Resonant Excitation of Selected Modes by a Train of Electron Bunches in a Rectangular Dielectric Wakefield Accelerator

External injection of electron bunches into laser-driven plasma waves so far has not resulted in ‘controlled’ acceleration, i.e. production of bunches with well-defined energy spread. Recent simulations, however, predict that narrow distributions can be achieved, provided the conditions for properly trapping the injected electrons are met. Under these conditions, injected bunch lengths of one to several plasma wavelengths are acceptable. This paper first describes current efforts to demonstrate this experimentally, using state-of-the-art radio frequency technology. The expected charge accelerated, however, is still low for most applications. In the second part, the paper addresses a number of novel concepts for significant enhancement of photo-injector brightness. Simulations predict that, once these concepts are realized, external injection into a wakefield accelerator will lead to accelerated bunch specs comparable to those of recent ‘laser-into-gasjet’ experiments, without the present irreproducibility of charge and final energy of the latter.

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Properties of Trapped Electron Bunches in a Plasma Wakefield Accelerator

10.2172/968512 ◽

2009 ◽

Author(s):

Neil Kirby

Keyword(s):

Electron Bunches ◽

Plasma Wakefield Accelerator ◽

Plasma Wakefield ◽

Wakefield Accelerator ◽

Trapped Electron

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Probing plasma wakefields using electron bunches generated from a laser wakefield accelerator

Plasma Physics and Controlled Fusion ◽

10.1088/1361-6587/aaabfd ◽

2018 ◽

Vol 60 (4) ◽

pp. 044013 ◽

Cited By ~ 3

Author(s):

C J Zhang ◽

Y Wan ◽

B Guo ◽

J F Hua ◽

C-H Pai ◽

...

Keyword(s):

Electron Bunches ◽

Laser Wakefield ◽

Wakefield Accelerator ◽

Laser Wakefield Accelerator

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RECENT STRUCTURE BASED HIGH GRADIENT WAKEFIELD EXPERIMENTS AT ARGONNE

International Journal of Modern Physics B ◽

10.1142/s0217979207042148 ◽

2007 ◽

Vol 21 (03n04) ◽

pp. 372-377

Author(s):

W. GAI ◽

M. E. CONDE ◽

F. GAO ◽

C. JING ◽

R. KONECNY ◽

...

Keyword(s):

Dielectric Constant ◽

Electron Beam ◽

Output Coupler ◽

High Field ◽

Bunch Length ◽

Accelerator Facility ◽

Dielectric Tube ◽

Electron Bunches ◽

Dielectric Structures ◽

Wakefield Accelerator

Dielectric structures promise to support high field, especially for short wakefield pulses produced by a high charged electron beam traveling in a dielectric tube. To push the gradient higher, we have tested two structures using recent upgraded Argonne wakefield accelerator facility that capable of producing up to 100 nC charge and bunch length of < 13 ps (FWHM). Here we report on the experiment results that more than 80 nC beam passes through a 14 GHz dielectric loaded wakefield structure that produced an accelerating field of ~ 45 MV/m . The two structures consist of a cylindrical ceramic tube (cordierite) with a dielectric constant of 5, inner and outer radii of 5 mm and 7.49 mm, respectively, and with length of 102 mm and 23 mm long. We present measurements made with single electron bunches and also with two bunches separated by 1.5 ns. As a next step in these experiments, another structure, with an output coupler, has been designed and is presently being fabricated.

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Transport of ultra-short electron bunches in a free-electron laser driven by a laser-plasma wakefield accelerator

10.1117/12.820455 ◽

2009 ◽

Cited By ~ 11

Author(s):

M. P. Anania ◽

D. Clark ◽

S. B. van der Geer ◽

M. J. de Loos ◽

R. Isaac ◽

...

Keyword(s):

Laser Plasma ◽

Free Electron ◽

Free Electron Laser ◽

Electron Bunches ◽

Plasma Wakefield Accelerator ◽

Plasma Wakefield ◽

Wakefield Accelerator

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Electron bunch injection at an angle into a laser wakefield

Laser and Particle Beams ◽

10.1017/s0263034609000093 ◽

2009 ◽

Vol 27 (1) ◽

pp. 69-77 ◽

Cited By ~ 10

Author(s):

M.J.H. Luttikhof ◽

A.G. Khachatryan ◽

F.A. van Goor ◽

K.-J. Boller ◽

P. Mora

Keyword(s):

Laser Pulse ◽

Electron Bunch ◽

Extensive Study ◽

Energy Spread ◽

Pulse Dynamics ◽

Electron Bunches ◽

Vacuum Plasma ◽

Laser Wakefield ◽

External Injection ◽

Wakefield Accelerator

AbstractExternal injection of electron bunches longer than the plasma wavelength in a laser wakefield accelerator can lead to the generation of femtosecond ultra relativistic bunches with a couple of percent energy spread. Extensive study has been done on external electron bunch (e.g., one generated by a photo-cathode RF linac) injection in a laser wakefield for different configurations.In this paper, we investigate a new way of external injection where the electron bunch is injected at a small angle into the wakefield. This way one can avoid the ponderomotive scattering as well as the vacuum-plasma transition region, which tend to destroy the injected bunch. In our simulations, the effect of the laser pulse dynamics is also taken into account. It is shown that injection at an angle can provide compressed and accelerated electron bunches with less than 2% energy spread. Another advantage of this scheme is that it has less stringent requirements in terms of the size of the injected bunch and there is the potential to trap more charge.

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