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Optimizing laser-accelerated ion beams for a collimated neutron source
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10.1063/1.3497011
/content/aip/journal/pop/17/11/10.1063/1.3497011
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/11/10.1063/1.3497011

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the dual target configuration. A laser pulse accelerates deuterium ions from the primary target (e.g., Au with rear D layer) toward the secondary target (e.g., 25 mm ) to create neutrons through fusion events in the secondary target.

Image of FIG. 2.
FIG. 2.

(a) Angle and energy [(b) 0°, (c) 90°] distributions of emitted neutrons for monoenergetic, normally incident ions of energy. 1 MeV (solid), 1 MeV (dot), and 10 MeV (dashed). Plots linearly scaled individually such that the maximum neutron emission in the angular and 0° plots are unity. Total yields: , , and . Yields in the forward direction (for comparison with Ref. 4): , , and .

Image of FIG. 3.
FIG. 3.

Monte Carlo calculated neutron yields from the LULI (dashed) and Trident (solid) lasers as a function of (a) angle and energy in the (b) 0° and (c) 90° directions.

Image of FIG. 4.
FIG. 4.

All dashed correspond to and solid to . Secondary target . (a) Calculated deuteron spectrum achievable at the ELI laser facility using the scaling in Ref. 18. (b) Projected angular neutron distribution. (c) Neutron energy distribution at 0° and (d) 90°.

Image of FIG. 5.
FIG. 5.

Schematic of microlens focusing technique (Ref. 11). Divergent deuterons are focused using a hollow cavity excited by a laser pulse. The resulting neutrons from the secondary target are consequently less divergent than without the microlens.

Image of FIG. 6.
FIG. 6.

Energy distribution at (a) 0° and (b) 90° of neutrons emitted from thin targets with incident ion energies of 1 MeV (solid), 10 MeV (dotted), and 50 MeV (dashed).

Image of FIG. 7.
FIG. 7.

[(a) and (b)] Incident ion and [(c) and (d)] emergent neutron energy distributions for thin targets and microlens focusing. [(a) and (c)] LULI spectrum with a microlens centered at 12 MeV and selection width of 0.1 MeV. [(b) and (d)] Moderate ELI spectrum with a microlens centered at 200 MeV and selection width of 5 MeV.

Tables

Generic image for table
Table I.

Comparison of conventional sources of neutron production with ultraintense laser facility capabilities. Yields represent “on target” neutron flux, for which the laser facilities assume a 1 m distant target, 20° divergent neutrons, and 1 Hz repetition rate for LULI and 1/60 Hz repetition for ELI.

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/content/aip/journal/pop/17/11/10.1063/1.3497011
2010-11-08
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimizing laser-accelerated ion beams for a collimated neutron source
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/11/10.1063/1.3497011
10.1063/1.3497011
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