| Paper |
Title |
Page |
| MOPC083 |
Flat Long Pulse Train Formation Using Multi-pass Structure
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250 |
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- J. Ruan, H. T. Edwards, R. P. Fliller
Fermilab, Batavia, Illinois
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Flat long pulse train is part of the requirements for International Linear collider. Here in Fermilab the construction of ILCTA at New Meon Lab will present the similar requirements (3MHz, 2810 Pulses, 5Hz) for the laser systems. In this paper we will report the effort to develop a new multi pass (MP) cavity based on Nd:YLF crystal end-pumped by diode laser. It takes a seed (1054 nm, 4-5ps) from a commercial laser and has a gain of 1000 or more. So far we already tested up to 1000 pulses with 1μs spacing and the pulse train amplitude fluctuation is less than 5% throughout the whole duration. We attribute this to the high optical to optical conversion efficiency achieved using Nd:YLF crystal inside the multi-pass structure. Test with 3MHz spacing train is also discussed and the integration of the new MP cavity into the current laser system is planned.
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| MOPC084 |
A Laser-driven Acceleration Method
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253 |
| |
- L. Torrisi, S. Gammino, D. Margarone
INFN/LNS, Catania
- A. Borrielli, F. Caridi
INFN & Messina University, S. Agata, Messina
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A laser ion source (LIS) has been obtained with a repetitive pulsed laser at power density of the order of 1010 W/cm2 or higher, with pulse duration of the order of ns and repetition rate of the order of tens Hz. Any solid target can be ablated producing plasma with equivalent temperatures higher than 100 eV, densities higher than 1017/cm3 and charge states higher than 10+. Extracted current densities can be higher than 10 mA/cm2. The study of the electric fields generated inside the non equilibrium plasmas is a by-product of the research in ion generation. Ions are emitted from the plasma in the direction of the electric field with energies of the order of 50 eV/nucleon or higher, depending on the laser intensity. Emitted ions have a Boltzmann ion energy distribution depending on the ion charge state. Previous papers show that the electric field is as high as 10 MV/cm in our case. Magnetic trapping of electrons has been used to increase the ion acceleration, focusing and current. This new ion acceleration method based on LIS seems to be very interesting because it may permit to build accelerators with small dimensions and relatively low cost.
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