Tracking Triggers. Fabrizio Palla INFN Pisa. The Tracker and the Trigger. Trigger rates control is extremely challenging in high luminosity hadron collider experiments As the luminosity increases, physics goals change in response to new discoveries and the detector ages.
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Main problem: input Bandwidth
divide the detector in thin fsectors.
Each AM searches in a small Df
1 AM for each enough-small Df
Hits: position+time stamp
All patterns inside a single chip
N chips for N overlapping events
(identified by the time stamp)
10 sensors layers
Stacked 15 sensors layers
Smaller a = greater pT
Smaller width = greater pT
Discrimination of low pT tracks made directly on the strip detector by choosing suitable pitch values in the usual range for strip sensors.
For both L1 & L2AM chips from 1992 to 2005
On the opposite side: FPGA for the same AMchip
P. Giannetti et al. “A Programmable Associative Memory for TrackFinding”, Nucl. Intsr. and Meth., vol. A413/2-3, pp.367-373,(1998).
In the middle: Standard Cell 0.18 mm
(INFN-Pisa) 5000 pattern/chip AMchip
L.Sartori, A. Annovi et al., “A VLSI Processor for Fast Track Finding Based on Content Addressable Memories”,
IEEE Transactions on Nuclear Science, Volume 53, Issue 4, Part 2, Aug. 2006 Page(s):2428 - 2433
Plan to increase the frequency to 200 MHz
and make use of 90 or 65 nmtechnology for AM chips
Muon/ECAL pT, h, f
P. Azzurri and D. Dobur
first AM application
proven to be easy to upgrade (1-2 years turn around time)
FTK: FastTracK @ ATLAS (University of Chicago, Laboratori Nazionali di Frascati, Harvard University, Univeristy of Illinois, University of Pisa and INFN Pisa, INFN Roma)
Full tracker reconstruction @ L2 @ full L1 out rate 100kHz
SLIM5: L1 tracking @ SuperB (F. Forti, M. Giorgi et al.)
R&D to develop MAPS sensor integrated with AM trigger
Ongoing R&D linked to CMS
Joint venture with CDF
CDF (Padova, Pisa, Siena) and CMS (Napoli, Perugia, Pisa, Roma)
Demonstrating AM-based Tracker Trigger also in conjunction with muon and electron triggering
Feasibility study of the switch using synergy with SLIM5 (INFN) developed boards
Submitted proposal to Ministry of Research for FY 2008-09On going AM projects
...Pattern matching in CDF (M. Dell’Orso, L. Ristori – 1985)
Current links in CMS Silicon Strip: 1300 @ 60 cm and 2600 @34 cm