Time-to-Distance Relationship
for the D0 Proportional Drift Tubes PDTs
using Garfield

Bernardo Gomez
Universidad de los Andes
July 24, 2001

Abstract

A detailed computer simulation of a cell of the D0 proportional drift tube
chambers PDTs was run to derive a relation for the muon hit position at
cell midplane as a function of the incident muon track angle and of the
measured electron drift time. A fourth order polynomial function of angle
and of drift time was fitted to the X(T) simulated data. For the computer
simulation Garfield, a simulation program for drift chambers, was applied
to the PDTs operating with the new gas mixture for Run II.

Using the same software and methods, calculations were performed for the old
gas used with the PDTs during Run I and compared with cosmic rays
measurements. Within the experimental error the simulation coincides with
the measured data.

For the present gas mixture the calculations performed with Garfield should
be compared with real measurements with cosmic rays passing through PDTs
at well defined angles.