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Title: Low transverse emittance electron bunches from two-color laser-ionization injection

Journal Article · · Proceedings of SPIE - The International Society for Optical Engineering
DOI:https://doi.org/10.1117/12.2021089· OSTI ID:1602794
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Shanghai Jiao Tong Univ. (China)
+ Show Author Affiliations

A method is proposed to generate low emittance electron bunches from two color laser pulses in a laser-plasma accelerator. A two-region gas structure is used, containing a short region of a high-Z gas (e.g., krypton) for ionization injection, followed by a longer region of a low-Z gas for post-acceleration. A long-laser-wavelength (e.g., 5 μm) pump pulse excites plasma wake without triggering the inner-shell electron ionization of the high-Z gas due to low electric fields. A short-laser-wavelength (e.g., 0.4 μm) injection pulse, located at a trapping phase of the wake, ionizes the inner-shell electrons of the high-Z gas, resulting in ionization-induced trapping. Compared with a single-pulse ionization injection, this scheme offers an order of magnitude smaller residual transverse momentum of the electron bunch, which is a result of the smaller vector potential amplitude of the injection pulse. © 2013 SPIE.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1602794
Journal Information:
Proceedings of SPIE - The International Society for Optical Engineering, Vol. 8779; Conference: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic
Publisher:
SPIECopyright Statement
Country of Publication:
United States
Language:
English

References (4)

Monoenergetic beams of relativistic electrons from intense laser–plasma interactions journal September 2004
A laser–plasma accelerator producing monoenergetic electron beams journal September 2004
Erratum: “Head-on injection of a high quality electron beam by the interaction of two laser pulses” [Phys. Plasmas 11, 3296 (2004)] journal September 2004
Physics of laser-driven plasma-based electron accelerators journal August 2009

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