Position-sensitive gas proportional chambers

• Main Authors: Morris, C L, Hoffmann, G W, Thiessen, H A
• Format: Conference Proceeding
• Language: English
• Published: United States 01.01.1977
• Subjects: 430303 - Particle Accelerators- Experimental Facilities & Equipment; 440104 - Radiation Instrumentation- High Energy Physics Instrumentation; ACCELERATOR FACILITIES; ACCELERATORS; COUNTING RATES; CYCLIC ACCELERATORS; DELAY CIRCUITS; DRIFT CHAMBERS; EFFICIENCY; ELECTRONIC CIRCUITS; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; LAMPF LINAC; LINEAR ACCELERATORS; MEASURING INSTRUMENTS; MESON FACTORIES; MULTIWIRE PROPORTIONAL CHAMBERS; OPERATION; PARTICLE ACCELERATORS; POSITION SENSITIVE DETECTORS; PROPORTIONAL COUNTERS; RADIATION DETECTORS; READOUT SYSTEMS; RESOLUTION; SPATIAL RESOLUTION
• ISSN: 0018-9499; 1558-1578

A number of multiwire, position-sensitive, gas proportional chambers have been constructed which use fast delay line (2.5 ns/cm) readouts to provide trajectory position and angle information for particles near the focal planes of the Energetic Pion Channel and Spectrometer (EPICS) and High Resolution Spectrometer (HRS) at the Clinton P. Anderson Meson Physics Facility (LAMPF). These chambers are two dimensional with anode wires in one direction and cathode wires in the other direction. When operated as ordinary delay line chambers, position resolution of 0.5 mm (FWHM) can be obtained in the cathode direction for short cathode wire lengths. If the drift information from the anodes is used, resolution of less than 0.35 mm (FWHM) can be obtained in this direction. The chambers can be operated at count rates of 5 x 10/sup 5/ pulses/sec with live times of greater than 90 percent. Efficiencies, measured at lower counting rates, are typically greater than 99 percent.