HIF transport issues for P≳10−3 Torr and Z≳1

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Abstract
Final transport schemes for HIF are examined, with emphasis on transport for p≳10− 3 Torr and Z≳1 since this should simplify the reactor design and reduce the length of the accelerator. Specifically the question of charge neutralization is addressed. We find (1) the fractional neutralization f needed scales as fi=(1−Z− 2) which means fi≳0.89 is needed for Z≳3; (2) axially‐trapped electrons limit the net beam potential to eφmin=α(1/2 mevi 2) with 1≤α≲4; (3) radially‐expelled plasma ions increase fi especially near the pellet; (4) radially‐oscillating plasma electrons have and adiabatic limit of fi≊0.5; and (5) as fi approaches unity, plasma particle trajectories may involve drift motions along and radially away from the ion beam. Also, criteria are given for the maximum Z/A allowed for transporting very large currents. For the HIF parameters used, it appears that neutralization will probably be adequte for Z≲3.

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