Abstract
The interaction of an intense ( n ∼10 11 cm -3 ), pulsed (200 ns), proton beam (∼80 keV and ∼380 A) with a transverse magnetic field B ⊥ produced by a pair of mirror coils has been studied experimentally. The beam is space-charge-neutralized and can travel across the magnetic field up to 3 kG by forming polarization electric field due to charge separation, which cancels out the deflection by the Lorentz force ν × B . It is observed that beam expansion along B ⊥ gives rise to the density reduction in the course of travelling. A model is proposed, which relates the outward force along B ⊥ to the density reduction and can explain the experimental results.
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