Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration
Ning Xu, M. J. V. Streeter, O. C. Ettlinger, H. Ahmed, S. Astbury, M. Borghesi, Nicolas Bourgeois, C. B. Curry, S. J. D. Dann, N. P. Dover, T. Dzelzainis, V. Istokskaia, M. Gauthier, L. Giuffrida, G. D. Glenn, S. H. Glenzer, R. J. Gray, J. S. Green, George Hicks, C. Hyland, M.S. King, B. Loughran, D. Margarone, O. McCusker, P. McKenna, C. Parisuaña, P. Parsons, C. Spindloe, D. R. Symes, F. Treffert, C. A. J. Palmer, Z. Najmudin
Abstract
Abstract We present the development and characterization of a high-stability, multi-material, multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 Hz. The tape surface position was measured to be stable on the sub-micrometre scale, compatible with the high-numerical aperture focusing geometries required to achieve relativistic intensity interactions with the pulse energy available in current multi-Hz and near-future higher repetition-rate lasers ( $>$ kHz). Long-term drift was characterized at 100 Hz demonstrating suitability for operation over extended periods. The target was continuously operated at up to 5 Hz in a recent experiment for 70,000 shots without intervention by the experimental team, with the exception of tape replacement, producing the largest data-set of relativistically intense laser–solid foil measurements to date. This tape drive provides robust targetry for the generation and study of high-repetition-rate ion beams using next-generation high-power laser systems, also enabling wider applications of laser-driven proton sources.