TY - JOUR
T1 - Energy enhancement and spectrum narrowing in terahertz electron sources due to negative mass instability
AU - Lurie, Yu
AU - Bratman, V. L.
AU - Savilov, A. V.
N1 - Publisher Copyright:
© 2016, American Physical Society. All rights reserved.
PY - 2016
Y1 - 2016
N2 - Simulations of coherent spontaneous undulator radiation in a waveguide demonstrate that the use of negative mass instability (NMI) for retaining longitudinal sizes of dense electron bunches, which are formed in laser-driven photoinjectors, allows one to increase power capabilities of a terahertz radiation source by many times. The NMI is realized in an undulator with combined helical and over-resonance uniform longitudinal magnetic fields due to nonisochronous longitudinal oscillations of electrons, whose frequencies increase/decrease with increasing/decreasing particle energy. In such conditions, an effective longitudinal size of the bunches can be preserved at long distance even at an extremely high electron density. Correspondingly, an energy extraction efficiency of more than 20% is revealed at a narrow frequency radiation spectrum, suggesting realization of a compact and powerful THz source.
AB - Simulations of coherent spontaneous undulator radiation in a waveguide demonstrate that the use of negative mass instability (NMI) for retaining longitudinal sizes of dense electron bunches, which are formed in laser-driven photoinjectors, allows one to increase power capabilities of a terahertz radiation source by many times. The NMI is realized in an undulator with combined helical and over-resonance uniform longitudinal magnetic fields due to nonisochronous longitudinal oscillations of electrons, whose frequencies increase/decrease with increasing/decreasing particle energy. In such conditions, an effective longitudinal size of the bunches can be preserved at long distance even at an extremely high electron density. Correspondingly, an energy extraction efficiency of more than 20% is revealed at a narrow frequency radiation spectrum, suggesting realization of a compact and powerful THz source.
UR - http://www.scopus.com/inward/record.url?scp=85011114092&partnerID=8YFLogxK
U2 - 10.1103/PhysRevAccelBeams.19.050704
DO - 10.1103/PhysRevAccelBeams.19.050704
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AN - SCOPUS:85011114092
SN - 2469-9888
VL - 19
JO - Physical Review Accelerators and Beams
JF - Physical Review Accelerators and Beams
IS - 5
M1 - 050704
ER -