Instrumentation of the upgraded ATLAS tracker with a double buffer front-end architecture for track triggering

The Large Hadron Collider will be upgraded to provide instantaneous luminosity $L=5\times10^{34}\,\mbox{cm}^{-2}\mbox{s}^{-1}$, leading to excessive rates from the ATLAS Level-1 trigger. A double buffer front-end architecture for the ATLAS tracker replacement is proposed, that will enable the use of track information in trigger decisions within 20$\,\mu$s in order to reduce the high trigger rates. Analysis of ATLAS simulations have found that using track information will enable the use of single lepton triggers with transverse momentum thresholds of $p_{T}\sim25\,$GeV, which will be of great benefit to the future physics programme of ATLAS