GeV electron beams from cm-scale channel guided laser wakefieldaccelerator

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Laser-wakefield accelerators (LWFA) can produce electricfields of order 10-100 GV/m suitable for acceleration of electrons torelativistic energies. The wakefields are excited by a relativisticallyintense laser pulse propagating through a plasma and have a phasevelocity determined by the group velocity of the light pulse. Twoimportant effects that can limit the acceleration distanceand hence thenet energy gain obtained by an electron are diffraction of the drivelaser pulse and particle-wake dephasing. Diffraction of a focusedultra-short laser pulse can be overcome by using preformed plasmachannels. The dephasing limit can be increased by operating at a lowerplasma density, since this results in an increase in ... continued below

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Nakamura,K.; Nagler, B.; Toth, Cs.; Geddes, C.G.R.; Schroeder,C.; Esarey, E. et al. February 20, 2007.

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Laser-wakefield accelerators (LWFA) can produce electricfields of order 10-100 GV/m suitable for acceleration of electrons torelativistic energies. The wakefields are excited by a relativisticallyintense laser pulse propagating through a plasma and have a phasevelocity determined by the group velocity of the light pulse. Twoimportant effects that can limit the acceleration distanceand hence thenet energy gain obtained by an electron are diffraction of the drivelaser pulse and particle-wake dephasing. Diffraction of a focusedultra-short laser pulse can be overcome by using preformed plasmachannels. The dephasing limit can be increased by operating at a lowerplasma density, since this results in an increase in the laser groupvelocity. Here we present detailed results on the generation of GeV-classelectron beams using an intense femtosecond laser beamand a 3.3 cm longpreformed discharge-based plasma channel [W.P. Leemans et al., NaturePhysics 2, 696-699 (2006)]. The use of a discharge-based waveguidepermitted operation at an order ofmagnitude lower density and 15 timeslonger distance than in previous experiments that relied on laserpreformed plasma channels. Laser pulses with peak power ranging from10-50 TW were guided over more than 20 Rayleigh ranges and high-qualityelectron beams with energy up to 1 GeV were obtained by channelling a 40TW peak power laser pulse. The dependence of the electron beamcharacteristics on capillary properties, plasma density,and laserparameters are discussed.

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  • Journal Name: Physics of Plasmas; Journal Volume: 14; Related Information: Journal Publication Date: 05/2007

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  • Report No.: LBNL--63078
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1063/1.2718524 | External Link
  • Office of Scientific & Technical Information Report Number: 929327
  • Archival Resource Key: ark:/67531/metadc895168

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 20, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 4:11 p.m.

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Nakamura,K.; Nagler, B.; Toth, Cs.; Geddes, C.G.R.; Schroeder,C.; Esarey, E. et al. GeV electron beams from cm-scale channel guided laser wakefieldaccelerator, article, February 20, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc895168/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.