High resolution drift chambers

The HERMES Back Drift Chambers

The tracking system of the HERMES spectrometer behind the bending magnet consists of two pairs of large planar 6-plane drift chambers. The design and performance of these chambers is described. This description comprises details on the mechanical and electronical design, information about the gas mixture used and its properties, results on alignment, calibration, resolution, and e ciencies, and...

Drift and Proportional Tracking Chambers

Slow Control for Micromegas and Drift Chambers

A new spectrometer is being built for the COMPASS particle physics experiment at CERN. Saclay is in charge of the construction and the operation of two types of gaseous detectors: Micromegas microstrip detectors and Drift chambers [1], [2]. The operation of the detectors requires the slow control of high voltages and currents, and of the thresholds for the Front-End. This control system has bee...

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN–EP/99–101 15 July 1999 RATE EFFECTS IN HIGH-RESOLUTION DRIFT CHAMBERS

The impact of high counting rates on the spatial resolution of cylindrical drift tubes is investigated in detail and the results are compared with simulations. Electronics effects and space-charge effects are quantitatively analysed. A spatial resolution of σ < 80μm can be achieved even at rates as high as 1500 Hz/cm wire length (300 kHz per wire). a EP Division, CERN, CH–1211 Geneva 23, Switze...

The Drift Chambers Of The Nomad Experiment

We present a detailed description of the drift chambers used as an active target and a tracking device in the NOMAD experiment at CERN. The main characteristics of these chambers are a large area (3 × 3 m), a self supporting structure made of light composite materials and a low cost. A spatial resolution of 150 μm has been achieved with a single hit efficiency of 97% . 1 on leave from the Labor...