The basic design of the detector may be improved with techniques which still need feasibility studies. These will be made in a PS test beam in September 1997 [53].
We will describe in the following a number of the options which will be studied in the tests.
Figure:
The efficiency in CHORUS as a function of the predicted event vertex position.
The reduction of events for larger depth into the target stack is attributed
to event reconstruction losses.
This interpretation is supported by the constant ratio of predicted and
found events as function of the depth.