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There are several constraints placed on the design of CLEO III.
They are:
-
The requirements of the new CESR IR clearly determine
that the inner detector must be replaced and that the maximum attainable
acceptance is determined by the 330 mrad line (93%of 4
) in
Fig. 
. This leaves adequate clearance
between CESR and CLEO III for a shared space for cabling and plumbing.
-
The new particle identification system must fit inside the existing CsI
calorimeter volume.
-
The new tracking system must allow space for the particle identification
system without compromising
the tracking performance or the total acceptance.
-
The barrel CsI calorimeter will remain intact but we may rework the endcap
calorimeter if it can be demonstrated to greatly enhance the quality of the
data.