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Characterization of Sub-millimeter-scale Gas Cells as Possible Injectors for Staged Laser Wakefield Acceleration.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterization of Sub-millimeter-scale Gas Cells as Possible Injectors for Staged Laser Wakefield Acceleration./
Author:	Shaw, Jessica Leigh.
Description:	1 online resource (60 pages)
Notes:	Source: Masters Abstracts International, Volume: 74-10.
Contained By:	Masters Abstracts International74-10.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1535004click for full text (PQDT)
ISBN:	9781267979636

Characterization of Sub-millimeter-scale Gas Cells as Possible Injectors for Staged Laser Wakefield Acceleration.
Shaw, Jessica Leigh.

Characterization of Sub-millimeter-scale Gas Cells as Possible Injectors for Staged Laser Wakefield Acceleration. - 1 online resource (60 pages)

Source: Masters Abstracts International, Volume: 74-10.

Thesis (M.S.)--University of California, Los Angeles, 2013.

Includes bibliographical references

Recent experiments by Pollock et al. demonstrated ∼0.5 GeV electron beams with less than 5% FWHM energy spread using two-stage laser wakefield acceleration (LWFA). These experiments used a 3 mm long injector cell containing a helium-nitrogen mix followed by a 5 mm accelerator cell that contained only helium gas [1]. While these experiments have been qualitatively reproduced in particle-in-cell code simulations, optimization of the two-stage LWFA indicates that the highest energy gains (greater than 1 GeV) and the narrowest energy spreads should come when a much shorter (sub-millimeter-scale) injector stage is followed by a longer (centimeter-scale) accelerator stage [2]. In the Pollock et al. experiment, the use of such shorter injection cells did not produce accelerated electron beams from the Callisto laser at Lawrence Livermore National Laboratory [1]. This experimental observation raises the need to optimally design an ultra-thin gas cell with a particular emphasis on the entrance and exit holes for the laser beam. In this study, we present the development and characterization of a variable length, sub-millimeter injector cell and demonstrate that when well-characterized, few-TW laser pulses are used, it is possible to generate electron beams that are ideal for injection. This injector characterization shows that high electron energies up to 180 MeV can be achieved using a 280 μm injector with laser powers as low as 4.8 TW. Furthermore, it demonstrates 100 MeV electrons produced at 4.0 TW from injectors as short as 180 μm. Simulations of this specific injector design verify the results of this characterization. Therefore, this experimental work shows that injectors can perform as indicated by simulations and can produce adequate charge with high energies even for modest laser powers. Based on this performance, the injector cell developed for this study can be integrated into future experiments pursuing GeV-class electron beams from two-stage LWFA.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781267979636Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Electron beamIndex Terms--Genre/Form:

542853
Electronic books.

Characterization of Sub-millimeter-scale Gas Cells as Possible Injectors for Staged Laser Wakefield Acceleration.
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502 $a Thesis (M.S.)--University of California, Los Angeles, 2013.
504 $a Includes bibliographical references
520 $a Recent experiments by Pollock et al. demonstrated ∼0.5 GeV electron beams with less than 5% FWHM energy spread using two-stage laser wakefield acceleration (LWFA). These experiments used a 3 mm long injector cell containing a helium-nitrogen mix followed by a 5 mm accelerator cell that contained only helium gas [1]. While these experiments have been qualitatively reproduced in particle-in-cell code simulations, optimization of the two-stage LWFA indicates that the highest energy gains (greater than 1 GeV) and the narrowest energy spreads should come when a much shorter (sub-millimeter-scale) injector stage is followed by a longer (centimeter-scale) accelerator stage [2]. In the Pollock et al. experiment, the use of such shorter injection cells did not produce accelerated electron beams from the Callisto laser at Lawrence Livermore National Laboratory [1]. This experimental observation raises the need to optimally design an ultra-thin gas cell with a particular emphasis on the entrance and exit holes for the laser beam. In this study, we present the development and characterization of a variable length, sub-millimeter injector cell and demonstrate that when well-characterized, few-TW laser pulses are used, it is possible to generate electron beams that are ideal for injection. This injector characterization shows that high electron energies up to 180 MeV can be achieved using a 280 μm injector with laser powers as low as 4.8 TW. Furthermore, it demonstrates 100 MeV electrons produced at 4.0 TW from injectors as short as 180 μm. Simulations of this specific injector design verify the results of this characterization. Therefore, this experimental work shows that injectors can perform as indicated by simulations and can produce adequate charge with high energies even for modest laser powers. Based on this performance, the injector cell developed for this study can be integrated into future experiments pursuing GeV-class electron beams from two-stage LWFA.
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