Endcap Electromagnetic Calorimeter Research Articles

Test beam results for an endcap electromagnetic calorimeter for the SSC

We have tested a calorimeter test beam module intended to simulate the endcap electromagnetic calorimeter of the Solenoidal Detector Collaboration (SDC) experiment at the SSC. The test module is manufactured from scintillating tiles and is read out via 1 mm diameter wavelength shifting fibers with shower sampling at ∼ 1 radiation length intervals. The results of test beam calibration show that the calorimeter is linear to within 1% and has a resolution of (19.5 ± 0.1)%/√ E⊕(0.47%±0.05)% for energies up to 200 GeV. Test beam data show that non-uniform, longitudinal radiation damage to the calorimeter (up to ∼ 50% light loss at shower maximum) can be corrected, and the original linearity of the calorimeter can be recovered with only a small degradation of resolution. A “pre-shower detector” improves the charged π rejection by a factor of 2–3 at an electron detection efficiency greater than 97.5 ± 0.3%.

Performance of an endcap prototype of the ATLAS accordion electromagnetic calorimeter

The design and construction of a lead-liquid-argon endcap calorimeter prototype using an accordion geometry and conceived as a sector of the inner wheel of the endcap calorimeter of the future ATLAS experiment at the LHC is described. The performance obtained using electron beam data is presented. The main results are energy resolution with a sampling term below 11% E GeV and a small local constant term, good linearity of the response with the incident energy and a global constant term of 0.8% over an extended area in the rapidity range 2.2 < η < 2.9. These properties make the design suitable for the ATLAS electromagnetic endcap calorimeter.

Development studies for the OPAL end cap electromagnetic calorimeter using vacuum photo triode instrumented leadglass

A description is given of the OPAL end cap electromagnetic calorimeters which consist of leadglass instrumented with vacuum photo triodes. Test results are presented showing linearity, energy and position resolution measured in an electron beam whilst the calorimeter is subject to magnetic fields up to 1.0 T. The response to hadrons is also discussed. Finally, radiation damage and recovery of the leadglass is reported.

The Mark II detector for the SLC

The Mark II detector has been upgraded in preparation for its role as the first detector to take data at the Stanford Linear Collider. The new detector components include the central drift chamber, the time-of-flight system, the coil, the endcap electromagnetic calorimeters and the beam energy and luminosity measuring devices. There have also been improvements in detector hermeticity. All of the major components were installed for a test run at the PEP storage ring (√ s = 29 GeV) in 1985. This paper describes the upgraded detector, including its trigger and data acquisition systems, and gives performance figures for its components. Future improvements are also discussed.

A shower position detector inside an electromagnetic calorimeter

We present the results of a test in an electron-hadron beam (5–90 GeV) of the prototype of a position detector. This position detector consists of proportional tubes with charge division readout, giving the position and a coarse value of the shower energy. This detector will be used in the end cap electromagnetic calorimeter (bouchon) of the UA1 experiment (CERN p p collider). We give results on the properties of the tubes and on the development of the shower in the lead-plastic sandwhich.