Experimental Elementary Particle Physics
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Arizona Atlas

The Forward Calorimeter Prototype 1993

The first prototype of a new liquid argon/copper sampling calorimeter with thin gaps of active material, originally designed by our group at the University of Arizona in 1992/93 for application in the highly radiative forward region of the meanwhile defunct GEM detector at the SSC, featured 192 tube electrodes (rod and tube assemblies forming a 250 micron tubular shell gap). This small device was mainly built for basic proof of principle of this novel readout geometry. It had insufficient depth coverage (only about 14 radiation lengths), and featured a sensitive volume just about big enough to contain electromagnetic showers laterally. Even within these restrictions it showed excellent performance in two electron testbeams 1993, the first at the Brookhaven National Laboratory's AGS in summer that year with beam energies between 2 and 8 GeV, and the second with high energy electrons (20 to 200 GeV) at the European center of high energy physics, CERN. Results from these experiments are published in Nucl. Instr. Meth. A383 (1996) 399-408 . Based on these experiences, this calorimeter design was finally accepted by ATLAS as the base line for a forward calorimeter, after the SSC project was canceled in fall 1993.

ATLAS prototype forward calorimeter

The ATLAS prototype forward calorimeter is shown being inserted into its cryostat at Brookhaven

 CERN fixed target site during the testing fo prototype.

Arizona Undergraduate student Lyle Harlow and group staff member Leif Shaver are shown at the CERN fixed target site during the testing of the ATLAS forward calorimeter prototype.


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