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Title: Differential acceleration in the final beam lines of a Heavy Ion Fusion driver

A long-standing challenge in the design of a Heavy Ion Fusion power plant is that the ion beams entering the target chamber, which number of order a hundred, all need to be routed from one or two multi-beam accelerators through a set of transport lines. The beams are divided into groups, which each have unique arrival times and may have unique kinetic energies. It is also necessary to arrange for each beam to enter the target chamber from a prescribed location on the periphery of that chamber. Furthermore, it has generally been assumed that additional constraints must be obeyed: that the path lengths of the beams in a group must be equal, and that any delay of \main-pulse" beams relative to \foot-pulse" beams must be provided by the insertion of large delay-arcs in the main beam transport lines. Here we introduce the notion of applying \di erential acceleration" to individual beams or sets of beam at strategic stages of the transport lines. That is, by accelerating some beams \sooner" and others \later," it is possible to simplify the beam line con guration in a number of cases. For example, the time delay between the foot and main pulses can bemore » generated without resorting to large arcs in the main-pulse beam lines. It is also possible to use di erential acceleration to e ect the simultaneous arrival on target of a set of beams ( e.g., for the foot-pulse) without requiring that their path lengths be precisely equal. We illustrate the technique for two model con gurations, one corresponding to a typical indirect-drive scenario requiring distinct foot and main energies, and the other to an ion-driven fast-ignition scenario wherein the foot and main beams share a common energy.« less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Virtual National Laboratory for Heavy Ion Fusion Science (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0168-9002
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 733; Journal Issue: C; Journal ID: ISSN 0168-9002
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
Country of Publication:
United States
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; 43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION Heavy-ion fusion; Ion beam; Accelerator; Inertial fusion energy; Beam line; Pulse compression