D(phi) vertex drift chamber construction and test results

摘要

A jet-cell based vertex chamber has been built for the D(O) experiment at Fermilab and operated in a test beam there. Low drift velocity and diffusion properties were achieved using CO(sub 2)(95%)-ethane(5%) at atmospheric pressure. The drift velocity is found to be consistent with (9.74+8.68(E-1.25)) (mu)m/nsec where E is the electric field strength in (kV/cm