  Multi Micro-Channel-Plate Photomultiplier tubes (MCP-PMT) with High
Collection Efficiency (Hi-CE) MCPs are developed and characterised. With these
Hi-CE MCPs more than 90% of photoelectrons emitted from the photocathode can be
detected; this is in contrast to conventional MCPs where about 50% of
photoelectrons are lost at the MCP stage. The drawback of the Hi-CE MCPs is a
small degradation of the transfer time spread (TTS). However for applications
where no sub-ns time resolution is required the implementation of Hi-CE MCPs is
extremely beneficial, as it improves the detection efficiency of the MCP-PMT
almost by a factor of two.
