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Proceedings Paper

Generation of self-focused electron beam by pyroelectric/photogalvanic crystal accelerators
Author(s): N. V. Kukhtarev; T. V. Kukhtareva; G. Stargell; V. Samoilov; V. Razbudey
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Paper Abstract

We have observed generation of the electron beam by the pyroelectric crystal placed in the vacuum chamber. Different pyroelctric materials, Fe-doped LiNbO3 and L-alanine doped TGS crystals, were tested. Crystals of L-alanine doped TGS (LATGS) were grown by evaporation of the solution with 10% initial concentration of L-alanine under T=45°C (somewhat below phase transition temperature TC = 49.9°C). In this case crystallization proceeds immediately in the polar phase Heating/cooling cycles of the crystals in the vacuum (P~ 1-5 mTorr) produce uncompensated surface charges and strong electric field (~ 100kV/cm) on the polar crystal faces. These fringing fields ionize ambient gas and accelerate electrons to high energies (~100 KeV). For photosensitive LiNbO3 crystal electrical charging and generation of electrons may be done by laser illumination, via photogalvanic effect. These generated electrons can be detected by the fluorescent ZnS screen or by the X-rays produced by placing copper plate in the electron beam. Model that explains and figures that depict the self-focusing of the electron beam is presented.

Paper Details

Date Published: 25 August 2008
PDF: 8 pages
Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 70561O (25 August 2008); doi: 10.1117/12.796551
Show Author Affiliations
N. V. Kukhtarev, Alabama A&M Univ. (United States)
T. V. Kukhtareva, Alabama A&M Univ. (United States)
G. Stargell, Alabama A&M Univ. (United States)
V. Samoilov, Institute of Physics (Ukraine)
V. Razbudey, Institute of Nuclear Physics (Ukraine)

Published in SPIE Proceedings Vol. 7056:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II
Shizhuo Yin; Ruyan Guo, Editor(s)

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