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  Generation of MeV electrons and positrons with femtosecond pulses from a table-top laser system

Gahn, C., Tsakiris, G. D., Pretzler, G., Witte, K. J., Thirolf, P., Habs, D., et al. (2002). Generation of MeV electrons and positrons with femtosecond pulses from a table-top laser system. Physics of Plasmas, 9(3), 987-999. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHPAEN000009000003000987000001&idtype=cvips&gifs=Yes.

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 Creators:
Gahn, C.1, Author              
Tsakiris, G. D.1, 2, Author              
Pretzler, G.1, Author              
Witte, K. J.1, 2, Author              
Thirolf, P., Author
Habs, D.1, 2, Author              
Delfin, C., Author
Wahlstrom, C. G., Author
Affiliations:
1Laser Plasma Physics, Max Planck Institute of Quantum Optics, Max Planck Society, ou_1445567              
2Laboratory for Attosecond Physics, Max Planck Institute of Quantum Optics, Max Planck Society, ou_1445564              

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 Abstract: In experiments, the feasibility was demonstrated of generating multi-MeV electrons in a form of a collimated beam utilizing a table-top laser system delivering 200 fs pulses with PL=1.2 TW and 10 Hz capability. The method uses the process of relativistic self-channeling in a high-density gas jet producing electron densities in the range of 3x1019-6x1020 cm-3. In a thorough investigation, angularly resolved and absolutely calibrated electron spectra were measured and their dependence on the plasma density, laser intensity, and gas medium was studied. For the optimum electron density of ne=2x1020cm-3 the effective temperature of the electron energy distribution and the channel length exhibit a maximum of 5 MeV and 400 μm respectively. The laser-energy to-MeV- electron efficiency is estimated to be 5%. In a second step, utilizing the multi-MeV electron beam anti-particles, namely positrons, were successfully generated in a 2 mm Pb converter. The average intensity of this new source of positrons is estimated to be equivalent to a radioactivity of 2x108 Bq and it exhibits a very favorable scaling for higher laser intensities. (C) 2002 American Institute of Physics.

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Language(s): eng - English
 Dates: 2002-03
 Publication Status: Published in print
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 Rev. Type: Peer
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Title: Physics of Plasmas
  Alternative Title : Phys. Plasmas
Source Genre: Journal
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Pages: - Volume / Issue: 9 (3) Sequence Number: - Start / End Page: 987 - 999 Identifier: ISSN: 1070-664X