a1 Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.
Recently revised estimates of target gain have added additional optimistic inputs to the interface between targets, accelerators and fusion chamber beam transport. But it remains valid that neutralization of the beams in the fusion chamber is useful if ion charge state Z > 1 or if > 1 kA per beamlet is to be propagated. Some engineering and economic considerations favor higher currents.
(Received July 25 1984)
† Lawrence Berkeley Laboratory, Berkeley, CA 94720, U.S.A.
‡ Stanford Linear Accelerator Center, Stanford, CA, 94305, U.S.A.