Multiwire proportional quantameters

Multiwire proportional chambers in the HERMESexperimentA

The multiwire proportional chambers of the HERMES spectrometer are described. The chambers are located in the spectrometer magnet gap which imposed strong constraints on their design. Non-ammable gas mixture of Ar(65%), CO 2 (30%) and CF 4 (5%) is successfully used with an eeciency plateau 500V wide. The readout is performed by means of the recently developed LeCroy PCOS4 acquisition system upg...

Interlaboratory Development of an Integrated Circuit for Multiwire Proportional Chambers

A Vertex Trigger based on Cylindrical Multiwire Proportional Chambers

This article describes the technical implementation and the performance of the zvertex trigger (CIP2k), which is part of the H1-experiment at HERA. The HERA storage ring and collider was designed to investigate electron (and positron) proton scattering at a center-of-mass energy of 320 GeV. To improve the sensitivity for detecting non-standard model physics and other high momentum transfer phen...

A multiwire proportional chamber for precision studies of neutron b decay angular correlations

A new multiwire proportional chamber (MWPC) was designed and constructed for precision studies of neutron b decay angular correlations. Its design has several novel features, including the use of low pressure neopentane as the MWPC gas and an entrance window made of thin Mylar sheet reinforced with Kevlar fibers. In the initial off-line performance tests, the gas gain of neopentane and the posi...

Development of backgammon-type multiwire proportional counters for the detection of x rays

A multiwire proportional counter !MWPC" based on a backgammon-type design has been developed for the detection of x-ray photons in two dimensions over the energy range of 4–6 keV. The MWPC was designed for operation in an experimental spectroscopy application requiring single photon counting over a wide range of count rates, high photon detection efficiency and resolution, and a highly linear r...