density plasma target. Fast liners disposed in the high-density target plasma are explosively or ablatively driven to implosion by a heated annular plasma surrounding the fast liner generated by an annular relativistic electron beam. An azimuthal magnetic field produced by axial current flow in the annular plasma, causes the energy in the heated annular plasma to converge on the fast liner to drive the fast liner to implode a microsphere.

REFERENCES:
Phys. of Fluids, vol. 19, No. 6, (6/76), pp. 831-848, Thode, Plasma Heating by Relativistic Electron Beams.
Nuclear Fusion Suppl., (1977), vol. 2, p. 543, Thode II.
J. Appl. Phys., vol. 44, No. 11, (11/73), pp. 4913-4919, Mather et al.
Sov. Tech. Phys. Lett., vol. 2, No. 1, (1/76), pp. 20-22, Kiselev et al.
Phys. of Fluids, vol. 20, No. 12, (12/77), pp. 2121-2127, Thode III.

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