HIF 2010
18th International Symposium
on Heavy Ion Inertial Fusion -
Information

Title:	Dr.
Family Name:	Kaganovich
First Name:	Igor
E-Mail:	ikaganovpppl.gov
Affiliation for Badge:	Princeton University
Institute:
Address (Street):	Princeton Plasma Physics Laboratory
Postal Code, City:	Princeton, New Jersey, 08543 USA
Country:	United States
Phone:	6092433277
Fax:	6092432418
Payment:	Bank transfer to GSI
Author(s):	I. D. Kaganovich, E. A. Startsev, M. Dorf and R. C. Davidson
Institute(s):	Plasma Physics Laboratory, Princeton University, Princeton, New Jersey, 08543 USA
Title:	Technical Issues and Challenges of Neutralized Drift Compression for Focusing of Intense Ion Beam Pulses*
Abstract:	Neutralized drift compression offers an effective means for intense particle beam focusing and current amplification. In neutralized drift compression, a linear radial and longitudinal velocity tilt is applied to the beam pulse, so that the beam pulse compresses as it drifts in the focusing section through background plasma. The beam intensity can increase more than a factor of 100 in both the radial and longitudinal directions. In this paper we review the conceptual design of a robust neutralized drift compression system, study the optimal configuration of the focusing and neutralizing elements, and analyze the factors that may prevent achieving high compression. The self-electric and self-magnetic fields can prevent tight ballistic focusing and have to be efficiently neutralized by supplying neutralizing electrons. Electrons can be supplied by placing electron emitting filaments, inserting a biased grid into the beam path, and by producing a volumetric plasma or a finite-length plasma ¿ a so-called plasma plug. Limitations of each method are analyzed by comparing particle-in-cell simulation results with analytical calculations. The proposed theoretical models can predict the self-electric and self-magnetic fields of the beam propagating in the target plasma for a wide range of system parameters. The predictions of the analytical model agree very well with numerical simulation results. The model predicts very good charge neutralization only if volumetric plasma is used with density much larger than the beam density. * Research supported by the U.S. Department of Energy.
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