Systems analysis for modular versus multi-beam HIF drivers Page: 2 of 10
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The most developed and studied concept for a induction accelerator driver for heavy ion fusion
(HIF) is the multi-beam design in which a hundred or more beams are grouped in an array and
accelerated through common induction cores [1,2]. The designs use quadrupole-focusing
magnets over the entire length of the accelerator, or in some cases use electrostatic quads at the
low energy end. After acceleration, the array must be split into two and the beams redirected to
provide two-sided illumination of the hohlraum target. Drift compression occurs during this final
transport section. Recently we have been exploring an alternate architecture, the modular driver,
in which the driver is subdivided into many (>10) independent accelerators (modules) with one
or more beams each. A key objective of the modular driver approach is to be able to demonstrate
all aspects of the driver (source-to-target) by building a single, lower cost module compared to a
full-scale, multi-beam driver. We have developed a system model to compare several design
options for modular drivers. The drivers are designed to meet the requirements of the hybrid
target , which can accommodate a larger spot size (~5 mm radius) than the distributed radiator
target that was used for the Robust Point Design (RPD) . In Section 2 we describe a driver
option that uses solenoid instead of quadrupole magnets in order to transport the required current
per module in a single beam. In Section 3 we show potential benefits of transitioning from
solenoid to quad magnets at some point along the accelerator. Section 4 discusses the potential
advantages that neutralized drift compression and relaxed target spot size requirements can have
for the mult-beam all-quad designs we have studied in the past, and Section 5 gives conclusions
and plans for next steps in the systems modeling work.
Meier / F.I-05
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Meier, W.R. & Logan, B.G. Systems analysis for modular versus multi-beam HIF drivers, article, July 27, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc783052/m1/2/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.