Gamma-ray measurements in relativistic interactions with underdense plasmas

Year: 2001

Authors: Galimberti M., Giulietti A., Giulietti D., Gizzi LA., Borghesi M., Campbell HD., Schiavi A., Willi O.

Autors Affiliation: Intense Laser Irradiation Laboratory IFAM, Area della Ricerca CNR, Pisa (Italy;
Dipartimento di Fisica, Università di Pisa and INFM, Pisa, Italy;
The Queen’s University, Belfast BT7 iNN, UK;
Imperial College ofScience, Technology and Medicine, SW7 2BZ, London, UK

Abstract: Fast electrons generated during laser-plasma interactions at relativistic intensities can be studied directly using electron spectrometers, or indirectly, detecting the gamma-ray bremsstrahlung radiation generated by the interaction of these electrons with matter. In a recent experiment carried out at the Rutherford Appleton Laboratory using the Vulcan laser, the propagation of a 75 J, 1 ps Chirped Pulse Amplified pulse (CPA) in a preformed plasma channel was studied using a variety of diagnostic techniques. High energy gamma ray detectors based on NaI(TI) scintillator coupled to photomultipliers were used to detect bremsstrahlung emission from accelerated electrons. The gamma-my yield was studied for different plasma channel conditions by varying the delay between the channel forming pulse and the main CPA pulse. These results are correlated with the interferometric images of the plasma interaction region.


Volume: 4424      Pages from: 512  to: 515

KeyWords: laser-plasma interactions
DOI: 10.1117/12.425545

Citations: 2
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