Ion beam focusing with cone optics for WDM experiments

Hasegawa, Jun; Kondo, Kotaro; Oguri, Y.; Horioka, Kazuhiko

doi:10.1016/j.nima.2013.05.098

Cited by 1 publication

(1 citation statement)

References 17 publications

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“…However, passive focusing schemes have been investigated which employ material structures to reduce self-fields. These include: Metallic conic guide tubes for electron focusing [3] and ion focusing [4], and stacks of thin foils for electron focusing [5]. Recently, it has been shown that ion beams propagating through a stack of thin metallic foils can be magnetically self-focused due to the mitigation of their electrostatic repulsion [6].…”

Section: Introductionmentioning

confidence: 99%

Scattering effects in passive foil focusing of ion beams

Yuen

Lund

Barnard

et al. 2015

Phys. Rev. ST Accel. Beams

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A stack of thin, closely spaced conducting foils has been investigated by Lund et al. [Phys. Rev. ST Accel. Beams 16, 044202 (2013)] as a passive focusing lens for intense ion beams. The foils mitigate spacecharge defocusing forces to enable the beam self-magnetic field to focus. In this study, we analyze possible degradation of focusing due to scattering of beam ions resulting from finite foil thickness using an envelope model and numerical simulations with the particle-in-cell code WARP. Ranges of kinetic energy where scattering effects are sufficient to destroy passive focusing are quantified. The scheme may be utilized to focus protons produced in intense laser-solid accelerator schemes. As an example, the spot size of an initially collimated 30 MeV proton beam with initial rms radius 200 μm, perveance Q ¼ 1.8 × 10 −2 , and initial transverse emittance ε x;rms ¼ 0.87 mm mrad propagating through a stack of 6.4 μm thick foils, spaced 100 μm apart, gives a 127.5 μm spot with scattering and a 81.0 μm spot without scattering, illustrating the importance of including scattering effects.

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