Abstract
We report on the development of radiation and electron sources based on laser-plasma acceleration for biomedical and nuclear applications, using both the table top TW laser at ILIL and the 220 TW FLAME laser system at LNF. We use the ILIL laser to produce wakefield electrons in a self-focusing dominated regime in a mm scale gas-jet to generate large, uniform beams of MeV electrons for electron radiography and radiobiology applications. This acceleration regime is described in detail and key parameters are given to establish reproducible and reliable operation of this source. We use the FLAME laser to drive laser-plasma acceleration in a cm-scale gas target to obtain stable production of >100 MeV range electrons to drive a Thomson scattering ɣ-ray source for nuclear applications.
Highlights
In the past decade, terawatt, table top laser systems based upon chirped pulse amplification (CPA) [1]have been successfully used in many laboratories worldwide to explore the laser-matter interaction regime in the ultra-short, ultraintense domain
We describe the experimental conditions on which plasma acceleration at ILIL is achieved using a moderate power laser system, to achieve acceleration of electron bunches with high charge and acceptable energy spread suitable for biomedical applications
In the first phase of Self-Injection Test Experiment (SITE), accelerated electron bunches were obtained from the interaction of the femtosecond laser pulse with a nitrogen supersonic-gas-jet working with a backing pressure of about 17 bar and a laser-intensity of 2×1018 W/cm2
Summary
Terawatt, table top laser systems based upon chirped pulse amplification (CPA) [1]have been successfully used in many laboratories worldwide to explore the laser-matter interaction regime in the ultra-short, ultraintense domain. Intense CPA pulses are considered for the fast-ignition [2] in inertial fusion energy and for the investigation of warm dense matter physics, through the interaction with solid targets [3,4]. These results are providing a strong motivation for the development of new laser infrastructures like. A similar scheme has been used in the demonstration of GeV acceleration of electrons [15] Most of these experiments require very high laser intensity and demanding installations, but compact laser systems can be successfully used to drive efficient laser-plasma electron sources with properties ideal for a wide range of applications
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