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Two possible methods of optically injecting electrons into a plasma accelerator are the self-modulated laser wakefield accelerator (SMLWFA) and laser ionization and ponderomotive acceleration (LIPA). A magnetic selection scheme is proposed to select a narrow band of energies from the intrinsically broad beam produced by the SML-WFA. The scheme is analyzed using 2D particle-in-cell (PIC) simulations and 3 0 ray tracing. The effects of space charge on the ideal LIPA distribution are examined using full 3D PIC simulations.