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We report the results of a combined study of particle-in-cell and Monte Carlomodeling that investigates the production of Bremsstrahlung radiation producedwhen an ultraintense laser interacts with a tower-structured target. Thesetargets are found to significantly narrow the electron angular distribution aswell as produce significantly higher energies. These features combine to createa significant enhancement in directionality and energy of the Bremstrahlungradiation produced by a high-Z converter target. These studies employshort-pulse, high intensity laser pulses, and indicate that novel target designhas potential to greatly enhance the yield and narrow the directionality ofhigh energy electrons and $\gamma$-rays. We find that the peak $\gamma$-raybrightness for this source is 6.0$\times$10$^{19}$ ${\rms^{-1}mm^{-2}mrad^{-2}}$ at 10MeV and 1.4$\times$10$^{19}$ ${\rms^{-1}mm^{-2}mrad^{-2}}$ at 100MeV (0.1$\%$ bandwidth).

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Enhancing Bremsstrahlung Production From Ultraintense Laser-Solid Interactions With Front Surface Structures