Speaker
Description
Summary
Currently groups of researchers are actively discussing possible scenarios of
upgrades of the LHC machine. According to the most financially realistic scenario the
LHC will be upgraded to provide proton beams of an order of magnitude larger
intensity (1035 cm-2 sec-1) colliding at twice the frequency (80 MHz) of the present
design but have the same centre of mass energy. This machine design is commonly
referred as the Super-LHC and it is expected to be operational after 2015. A
consequence of this design is that the backgrounds due to minimum bias events will
increase by at least a factor of 5. It is anticipated that CMS will require tracking
information in order for the trigger to be operated efficiently in this environment.
The performance of a single stack has been discussed in LECC 2005. In this paper we
review this approach, using a PYTHIA-based Monte Carlo as a reference. We then expand
the approach to cover the use of multiple stacks (in particular the double-stack
method), showing potential improvements in reconstructed resolution (both momentum
and position) as well as reconstruction purity. It has been found that the
reconstruction method can be implemented in the current generation of FPGAs, on a
comparable scale to the other trigger systems currently in CMS, and within the
current time budget of the Level-1 trigger.
