Status of Project GRAND's Proportional Wire Chamber Array

Details Status of Project GRAND's Proportional Wire Chamber Array Status of Project GRAND's Proportional Wire Chamber Array

2001-09-26

arxiv.org/abs/astro-ph/0109489v1

Astronomy and Astrophysics

Astrophysics

4 pages; 27th ICRC, p. 607

Scientific paper

Project GRAND is an extensive air shower array of proportional wire chambers. It has 64 stations in a 100m x 100m area; each station has eight planes of proportional wire chambers with a 50 mm steel absorber plate above the bottom two planes. This arrangement of planes, each 1.25 square meters of area, allow an angular measurement for each track to 0.25 degrees in each of two projections. The steel absorber plate allows a measurement of the identity of each muon track to 96% accuracy. Two data-taking triggers allow data to be simultaneously taken for a) extensive air showers (multiple coincidence station hits) at about 1 Hz and b) single muons (single tracks of identified muons) at 2000 Hz. Eight on-line computers pre-analyze the single track data and store the results on magnetic tape in compacted form with a minimum of computer dead-time. One additional computer reads data from the shower triggers and records this raw data on a separate magnetic tape with no pre-analysis.

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