In the framework of the CRYSTAL proposal for the pro- duction and studies of ordered beams, a direct imaging di- agnostics of longitudinal structures of ordered ions is now under development. The fundamental elements of the di- agnostics device are a thin foil, an accelerating grid, an RF camera and an imaging detector. The thin carbon foil is responsible for the direct production of time correlated electrons upon the arrival of ordered ions. The accelerating grid (10-15 kV) is used to enhance the time correlation of the electrons against the angular spread of emission. The accelerating grid is followed by the RF camera, working at 2.465 GHz, for the transverse deﬂection of the correlated electrons. A detector with spatial resolution around 50 micron is foreseen after a drift length of 30 cm. The time response of the thin carbon foil was investigated with a Monte Carlo method with particular emphasis to electrons with kinetic energies smaller than few hundreds eV. According to the adopted model, the time lags originated by the transport of the primary electrons through the thin foil are limited at few tens of femto-seconds.
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