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Scalings for radiation from plasma bubblesa)
a)Paper UI2 4, Bull. Am. Phys. Soc. 54, 299 (2009).
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View: Figures


Image of FIG. 1.
FIG. 1.

Various elliptic orbits of the form intersecting , and , and .

Image of FIG. 2.
FIG. 2.

The longitudinal momentum of an electron in the boosted frame as a function of position in the bubble in the laboratory frame, according to Eq. (20) for .

Image of FIG. 3.
FIG. 3.

Graph showing the variation of transverse momentum with transverse position in the bubble, for . The solid line shows the solution of Eq. (37) and the dashed line is the expanded solution, Eq. (38).

Image of FIG. 4.
FIG. 4.

Geometry of trajectory in laboratory frame of electron performing a circular arc trajectory with arbitrary radius , but which intercepts the points , and , and .

Image of FIG. 5.
FIG. 5.

(a) Graph of the on-axis spectral intensity, calculated from (i) the synchrotronlike spectrum given by Eq. (56), and (ii) Eq. (58) for a synchrotron spectrum emission by an electron with varying energy. (iii) shows a synchrotronlike spectrum with the same peak energy and amplitude as (ii), which a critical frequency and an amplitude of 0.69 of (i). (b) shows the spectra calculated using the code RADAMPELTRAC (Ref. 26) from (i) 17.3 (i.e., ) oscillations of an electron with Lorentz factor and transverse momentum in a radial electric field and (ii) an electron accelerating in a bubble to maximum transverse oscillations and energy of , . is the frequency of the drive laser (not included in the numerical modeling).

Image of FIG. 6.
FIG. 6.

The scaling of the critical energy of photons emitted in the plasma bubbletron as a function of the electron number density and the laser driver field strength parameter .

Image of FIG. 7.
FIG. 7.

The scaling of the spectral brightness of photons emitted by the plasma bubbletron as a function of the electron number density and the laser driver field strength parameter .


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Scitation: Scalings for radiation from plasma bubblesa)