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Title: Plasma Photocathode Beam Brightness Transformer for Laser-Plasma Wakefield Accelerators

Authors:
 [1]
  1. RadiaBeam Technologies, LLC, Santa Monica, CA (United States)
Publication Date:
Research Org.:
RadiaBeam Technologies, LLC, Santa Monica, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1279841
Report Number(s):
DOE-RBT-9533
DOE Contract Number:
SC0009533
Type / Phase:
SBIR
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Andonian, Gerard. Plasma Photocathode Beam Brightness Transformer for Laser-Plasma Wakefield Accelerators. United States: N. p., 2016. Web.
Andonian, Gerard. Plasma Photocathode Beam Brightness Transformer for Laser-Plasma Wakefield Accelerators. United States.
Andonian, Gerard. Tue . "Plasma Photocathode Beam Brightness Transformer for Laser-Plasma Wakefield Accelerators". United States. doi:.
@article{osti_1279841,
title = {Plasma Photocathode Beam Brightness Transformer for Laser-Plasma Wakefield Accelerators},
author = {Andonian, Gerard},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 02 00:00:00 EDT 2016},
month = {Tue Aug 02 00:00:00 EDT 2016}
}

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  • We study the energetics of wake excitation during the laser-plasma interaction in application to laser wakefield accelerators. We find that both the wake amplitude and the accelerating efficiency (transformer ratio) can be maximized by properly shaping the longitudinal profile of the driving laser pulse. The corresponding family of laser pulse shapes is derived in the nonlinear regime of laser-plasma interaction. Such shapes provide theoretical upper limit on the magnitude of the wakefield and efficiency by allowing for uniform photon deceleration inside the laser pulse. We also construct realistic optimal pulse shapes that can be produced in finite-bandwidth laser systems.
  • Modeling of laser-plasma wakefield accelerators in an optimal frame of reference [1] is shown to produce orders of magnitude speed-up of calculations from first principles. Obtaining these speedups requires mitigation of a high frequency instability that otherwise limits effectiveness in addition to solutions for handling data input and output in a relativistically boosted frame of reference. The observed high-frequency instability is mitigated using methods including an electromagnetic solver with tunable coefficients, its extension to accomodate Perfectly Matched Layers and Friedman's damping algorithms, as well as an efficient large bandwidth digital filter. It is shown that choosing theframe of the wakemore » as the frame of reference allows for higher levels of filtering and damping than is possible in other frames for the same accuracy. Detailed testing also revealed serendipitously the existence of a singular time step at which the instability level is minimized, independently of numerical dispersion, thus indicating that the observed instability may not be due primarily to Numerical Cerenkov as has been conjectured. The techniques developed for Cerenkov mitigation prove nonetheless to be very efficient at controlling the instability. Using these techniques, agreement at the percentage level is demonstrated between simulations using different frames of reference, with speedups reaching two orders of magnitude for a 0.1 GeV class stages. The method then allows direct and efficient full-scale modeling of deeply depleted laser-plasma stages of 10 GeV-1 TeV for the first time, verifying the scaling of plasma accelerators to very high energies. Over 4, 5 and 6 orders of magnitude speedup is achieved for the modeling of 10 GeV, 100 GeV and 1 TeV class stages, respectively.« less