Speaker
Description
Structured plasma channels are an essential technology for driving high-gradient plasma accelerator and for guiding charged particle beams in advanced concept accelerators. Carefully designed lasers can permit the generation of long plasma columns known as hydrodynamic, optically-field-ionized (HOFI) channels, which feature low on-axis densities and narrow radial extent. We present the development of 1D and 2D models of HOFI plasma channels via FLASH, a publicly available radiation hydrodynamics code. We explore sensitivities of the channel evolution to laser profile, intensity, and background gas conditions. We present comparisons using novel longitudinal interferometry measurements of experimentally-generated plasma channels, enabling the highest quality spatiotemporal measurements of axial density and channel asymmetry during evolution. We also identify the role that realistic laser asymmetries and aberrations play in determining channel characteristics for different delay times
Funding Agency
Work supported by DARPA and by the U.S. D.O.E.,Office of Science, Office of High Energy Physics under Award Number DE-SC0024244 and Contract No. DE-AC02-05CH11231.
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