A new cylindrical low-mass central drift chamber has been constructed for the K + ! + experiment at BNL (E787). The chamber consists of 12 layers of axial wire cells and 6 layers of thin cathode-strip foils, four of which are supported by diierential gas pressure. The momentum resolution (RMS) for muons and pions in the range 150 to 250 MeV/c is found to be about 0.9%.

An accurate determination of the “time-of-flight” in swarm experiments with a parallel plate drift chamber requires that the time evolution of the charge induced on the collector is linear. This is obtained in very large chambers where the edge effects can be neglected. However, the experimental conditions of high-mobility carriers and highly pressurized gases impose some constraints on the acc...

Drift chambers are now used in a lmost every h igh energy physics experiment. There are many different designs of drift chambers and one of them uses straw tubes as detector elements [1]. In this article, we repor t the design, construct ion, and per formance of large straw tube drift chambers used in the spect rometer a rm of E735 at the Fermi lab collider. E735 is an exper iment to s tudy low...

In this note we present a mathematical framework for a rigorous approach to a common track fit for trackers located in the inner region of the ZEUS detector. The approach makes use of the Kalman filter and offers a rigorous treatment of magnetic field inhomogeneity, multiple scattering and energy loss. We describe mathematical details of the implementation of the Kalman filter technique with a ...

An analysis based on the Green’s function for the diffusion equation indicates that the BaBar drift chamber could be purged of air down to 1 ppm in 8 hours with a purge gas velocity in the chamber of 0.043 cm/s, corresponding to one volume change every 2 hours. Anecdotal evidence from CLEO and ALEPH supports this claim. • It is proposed that the gas be fed into the chamber through 64 holes of 1...

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The Mark II experiment first started taking data in 1978 at the SLAC SPEAR storage ring. It was the first e+edetector with a large, many layer cylindrical drift chamber (CDC) and a large liquid argon calorimeter!” After two years at SPEAR, it was moved to the PEP storage ring, where it was upgraded a year later with a seven layer precision vertex drift chamber!’ located between the CDC and the ...

It has been proposed that the outer cylinder of the drift chamber be changed from 1.6 mm carbon fiber (0.6% X0) to 2.5 mm aluminum (2.5% X0). While such a change would have only a slight effect on the barrel CsI calorimeter performance, the question has been raised as to how it might affect the DIRC. Multiple scattering in the outer cylinder would cause as uncertainty in the entrance angle and ...

Gyroscope is one of the primary sensors for air vehicle navigation and controls. This paper investigates the noise characteristics of microelectromechanical systems (MEMS) gyroscope null drift and temperature compensation. This study mainly focuses on temperature as a long-term error source. An in-house-designed inertial measurement unit (IMU) is used to perform temperature effect testing in th...