Publication Date |
2005 |
Personal Author |
Qin, H.; Davidson, R. C.; Barnard, J. J.; Lee, E. P. |
Page Count |
26 |
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. |
Keywords |
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Source Agency |
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Corporate Authors |
Princeton Univ., NJ. Plasma Physics Lab.; Department of Energy, Washington, DC. |
Supplemental Notes |
Sponsored by Department of Energy, Washington, DC. |
Document Type |
Technical Report |
NTIS Issue Number |
200518 |