1. Stable Witness-Beam Formation in a Beam-Driven Plasma Cathode
- Author
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M. J. Garland, Alexander Knetsch, S. Wesch, Severin Diederichs, Trupen Parikh, S. Bohlen, Paul Winkler, Lucas Schaper, J. Chappell, Jens Osterhoff, R. D'Arcy, Beatriz Schmidt, G. Boyle, Bernhard Hidding, Vladyslav Libov, S. Schröder, Gabriele Tauscher, B. Sheeran, M. Meisel, L. Boulton, J. C. Wood, A. Martinez de la Ossa, T. Brümmer, P. Gonzalez Caminal, Kristjan Poder, Ming Zeng, B. Foster, P. Niknejadi, and C. A. Lindstrøm
- Subjects
Nuclear and High Energy Physics ,Materials science ,Physics and Astronomy (miscellaneous) ,wake field [plasma] ,density [plasma] ,Trapping ,Electron ,QC770-798 ,7. Clean energy ,01 natural sciences ,Photocathode ,law.invention ,wake field [accelerator] ,law ,Physics::Plasma Physics ,Nuclear and particle physics. Atomic energy. Radioactivity ,0103 physical sciences ,Thermal emittance ,ddc:530 ,DESY Lab ,010306 general physics ,010308 nuclear & particles physics ,bibliography ,Surfaces and Interfaces ,Plasma ,stability ,electrode ,beam [electron] ,Cathode ,3. Good health ,velocity [electron] ,beam emittance ,efficiency ,energy spectrum [electron] ,Physics::Accelerator Physics ,Atomic physics ,injection [beam] ,Beam (structure) ,performance ,Relative energy - Abstract
Electron beams to be accelerated in beam-driven plasma wakes are commonly formed by a photocathode and externally injected into the wakefield of a preceding bunch. Alternatively, using the plasma itself as a cathode offers the possibility of generating ultrashort, low-emittance beams by trapping and accelerating electrons from the ambient plasma background. Here, we present a beam-driven plasma cathode realized via laser-triggered density-downramp injection, showing stable beam formation over more than a thousand consecutive events with an injection probability of 95%. The plasma cathode is highly tunable, resulting in the injection of electron bunches of tens of pC of charge, energies of up to 79 MeV, and relative energy spreads as low as a few percent. The stability of the injected beams was sufficiently high to experimentally determine their normalized emittance of 9.3 μm rms with a multishot method.
- Published
- 2021
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