Final focus system for high intensity beams
The neutralized transport experiment (NTX) at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final-focus systems for high perveance heavy ion beams. The final-focus scenario in a heavy ion fusion driver consists of several large aperture quadrupole magne...
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American Physical Society
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Series: | Physical Review Special Topics. Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevSTAB.8.052801 |
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doaj-a5fff51b945a41b4a5dcaca0c803017a2020-11-25T02:40:10ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022005-05-018505280110.1103/PhysRevSTAB.8.052801Final focus system for high intensity beamsEnrique HenestrozaShmuel EylonPrabir K. RoySimon S. YuFrank M. BieniosekDerek B. ShumanWilliam L. WaldronThe neutralized transport experiment (NTX) at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final-focus systems for high perveance heavy ion beams. The final-focus scenario in a heavy ion fusion driver consists of several large aperture quadrupole magnets followed by a drift section in which the beam space charge is neutralized by a plasma. This beam is required to hit a millimeter-sized target spot at the end of the drift section. The objective of the NTX experiments and associated theory and simulations is to study the various physical mechanisms that determine the final spot size (radius r_{s}) at a given distance (f) from the end of the last quadrupole. In a fusion driver, f is the standoff distance required to keep the chamber wall and superconducting magnets properly protected. The NTX final quadrupole focusing system produces a converging beam at the entrance to the neutralized drift section where it focuses to a small spot. The final spot is determined by the conditions of the beam entering the quadrupole section, the beam dynamics in the magnetic lattice, and the plasma neutralization dynamics in the drift section. The main issues are the control of emittance growth due to high order fields from magnetic multipoles and image fields. In this paper, we will describe the theoretical and experimental aspects of the beam dynamics in the quadrupole lattice, and how these physical effects influence the final beam size. In particular, we present theoretical and experimental results on the dependence of final spot size on geometric aberrations and perveance.http://doi.org/10.1103/PhysRevSTAB.8.052801 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Enrique Henestroza Shmuel Eylon Prabir K. Roy Simon S. Yu Frank M. Bieniosek Derek B. Shuman William L. Waldron |
spellingShingle |
Enrique Henestroza Shmuel Eylon Prabir K. Roy Simon S. Yu Frank M. Bieniosek Derek B. Shuman William L. Waldron Final focus system for high intensity beams Physical Review Special Topics. Accelerators and Beams |
author_facet |
Enrique Henestroza Shmuel Eylon Prabir K. Roy Simon S. Yu Frank M. Bieniosek Derek B. Shuman William L. Waldron |
author_sort |
Enrique Henestroza |
title |
Final focus system for high intensity beams |
title_short |
Final focus system for high intensity beams |
title_full |
Final focus system for high intensity beams |
title_fullStr |
Final focus system for high intensity beams |
title_full_unstemmed |
Final focus system for high intensity beams |
title_sort |
final focus system for high intensity beams |
publisher |
American Physical Society |
series |
Physical Review Special Topics. Accelerators and Beams |
issn |
1098-4402 |
publishDate |
2005-05-01 |
description |
The neutralized transport experiment (NTX) at the Heavy Ion Fusion Virtual National Laboratory is exploring the performance of neutralized final-focus systems for high perveance heavy ion beams. The final-focus scenario in a heavy ion fusion driver consists of several large aperture quadrupole magnets followed by a drift section in which the beam space charge is neutralized by a plasma. This beam is required to hit a millimeter-sized target spot at the end of the drift section. The objective of the NTX experiments and associated theory and simulations is to study the various physical mechanisms that determine the final spot size (radius r_{s}) at a given distance (f) from the end of the last quadrupole. In a fusion driver, f is the standoff distance required to keep the chamber wall and superconducting magnets properly protected. The NTX final quadrupole focusing system produces a converging beam at the entrance to the neutralized drift section where it focuses to a small spot. The final spot is determined by the conditions of the beam entering the quadrupole section, the beam dynamics in the magnetic lattice, and the plasma neutralization dynamics in the drift section. The main issues are the control of emittance growth due to high order fields from magnetic multipoles and image fields. In this paper, we will describe the theoretical and experimental aspects of the beam dynamics in the quadrupole lattice, and how these physical effects influence the final beam size. In particular, we present theoretical and experimental results on the dependence of final spot size on geometric aberrations and perveance. |
url |
http://doi.org/10.1103/PhysRevSTAB.8.052801 |
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