The Purpose of using Particle-in-Cell (PIC) computer models, we are exploring the feasibility of using relativistic plasma waves to accelerate electrons with gradients orders of magnitude higher than current technology provides. Various schemes being investigated are the Plasma Beat Wave, Laser Wakefield, Self-Modulated Laser Wakefield (Raman forward scattering), and the Particle Beam Wakefield concepts. Using modern parallel computers we can accurately model the full spatial and temporal scales of several ongoing laser-plasma accelerator experiments. This work is done in collaboration with the Neptune Lab projects at UCLA. In addition, we are exploring the use of plasmas to focus particle beams and to upshift existing sources of radiation. These new types of radiation sources have unique capabilities in regard to tunability and pulse compression in the GHz to 100THz frequency range.
|This work is supported by DOE grants DE-FG03-90ER40727 and DE- FG03-98DP00211, NSF grant DMS-9722121 and LLNL contract W-7405-ENG-48.|
(click for movie)
|Mutual attraction of laser beams in Plasmas: Braided light sorces|
|Simulations of E-157|
|Position wakes and Position acceleration|
|3-D wake structure|
|Electron beam hosing|
|100 MeV Beat wave example|
|Simulation of RAL 100MeV experiment|
|UCLA/ Plasma Beat Wave Acceleration Experiment|
|USC/Plasma Accelerator Group|
|E-157/ Plasma Wakefield Accelerator Collaboration|
|UCLA/ Particle Beam Physics Lab|
|Hemker, R.G., Tzeng, K-C., Mori,
W.B., Katsouleas, T., Clayton, C.E., "Computer simulations of cathodeless,
high-brightness electron beam production by multiple laser beams in plasmas," Physical Review E, Vol. 57, No. 5, pp. 5920-5928, May 1998.
Tzeng, K-C., Mori, W.B., Katsouleas, T., "Beam characteristics from laser-driven wavebreaking", Physical Review Letters, Vol. 79, No. 26, pp. 5258-5261, December 1997.
Gordon, D., Tzeng, K-C., Clayton, C.E., Dangor, A.E., Malka, V., Marsh, K.A., Modena, A., Mori, W.B., Muggli, P., Najmudin, Z., Neely, D., Danson, C., Joshi, C., "Observation of Electron Energies Beyond the Linear Dephasing Limit from a Laser-Excited Relativistic Plasma Wave," Physical Review Letters, Vol. 80., No. 10, pp. 2133-2136, March 1998.
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