Electron trapping and acceleration by the plasma wakefield of a self-modulating proton beam
- Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, Russia and Novosibirsk State University, 630090 Novosibirsk (Russian Federation)
- Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, Russia and CERN, CH-1211 Geneva 23 (Switzerland)
- Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon (Portugal)
- CERN, CH-1211 Geneva 23 (Switzerland)
- Max Planck Institute for Physics, 80805 Munich (Germany)
It is shown that co-linear injection of electrons or positrons into the wakefield of the self-modulating particle beam is possible and ensures high energy gain. The witness beam must co-propagate with the tail part of the driver, since the plasma wave phase velocity there can exceed the light velocity, which is necessary for efficient acceleration. If the witness beam is many wakefield periods long, then the trapped charge is limited by beam loading effects. The initial trapping is better for positrons, but at the acceleration stage a considerable fraction of positrons is lost from the wave. For efficient trapping of electrons, the plasma boundary must be sharp, with the density transition region shorter than several centimeters. Positrons are not susceptible to the initial plasma density gradient.
- OSTI ID:
- 22407938
- Journal Information:
- Physics of Plasmas, Vol. 21, Issue 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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