The Mark-II vertex drift chamber

Abstract

We have completed constructing and begun operating the Mark II Drift Cham ber Vertex Detector. The chamber, based on a modified jel cell design, achieves HO ftm spatial resolution and < 1000 ;m track-pair resolution in pressurized <"(); gas mixtures. Special emphasis has been placed on controlling systematic errors including (lie use of novel construction techniques which permit accurate wire placement. Chamber performance has been studied with cosmic ray tracks col lected with the chamber located both inside and outside I he Mark II. Results on spatial resolution, average pulse shape, and some properties of (*()-.< mixtures fire presented. 1'resented 1 at the U'jre Chamber Confrrpncv Vje/ina. AtiMr/a. Feb. 13 IT. 198!)

Gaseous Radiation Detectors

“…Smaller cylindrical devices of similar design have been developed as vertex detectors; operated at pressures higher than atmospheric, they can reach localization accuracies of 50 µm or better (Mµller, 1986;Alexander et al, 1989). (Baranco Luque et al, 1980).…”