The Upgrade of the CMS Tracker at HL-LHC

Abstract

In the high luminosity scenario of the LHC (HL-LHC), which will bring the instantaneous luminosity up to 7.5 × 10 34 cm −2 s −1 , ATLAS and CMS will need to operate at up to 200 interactions per 25 ns beam crossing and reaching up to 4000 fb −1 of integrated luminosity. To achieve their physics goals the experiments will need to improve the tracking and vertexing capability and the ability to selectively trigger on specific physics events at reasonable thresholds. The upgrade of the CMS Tracker requires designing new inner and outer tracking detectors to cope with the increased luminosity and to implement first trigger level functionality. This paper describes the new layout and the technological choices together with some highlights of research and development activities.

Observing Axion Emission from Supernova with Collider Detectors

“…From the beam pipe to the outside of the tracker region, the total material budget of the ATLAS detector is ∼ 0.3 − 2 radiation length for |η| = 0 − 4 (with η being the pseudorapidity) in the high luminosity scenario of the LHC (HL-LHC) [70]. For the case of the CMS, it is ∼ 0.3 − 1.6 radiation length for |η| = 0 − 1.5 and ∼ 1.6 − 0.8 radiation length for |η| = 1.5 − 3 [71]. Thus, the photon may not be regarded as a free particle in the central region and the conversion rate of the SN axion to the photon is suppressed.…”

Comparison of readout systems for high-rate silicon photomultiplier applications

“…The High-Luminosity LHC project aims to increase its instantaneous luminosity by a factor of five beyond the original design value to 5 × 10 −34 cm −2 s −1 and the annual integrated luminosity to 250 fb −1 which is a factor of ten from the original design value [1]. Consequently, the detectors in LHC are also upgrading the readout electronics to match the increase in luminosity [2][3][4]. The intensity frontier experiments, e.g.…”