Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2004-10-01
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| Series: | Physical Review Special Topics. Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevSTAB.7.104201 |
| _version_ | 1818281404572631040 |
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| author | Hong Qin Ronald C. Davidson John J. Barnard Edward P. Lee |
| author_facet | Hong Qin Ronald C. Davidson John J. Barnard Edward P. Lee |
| author_sort | Hong Qin |
| collection | DOAJ |
| description | 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 nonperiodic 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 same focal spot. Drift compression and final focusing schemes are developed for a typical heavy ion fusion driver and for the integrated beam experiment being designed by the Heavy Ion Fusion Virtual National Laboratory. |
| first_indexed | 2024-12-13T00:04:35Z |
| format | Article |
| id | doaj.art-b17ef15af58046d193bcb6ec4fdbb76c |
| institution | Directory Open Access Journal |
| issn | 1098-4402 |
| language | English |
| last_indexed | 2024-12-13T00:04:35Z |
| publishDate | 2004-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Special Topics. Accelerators and Beams |
| spelling | doaj.art-b17ef15af58046d193bcb6ec4fdbb76c2022-12-22T00:06:19ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022004-10-0171010420110.1103/PhysRevSTAB.7.104201Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent latticeHong QinRonald C. DavidsonJohn J. BarnardEdward P. LeeIn 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 nonperiodic 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 same focal spot. Drift compression and final focusing schemes are developed for a typical heavy ion fusion driver and for the integrated beam experiment being designed by the Heavy Ion Fusion Virtual National Laboratory.http://doi.org/10.1103/PhysRevSTAB.7.104201 |
| spellingShingle | Hong Qin Ronald C. Davidson John J. Barnard Edward P. Lee Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice Physical Review Special Topics. Accelerators and Beams |
| title | Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice |
| title_full | Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice |
| title_fullStr | Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice |
| title_full_unstemmed | Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice |
| title_short | Drift compression and final focus for intense heavy ion beams with nonperiodic, time-dependent lattice |
| title_sort | drift compression and final focus for intense heavy ion beams with nonperiodic time dependent lattice |
| url | http://doi.org/10.1103/PhysRevSTAB.7.104201 |
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