Experimental results in laser acceleration of protons and ions and theoretical predictions that the currently achieved energies might be raised by factors 5-10 in the next few years have stimulated research exploring this new technology for oncology as a compact alternative to conventional synchrotron based accelerator technology. The emphasis of this paper is on collection and focusing of the laser produced particles by using simulation data from a specific laser acceleration model. We present a scaling law for the "chromatic emittance" of the collector-here assumed as a solenoid lens-and apply it to the particle energy and angular spectra of the simulation output. For a 10 Hz laser system we find that particle collection by a solenoid magnet well satisfies requirements of intensity and beam quality as needed for depth scanning irradiation. This includes a sufficiently large safety margin for intensity, whereas a scheme without collection-by using mere aperture collimation-hardly reaches the needed intensities. © 2011 American Physical Society.
Hofmann, I., Meyer-Ter-Vehn, J., Yan, X., Orzhekhovskaya, A., & Yaramyshev, S. (2011). Collection and focusing of laser accelerated ion beams for therapy applications. Physical Review Special Topics - Accelerators and Beams, 14(3). https://doi.org/10.1103/PhysRevSTAB.14.031304