Track chambers based on precision drift tubes housed inside 30 mm mylar pipe

Abstract

We describe drift chambers consisting of 3 layers of 30 mm (OD) drift tubes made of double sided aluminized mylar film with thickness 0.125 mm. A single drift tube is self-supported structure withstanding 350 g tension of 50 microns sense wire located in the tube center with 10 microns precision with respect to end-plug outer surface. Such tubes allow to create drift chambers with small amount of material, construction of such chambers doesn't require hard frames. Twenty six chambers with working area from 0.8 × 1.0 to 2.5 × 2.0 m 2 including 4440 tubes have been manufactured for experiments at 70-GeV proton accelerator at IHEP(Protvino).

Tracking chamber made of 15-mm mylar drift tubes

“…After construction of ATLAS about 5000 tubes (28 chambers) were assembled as demanded by experiments at 70-GeV accelerator of IHEP. As response to the desire of these experiments to get trackers with less material budget, 30-mm tubes with mylar 125 micrometers wall were developed (4400 tubes, 26 chambers with area from 1×1 up to 2×2.5 m 2 ) [3,4]. Next demand of IHEP experiments was the increasing of rate capability of drift tubes.…”