The LBL Neutralized Beam Focusing Experiment

Abstract

This report was prepared as an account of work sponsored by an agency of tbe United States Government. Neither tbe United States Government nor any agency thereof, nor any of their |_BL-19579 employees, makes any warranty, express or implied, or assumes any legal liability or responsi-HIP" AKI 9fl/ bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or •"•" "N-Zo4 process disclosed, or represents that its use would not infringe privately owned rights. Refer ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom mendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

Collective focusing of intense ion beam pulses for high-energy density physics applications

“…[1][2][3][4][5][6][7] For instance, a solenoidal magnetic field of several hundred gauss can focus an intense neutralized ion beam within a short distance of several centimeters. Note that for a single-species non-neutral ion beam, a several Tesla magnetic field would be required to achieve the same focal length.…”

“…12,13 Also, propagation of a neutralized ͑by comoving electrons͒ ion beam along a strong solenoidal magnetic field with ce Ͼ pe can occur both in a heavy-ion driver 9 and in the laser-production of collimated ion beams 13 when a conventional ͑several Tesla͒ magnetic lens is used for ion beam focusing. Therefore, the extension of previous theoretical models [1][2][3][4][5][6][7] to the cases where ce Ͼ pe or r b Ͼ c / pe is of particular practical importance. In the present work, we investigate the operation of a collective focusing lens in these regimes, making use of advanced numerical simulations and reduced analytical models.…”