| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1829158 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2008 | 4 Pages |
Abstract
A new threshold Cherenkov detector using silica aerogel radiators is in operation in the DIRAC-II experiment at CERN. A duplex design was chosen to discriminate between kaons and protons in the momentum range 4–8 GeV/c. The counter consists of overlapping modules with two different refractive indices, 1.015 and 1.008, covering the low and high momentum regions, respectively. We developed a new design of alternating layers of aerogel tiles and diffusive reflector foils coated with wavelength shifter to improve light collection in the aerogel. A pyramidal shape of the aerogel radiator was also adopted for best signal uniformity over a large sensitive area. We report on the detector status and its performance in the DIRAC 2007 run.
Related Topics
Physical Sciences and Engineering
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Instrumentation
Authors
Y. Allkofer, C. Amsler, S. Horikawa, C. Regenfus, J. Rochet,