The initial comparison of various concepts for the inner detector was accomplished using programs which contain parametric models of the detector performance for single charged tracks. We examined at the resolutions for tracking variables as a function of momentum and angle for each candidate detector and compared them with a similar model of the existing CLEO II detector. These studies gave the quick and reliable feedback necessary to optimize the conceptual design. In addition, this study identified potential problem areas to be addressed in a more complete simulation.
Once the rough design of the detector was specified by the track parameter
studies, a full Monte Carlo simulation of the tracking system was
performed. The simulation used the CLEO track reconstruction code DUET. It
deposited ionization in each device, smeared the ionization, added noise,
introduced multiple scattering from all the material traversed
including the gas and discrete wires,
and removed hits according to an efficiency table. The tracking code was then
asked to do the pattern recognition to find the appropriate hits on
each track
and then reconstruct the track parameters by fitting those hits.
This code was used to measure the single track parameters and to
measure the resolution and reconstruction efficiency for physics quantities
of simulated decays. Using this code we
were able to reproduce the present CLEO II track parameter and mass
resolutions and compare them with the CLEO III model.