A demultiplexer for use with the dynamic crossed-field photomultiplier

A mechanism was investigated which would permit time division demultiplexing of the output of a Dynamic Crossed-Field Photomultiplier (DCFP). The mechanism would be an integral part of the device. Demultiplexing is achieved with the use of a crossed field deflection mechanism which directs electron bunches to any one of a set of microstrip collectors. The deflection mechanism uses a divided drift region, consisting of a gap and an active drift region. A dc electric field in the gap injects electron bunches, emitted from the DCFP multiplication region, into the active drift region. In the active drift region, dc and RF electric fields are used to direct each electron bunch to a broadband collector structure. The collectors are 50 ohm shielded microstrips, terminated in an open circuit. The deflection mechanism has been modeled and its deflection characteristics studied as a function of all relevant field and structural parameters.