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Extraction Compression and Acceleration of High Line Charge Density Ion Beams | IEEE Conference Publication | IEEE Xplore

Extraction Compression and Acceleration of High Line Charge Density Ion Beams


Abstract:

High Energy Density Physics (HEDP) applications require high line charge density ion beams. An efficient method to obtain this type of beams is to extract a long pulse, h...Show More

Abstract:

High Energy Density Physics (HEDP) applications require high line charge density ion beams. An efficient method to obtain this type of beams is to extract a long pulse, high current beam from a gun at high energy, and let the beam pass through a decelerating field to compress it. The low energy beam-bunch is loaded into a solenoid and matched to a Brillouin flow. The Brillouin equilibrium is independent of the energy if the relationship between the beam size (a), solenoid magnetic field strength (B) and line charge density is such that (Ba)^ 2 is proportional to the line charge density. Thus it is possible to accelerate a matched beam at constant line charge density. An experiment, NDCX-1c is being designed to test the feasibility of this type of injectors, where we will extract a 1 microsecond, 100 mA, potassium beam at 160 keV, decelerate it to 55 keV (density ∼ 0.2 μC/m), and load it into a 2.5 T solenoid where it will be accelerated to 100– 150 keV (head to tail) at constant line charge density. The head-to-tail velocity tilt can be used to increase bunch compression and to control longitudinal beam expansion. We will present the physics design and numerical simulations of the proposed experiment.
Date of Conference: 16-20 May 2005
Date Added to IEEE Xplore: 13 February 2006
Print ISBN:0-7803-8859-3

ISSN Information:

Conference Location: Knoxville, TN, USA

INTRODUCTION

The Neutralized Drift Compression Experiment (NDCX) is being constructed at the Lawrence Berkeley National Laboratory. NDCX will help develop novel, still unexplored beam manipulation techniques in order to establish the physics limits on compression of heavy ion beams for creating high energy density matter and fusion ignition conditions [1]. A critical early component being developed in this series of experiments is the Accel-Decel Injector which will enable a dramatic increase in ion beam line charge density after extraction from the ion source.

References

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