Introduction

• Vitaliano Chiarella (INFN-LNF)

Room: Aula Bruno Touschek

High-Lumi LHC

• Helmut Burkhardt (CERN)

Room: Aula Bruno Touschek The talk will present the timeline and expectations for future LHC operation. The main changes planned on the machine side for the high-luminosity HL-LHC will be presented and the consequences for the experiments discussed with in particular : expected luminosity and pile-up, luminosity leveling, changes to the layout, and implications for radiation and backgrounds, luminosity measurements and protection in case of accidental beam loss.

Gaseous Detectors R&D for the Muon Systems Upgrade at LHC

• Giovanni Bencivenni (LNF)

Room: Aula Bruno Touschek Muon Systems at LHC experiments have performed extremely well with outstanding results during the Run1 phase. They are all based on gaseous detector technology: mainly wire/drift chamber and resistive parallel plate device. For the harsher background conditions foreseen at higher luminosity, after LS2 and in particular at HL-LHC, muon detectors, especially in the high eta regions of the experiments, are expected to be upgraded with novel detector technologies. A general overview of the Micro-Pattern Gas Detectors and the improved versions of wire chamber and RPC devices proposed for the Muon systems upgrades will be discussed.

Trigger for LHC Run II and beyond

• Guido Volpi (INFN Pisa)

Room: Aula Bruno Touschek The LHC will provide the experiment an enormous amount of data to test the Standard Model and its extensions to an unprecedented precision level. The increase in energy to 14 TeV and the instantaneous luminosity to 2x10^34 cm-2s-1 and beyond come at the price of an additional complexity of the events: LHC in 2015 is expected to deliver in average 40 collision per bunch, increasing to about 140 in Phase 2. The experiments need to update the DAQ and trigger system in order to maintain high efficiency in selecting interesting events, buried in extremely high background levels. The key point for efficient trigger selections is the suppression of the pileup contribution. A better use of the tracking information, able to identify the single collisions, as well as improvements in the detectors and their readouts is required. The use of modern computing solutions, as newer CPU or GPGPU, better networking systems and fast electronic processor, based on FPGA or Associative Memories, will allow to allow to win the challenge.

Next generation of silicon pixel detectors for the upgrade of the LHC experiments

• Markus Keil (CERN)

Room: Aula Bruno Touschek The particle sensors and the associated read-out electronics to be used for vertexing and tracking detection systems in high-energy particle physics experiments have very demanding requirements in terms of granularity, material thickness, read-out speed, power consumption and radiation hardness. The development of sensors based on silicon semiconductor technology and of read-out electronics based on CMOS technology (application specific integrated circuits, ASICs) in the 1980s revolutionised the implementation of such detection systems. This technology can be used to match the majority of the above requirements. Given this, silicon microstrip and pixel sensors are at the heart of the majority of particle tracking systems used in particle physics experiments today. The state-of-the-art silicon pixel detectors used in the innermost layers in the LHC experiments ATLAS, CMS, LHCb and ALICE all consist of Si pixel sensors bump-bonded to CMOS read-out electronics. The LHC experiments are preparing major upgrades of their experimental apparatus in order to deal with the planned upgrade of the LHC, which will increase the collision rate by an order of magnitude. This talk will give an overview of the main technological challenges that the upgrade of the silicon vertexing detectors have to face and the R&D activities that are being carried out. Special focus will be given to the upgrade of the ALICE Inner Tracking System that, for the first time at the LHC, will employ monolithic pixel detectors.

Calorimetry challanges in view of LHC upgrades

• Francesca Cavallari (INFN-ROMA1)

Room: Aula Bruno Touschek The Atlas and CMS calorimeters were designed to operate for a minimum of ten years at the LHC, with an instantaneous luminosity of 2x10^34/cm^2/s and for an integrated luminosity of 500/fb. The electromagnetic calorimeters were designed to have an excellent energy resolution for high energy photons, which led to the observation of the Higgs boson in its 2-photon decay mode. The hadronic calorimeters were optimised for the energy resolution of hadrons and for the missing energy measurement. Both calorimeter systems are described and the performance of the calorimeters at the LHC is presented. The high luminosity LHC (HL-LHC) is expected to provide an instantaneous luminosity of around 5 x 10^34/cm^2/s and integrate a total luminosity of around 3000/fb by about 2035 (ten years of data taking). The evolution of the Atlas and CMS calorimeters at HL-LHC is presented as well as the upgrades, which are foreseen for the detector components and the electronics, in order to allow the HL-LHC physics goals to be met.