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Using laser accelerated protons or ions for various applications - forexample in particle therapie or short-pulse radiographic diagnostics - requiresan effective method of focusing and energy selection. We derive an analyticalscaling for the performance of a solenoid compared with a doublet/triplet asfunction of the energy, which is confirmed by TRACEWIN simulations. The scalingshows that above a few MeV a solenoid needs to be pulsed or super-conducting,whereas the quadrupoles can remain conventional. The transmission of thetriplet is found only 25% lower than that of the equivalent solenoid. Bothsystems are equally suitable for energy selection based on their chromaticeffect as is shown using an initial distribution following the RPA simulationmodel by Yan et al.\cite{yan2009}.

Performance of solenoids vs. quadrupoles in focusing and energy selection of laser accelerated protons