Study of lattice beams and their limitations

Luminosity from microscale accelerators for high energy physics place a high premium on bunch repetition rate and phase space density at the interaction point (IP). The NLC test accelerator (NLCTA) at SLAC was built to address such beam dynamics issues. Because an S-band, RF photoinjector has been installed together with a low-energy, high-resolving power spectrometer (LES), it is useful to explore alternatives to conventional scenarios that can be tested with minimal modifications. Interesting cases include producing simultaneous multiple bunches from the cathode in different formats such as a 2D planar matrix or 3D tensor beam made of smaller bunches or bunchlets that replace a higher charge bunch. We simulate interacting bunchlets n_ij or n_ijk coming from the cathode and passing through a solenoid that is either matched to the linac or on the LES focal plane at 5 MeV. Parmela calculations show mixed space charge and RF effects such as emittance increases for bunchlet charges summing to 50 pC.