Spatial resolution of thin-walled high-pressure drift tubes

A small prototype detector based on high pressure thin-walled tubes (straws) has been developed and its parameters have been studied on a bench at JINR, Dubna, and SPS at CERN. The inner diameter of the straws is 9.53 mm. The pressure of the active gas mixture Ar/CO(2) (80/20) was varied from 1 to 5 bar. The best spatial resolution achieved in this pressure range is similar to 40 mu m. Both the high efficiency and high rate capability are retained. (C) 2011 Published by Elsevier B.V

A prototype coordinate detector based on granulated thin-walled drift tubes

A prototype detector based on thin-walled segmented tubes has been developed and its parameters have been studied. The detector contains 360 registration channels with a straw diameter of 4 mm. The prototype' granularity is 4 cm(2) and the length of insensitive region due to straw internal elements is less than 5\% of its full sensitive area. Deterioration of the spatial resolution near these elements is observed for 1.0\% of the detector sensitive area. The time and spatial parameters of the detector do not differ from those of conventional tracking detectors based on drift tubes. (C) 2011 Published by Elsevier B.V