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Trigger electronics for the Alice PHOS detector

✍ Scribed by Hans Müller; Rui Pimenta; Luciano Musa; Zhongbao Yin; Dieter Röhrich; Bernhard Skaali; Iouri Sibiriak; Dmitry Budnikov

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
409 KB
Volume
518
Category
Article
ISSN
0168-9002

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✦ Synopsis

The Photon Spectrometer of ALICE consists of 5 identical modules of 56 Â 64 PWO crystals with a total of 100 azimuthal coverage of the barrel. The electronics required for implementing both the L0 trigger for high luminosity p-p physics and the L1 trigger for high p T Pb+Pb physics has been studied. A full integration of the trigger logic into the detector's enclosure is based on analog transmission of fast trigger sums between stacks of front-end boards and triggerrouter units. The latter contain 112 digitizer channels of 10 bit, which are mapped into a single FPGA per trigger unit, covering areas of 24 Â 16 crystals. The running modes allow for Level-0 trigger at 800 ns and Level-1 at 6200 ns trigger latencies. The design and status of the PHOS trigger electronics are outlined.

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