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17 Nov 2008

Volume 93, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 93, 201101 (2008); http://dx.doi.org/10.1063/1.3025818 (3 pages)

W. Dai and C. M. Soukoulis
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Magnetic steering of a helicon double layer thruster

C. Charles, R. W. Boswell, W. Cox, R. Laine, and P. MacLellan

Appl. Phys. Lett. 93, 201501 (2008); http://dx.doi.org/10.1063/1.3033201 (3 pages) | Cited 7 times

Online Publication Date: 19 November 2008

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The ion beam generated by a helicon double layer has been electrically steered up to 20° off axis by using a solenoid placed normal to the two axial solenoids of the helicon plasma source without significantly changing the beam exhaust velocity.
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52.75.Di Ion and plasma propulsion
52.27.-h Basic studies of specific kinds of plasmas

Controlled electron injection into laser wakefields with a perpendicular injection laser pulse

W.-M. Wang, Z.-M. Sheng, and J. Zhang

Appl. Phys. Lett. 93, 201502 (2008); http://dx.doi.org/10.1063/1.3020301 (3 pages) | Cited 6 times

Online Publication Date: 20 November 2008

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Electron injection into laser wakefields for acceleration by two orthogonally directed laser pulses is investigated theoretically. It is found that efficient injection occurs provided the two pulses are collinearly polarized, even if the injection pulse is much weaker than the pump pulse driving wakefields. Compared with the head-on colliding injection geometry, this scheme allows for a shorter propagation distance less than a Rayleigh length for the injection pulse, before its overlapping with the pump pulse. Moreover, it can generate electron beams stably with comparable low energy spread and emittance, as demonstrated by particle-in-cell simulations. The optimization of laser parameters is also investigated.
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.65.Rr Particle-in-cell method

Directional properties of hard x-ray sources generated by tightly focused ultrafast laser pulses

Bixue Hou, Aghapi Mordovanakis, James Easter, Karl Krushelnick, and John A. Nees

Appl. Phys. Lett. 93, 201503 (2008); http://dx.doi.org/10.1063/1.3023065 (3 pages) | Cited 5 times

Online Publication Date: 20 November 2008

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Directional properties of ultrafast laser-based hard x-ray sources are experimentally studied using tightly focused approximately millijoule laser pulses incident on a bulk Mo target. Energy distributions of Kα and total x rays, as well as source-size distributions are directionally resolved in vacuum and in flowing helium, respectively. Directional distributions of x-ray emission is more isotropic for p-polarized pump than for s-polarized. Based on source-size measurements, a simple two-location model, with expanded plasma and bulk material, is employed to represent the x-ray source profile.
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52.59.Px Hard X-ray sources
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.38.Ph X-ray, γ-ray, and particle generation
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