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Title: Drift Compression and Final Focus for Intense Heavy Ion Beams with Non-periodic, Time-dependent Lattice

Abstract

In the currently envisioned configurations for heavy ion fusion, it is necessary to longitudinally compress the beam bunches by a large factor after the acceleration phase. Because the space-charge force increases as the beam is compressed, the beam size in the transverse direction will increase in a periodic quadrupole lattice. If an active control of the beam size is desired, a larger focusing force is needed to confine the beam in the transverse direction, and a non-periodic quadrupole lattice along the beam path is necessary. In this paper, we describe the design of such a focusing lattice using the transverse envelope equations. A drift compression and final focus lattice should focus the entire beam pulse onto the same focal spot on the target. This is difficult with a fixed lattice, because different slices of the beam may have different perveance and emittance. Four time-dependent magnets are introduced in the upstream of drift compression to focus the entire pulse onto the sam e focal spot. Drift compression and final focusing schemes are developed for a typical heavy ion fusion driver and for the Integrated Beam Experiment (IBX) being designed by the Heavy Ion Fusion Virtual National Laboratory.

Authors:
; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
836937
Report Number(s):
PPPL-4054
TRN: US0500844
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 14 Feb 2005
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ACCELERATION; COMPRESSION; DESIGN; FOCUSING; HEAVY IONS; MAGNETS; QUADRUPOLES; SPACE CHARGE; INERTIAL CONFINEMENT FUSION; BEAM COMPRESSION; FINAL FOCUS; TIME-DEPENDENT LATTICE

Citation Formats

Hong Qin, Ronald C. Davidson, John J. Barnard, and Edward P. Lee. Drift Compression and Final Focus for Intense Heavy Ion Beams with Non-periodic, Time-dependent Lattice. United States: N. p., 2005. Web. doi:10.2172/836937.
Hong Qin, Ronald C. Davidson, John J. Barnard, & Edward P. Lee. Drift Compression and Final Focus for Intense Heavy Ion Beams with Non-periodic, Time-dependent Lattice. United States. doi:10.2172/836937.
Hong Qin, Ronald C. Davidson, John J. Barnard, and Edward P. Lee. Mon . "Drift Compression and Final Focus for Intense Heavy Ion Beams with Non-periodic, Time-dependent Lattice". United States. doi:10.2172/836937. https://www.osti.gov/servlets/purl/836937.
@article{osti_836937,
title = {Drift Compression and Final Focus for Intense Heavy Ion Beams with Non-periodic, Time-dependent Lattice},
author = {Hong Qin and Ronald C. Davidson and John J. Barnard and Edward P. Lee},
abstractNote = {In the currently envisioned configurations for heavy ion fusion, it is necessary to longitudinally compress the beam bunches by a large factor after the acceleration phase. Because the space-charge force increases as the beam is compressed, the beam size in the transverse direction will increase in a periodic quadrupole lattice. If an active control of the beam size is desired, a larger focusing force is needed to confine the beam in the transverse direction, and a non-periodic quadrupole lattice along the beam path is necessary. In this paper, we describe the design of such a focusing lattice using the transverse envelope equations. A drift compression and final focus lattice should focus the entire beam pulse onto the same focal spot on the target. This is difficult with a fixed lattice, because different slices of the beam may have different perveance and emittance. Four time-dependent magnets are introduced in the upstream of drift compression to focus the entire pulse onto the sam e focal spot. Drift compression and final focusing schemes are developed for a typical heavy ion fusion driver and for the Integrated Beam Experiment (IBX) being designed by the Heavy Ion Fusion Virtual National Laboratory.},
doi = {10.2172/836937},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {2}
}