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Our experiments produced betatron x-rays up to 80 keV from a laser-wakefield accelerator. Measurements, performed with stacked image plates spectrometers, provide simultaneous information on the beam profile and spectrum at various angles of observation.
A train of multiterawatt, 3 ps CO2 laser pulses is used for proton acceleration in a plasma at the critical density. Maximum energy of ions is strongly affected by a temporal structure of the pulse.
15TW picosecond 10μm laser pulses are obtained at the UCLA Neptune Laboratory achieving record CO2 laser power. This peak power opens unique opportunities for applications in high-field experiments in the mid-IR range.
A high-power, single pass seeded FEL amplifier driven by a photoinjector is being built at the Neptune Laboratory at UCLA. A narrow-band seed pulse in the 0.5–3 THz range is generated by difference-frequency mixing of CO2 laser lines in a GaAs nonlinear crystal.
2 kW, 200 ns pulses were produced in a noncollinear phase-matched GaAs crystal. The terahertz source tunable in the range 0.5-3.0 THz with a step of 40 GHz is pumped by a dual-beam TEA CO2 laser.
High-intensity short-pulse laser guiding in plasma channels has extended the length over which acceleration occurs in laser wake field accelerators[1]. Recent multidimensional nonlinear plasma wave theory[2] predicts a range of optimal characteristics for self-guiding of laser pulses in the blowout regime for pulses shorter than a plasma wavelength. This theory predicts a robust, stable parameter...
The costs and the time scales of colliders intended to reach the energy frontier are such that it is important to explore new methods of accelerating particles to high energies. Plasma-based accelerators are particularly attractive because they are capable of producing accelerating fields that are orders of magnitude larger than those used in conventional colliders. In these accelerators a drive beam,...
2 kW, 200 ns pulses were generated in a noncollinear phase-matched GaAs crystal at room temperature. A terahertz source in the range 0.5-3.0 THz with a step of 40 GHz is pumped by line-tunable CO2 lasers.
A plasma heatwave accelerator with a gradient /spl sim/1.3 GeV/m is presented. It is shown that for diffraction limited plasmas, when efficiency of the plasma wave excitation is restricted by ionization-induced refraction, acceleration of electrons is enhanced by using asymmetric, long pulses.
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