Emittance growth from merging arrays of round beamlets

Anderson, O.A.

doi:10.1016/s0920-3796(96)00471-1

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…The normal procedure is to equate the initial and final energy, where for the final energy, the space-charge energy term is for a uniform beam and all of the kinetic part is assumed to be in the emittance [4]. There is a difficulty since the procedure relies on knowing what the matched beam radius is.…”

Section: Estimate Of Merged Emittancementioning

confidence: 99%

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Design and simulation of a multibeamlet injector for a high current accelerator

Grote¹,

Henestroza

Kwan

2003

Phys. Rev. ST Accel. Beams

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A multibeamlet approach to a high current ion injector, whereby a large number of beamlets are accelerated and then merged to form a single beam, offers a number of potential advantages over a monolithic single beam injector. These advantages include a smaller transverse footprint, more control over the shaping and aiming of the beam, and more flexibility in the choice of ion sources. A potential drawback, however, is a larger emittance. In this paper, we seek to understand the merging of the beamlets and how it determines the emittance. When the constraints imposed by beam propagation physics and practical engineering issues are included, the design is reduced to a few free parameters. We describe the physics design of a multibeamlet injector and produce a design for an example set of parameters. Extensive use of 2D and 3D particle simulations was made in understanding the injector. Design tolerances and sensitivities are discussed in general and in relation to the example.

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Section: Estimate Of Merged Emittancementioning

confidence: 99%

“…The free energy is usually normalized by the selffield energy inside the equivalent uniform beam. The final emittance has been calculated for a configuration of beamlets in concentric circles assuming that the total beam is matched, centered, and properly aimed [4]. …”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a multibeamlet injector for a high current accelerator

Grote¹,

Henestroza

Kwan

2003

Phys. Rev. ST Accel. Beams

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“…Single particle dynamics associated with the wrapping up of empty regions in phase space between the merging beams also contributes to the emittance of the equilibrated final (merged) state. An analytical description of the emittance growth from merging arrays of beams is in [6,7]. Early results from this experiment are in [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Scaled beam merging experiment for heavy ion inertial fusion

Seidl

Celata

Faltens

et al. 2003

Phys. Rev. ST Accel. Beams

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Transverse beam combining is a cost-saving option employed in many designs for heavy ion fusion drivers. However, the resultant transverse phase space dilution must be minimized so as not to sacrifice focusability at the target. A prototype combining experiment has been completed employing four 3-mA Cs beams injected at 160 keV. The focusing elements upstream of the merge consist of four quadrupoles and a final combined-function element (quadrupole and dipole). Following the merge, the resultant single beam is transported in a single alternating gradient channel where the subsequent evolution of the distribution function is diagnosed. The results are in fair agreement with particle-incell simulations. They indicate that for some heavy ion fusion driver designs, the phase space dilution from merging is acceptable.

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