HIF transport issues for P≳10^{}^{3} Torr and Z≳1
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 f_{i}=(1Z^{}^{2}) which means f_{i}≳0.89 is needed for Z≳3; (2) axiallytrapped electrons limit the net beam potential to eφ_{min}=α(1/2 m_{e}v_{i}^{2}) with 1≤α≲4; (3) radiallyexpelled plasma ions increase f_{i} especially near the pellet; (4) radiallyoscillating plasma electrons have and adiabatic limit of f_{i}≊0.5; and (5) as f_{i} 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.
 Publication:

Heavy Ion Inertial Fusion
 Pub Date:
 January 1986
 DOI:
 10.1063/1.36322
 Bibcode:
 1986AIPC..152..215O
 Keywords:

 28.50.Re;
 29.25.Fb