Generation and Measurement of Relativistic Electron Bunches Characterized by a Linearly Ramped Current Profile

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R. J. England, J. B. Rosenzweig, and G. Travish
Department of Physics and Astronomy, University of California Los Angeles, 405 Hilgard, Los Angeles, California 90095, USA

Received 9 January 2008; published 28 May 2008

Wereport the first successful attempt to generate ultrashort (1–10 ps) relativisticelectron bunches characterized by a ramped longitudinal current profile thatrises linearly from head to tail and then falls sharplyto zero. Bunches with this type of longitudinal shape maybe applied to plasma-based accelerator schemes as an optimized drivebeam, and to free-electron lasers as a means of reducingasymmetry in microbunching due to slippage. The scheme used togenerate the ramped bunches employs an anisochronous dogleg beam linewith nonlinear correction elements to compress a beam having aninitial positive time-energy chirp. The beam current profile is measuredusing a deflecting mode cavity, and a pseudoreconstruction of thebeam's longitudinal phase space distribution is obtained by using thisdiagnostic with a residual horizontal dispersion after the dogleg.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.214802
DOI:	10.1103/PhysRevLett.100.214802
PACS:	41.85.Ct; 29.27.Eg; 41.85.Ew 41.85.Ct Particle beam shaping, beam splitting 29.27.Eg Beam handling; beam transport in accelerators 41.85.Ew Particle beam profile, beam intensity YEAR: 2008

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