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Title: Two-color ionization injection using a plasma beatwave accelerator

Abstract

Two-color laser ionization injection is a method to generate ultra-low emittance (sub-100 nm transverse normalized emittance) beams in a laser-driven plasma accelerator. A plasma beatwave accelerator is proposed to drive the plasma wave for ionization injection, where the beating of the lasers effectively produces a train of long-wavelength pulses. The plasma beatwave accelerator excites a large amplitude plasma wave with low peak laser electric fields, leaving atomically-bound electrons with low ionization potential. A short-wavelength, low-amplitude ionization injection laser pulse (with a small ponderomotive force and large peak electric field) is used to ionize the remaining bound electrons at a wake phase suitable for trapping, generating an ultra-low emittance electron beam that is accelerated in the plasma wave. Using a plasma beatwave accelerator for wakefield excitation, compared to short-pulse wakefield excitation, allows for a lower amplitude injection laser pulse and, hence, a lower emittance beam may be generated.

Authors:
 [1];  [1];  [1];  [2];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Shanghai Jiao Tong Univ. (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1548809
Alternate Identifier(s):
OSTI ID: 1426748
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 909; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Schroeder, C. B., Benedetti, C., Esarey, E., Chen, M., and Leemans, W. P. Two-color ionization injection using a plasma beatwave accelerator. United States: N. p., 2018. Web. doi:10.1016/j.nima.2018.01.008.
Schroeder, C. B., Benedetti, C., Esarey, E., Chen, M., & Leemans, W. P. Two-color ionization injection using a plasma beatwave accelerator. United States. doi:10.1016/j.nima.2018.01.008.
Schroeder, C. B., Benedetti, C., Esarey, E., Chen, M., and Leemans, W. P. Wed . "Two-color ionization injection using a plasma beatwave accelerator". United States. doi:10.1016/j.nima.2018.01.008.
@article{osti_1548809,
title = {Two-color ionization injection using a plasma beatwave accelerator},
author = {Schroeder, C. B. and Benedetti, C. and Esarey, E. and Chen, M. and Leemans, W. P.},
abstractNote = {Two-color laser ionization injection is a method to generate ultra-low emittance (sub-100 nm transverse normalized emittance) beams in a laser-driven plasma accelerator. A plasma beatwave accelerator is proposed to drive the plasma wave for ionization injection, where the beating of the lasers effectively produces a train of long-wavelength pulses. The plasma beatwave accelerator excites a large amplitude plasma wave with low peak laser electric fields, leaving atomically-bound electrons with low ionization potential. A short-wavelength, low-amplitude ionization injection laser pulse (with a small ponderomotive force and large peak electric field) is used to ionize the remaining bound electrons at a wake phase suitable for trapping, generating an ultra-low emittance electron beam that is accelerated in the plasma wave. Using a plasma beatwave accelerator for wakefield excitation, compared to short-pulse wakefield excitation, allows for a lower amplitude injection laser pulse and, hence, a lower emittance beam may be generated.},
doi = {10.1016/j.nima.2018.01.008},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
issn = {0168-9002},
number = ,
volume = 909,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nima.2018.01.008

Figures / Tables:

Figure 1 Figure 1: Example of PBWA-driven two-color ionization injection: normalized vector potentials of the beating CO2 lasers (red curve), the normalized vector potential of the ionization pulse (blue curve), the excited wakefield Ez/E0 (black curve), and the fraction of atoms ionized to Ne4+ (dashed black curve). The PBWA uses two linesmore » of a CO2 laser: 10.6 µm and 9.6 µm wavelengths. Each CO2 laser is linear-polarized, with a Gaussian profile, 3.5 ps (FWHM) duration, 140 µm spot size (ZR≃ 6 mm), 2 J of energy (a01 = 0.34 and a02 = 0.38), propagates in Ne gas, ionizing the gas to Ne3+, producing a plasma electron density of n0 = 1.3×1017 cm−3 and a wake. A frequency-doubled (0.4 µm wavelength) Ti:Al2O3 laser with ai = 0.057 (linear polarization), 60 fs duration (FWHM), delayed with respect to the CO2 pulses, ionizes to Ne4+ (Ui = 97.11 eV) and generates a trapped electron beam.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.