ALFA detector before LHC Run 2
February 06, 2017
April 19, 2017
The operation experience with ATLAS ALFA detectors in the LHC environment during the Run 1 period has shown significant beam-induced heating. Subsequent comprehensive studies revealed that heating effects could be disastrous in the case of the larger beam intensities foreseen for higher luminosities in the LHC Run 2. During the first LHC long shutdown (LS1) all ALFA detectors were removed from the LHC tunnel and their covers – Roman Pots – underwent a geometry upgrade to minimize the impedance losses. It is shown that this modification, together with an addition of a system improving the internal heat transfer and an air cooling system, has significantly shifted the temperatures of ALFA detectors away from the critical limits throughout the LHC Run 2. Also ALFA trigger system has been considerably upgraded to keep trigger signals safely inside the Run 2 ATLAS latency budget and to minimize dead time. The hardware changes of the trigger system are also described.
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