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SUMMARY:Nanosecond Timing Resolution with the APV25
DTSTART;VALUE=DATE-TIME:20120503T180000Z
DTEND;VALUE=DATE-TIME:20120503T190000Z
DTSTAMP;VALUE=DATE-TIME:20130522T102401Z
UID:indico-contribution-4@cern.ch
DESCRIPTION:Speakers: Dr. FRIEDL\, Markus (Austrian Academy of Sciences (A
 T))\nIn an environment with high occupancy and continuous collisions\, con
 ventional readout of silicon strip detectors will lead to ambiguities in t
 he time domain. This problem can in principle be minimized by reducing the
  shaping time\, but that approach is limited by the noise penalty.\n\nThe 
 APV25 chip\, originally developed for the CMS experiment\, includes an on-
 chip switched capacitor filter performing a ``deconvolution'' on three con
 secutive samples of the shaped signal in order to narrow down the signal t
 o a single bunch crossing.\nUnfortunately\, this feature requires clock sy
 nchronous beam and thus cannot be used in case of quasi-continuous collisi
 ons which will occur in the future Belle II experiment at KEK (Japan). Non
 etheless\, multiple samples along the shaper output can be processed outsi
 de of the APV25 in order to determine both peak amplitude and timing of th
 e sampled signal regardless of the asynchronous relation between particle 
 and sampling\, achieving a time resolution of a few nanoseconds. Moreover\
 , the data processing can be performed in real-time using look-up tables i
 n an FPGA. This allows comparing the timing of each hit to the trigger tim
 ing and discarding off-time background immediately\, saving bandwidth\, pr
 ocessing power and storage capacity in the subsequent DAQ.\n\nApart from t
 he hit time finding\, the future readout module for the Belle II Silicon V
 ertex Detector will also perform pedestal subtraction\, common mode correc
 tion and zero suppression by FPGA firmware. In addition\, the incoming ana
 log data will be conditioned by a digital FIR filter. We will present the 
 concept\, existing prototypes\, results from several beam tests on various
  (mostly double-sided) silicon strip detectors and what is under construct
 ion for the Belle II experiment.\n\nhttp://indico.cern.ch/contributionDisp
 lay.py?contribId=4&sessionId=6&confId=154525
LOCATION:INFN Pisa
URL:http://indico.cern.ch/contributionDisplay.py?contribId=4&sessionId=6&c
 onfId=154525
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