Summary talk: opening session

This paper provides a summary of Session 1 of the workshop. The session laid the basis for the subsequent detailed presentations and discussions on options for increasing the luminosity of the LHC. In particular, the session summarised the physics motivation, introduced critical items regarding the machine-detector interface, outlined options for upgrading the LHC insertion regions, and sketched the challenges for the fast-pulsed high energy injectors

LHC Interaction Region Upgrades and the Machine–Experiment Interface

Schemes for increasing the luminosity delivered to the ATLAS and CMS experiments at the LHC, based on the implementation of modified or additional inner triplet quadrupoles and/or dipoles close to the interaction points, are being developed and result in the need to upgrade the interaction regions around Point 1 and Point 5. This paper presents some of the challenges for the experiments and for the LHC Collider resulting from such schemes and provides some suggestions for further studies

The study of the machine-induced background and its applications at the LHC

We present the recent advances in the analysis of the machine-induced background generation and formation at the LHC. Different aspects of the study of the machine background problem at the LHC are reviewed, including the background production at the different stages of the machine operation, the role and influence on the background from the collimators in the experimental insertions and the background shielding. The potential use of the machine background for the purposes of detector testing and alignment is also discussed

Tertiary halo and tertiary background in the low luminosity experimental insertion IR8 of the LHC

In our report we present the results for numerical simulation of tertiary halo and tertiary background in the LHC. We study the case of the proton losses in the betatron cleaning insertion IR7 with the subsequent tertiary halo generation in the downstream experimental insertion IR8. We analyze the formation of tertiary background in the experimental area of the IR8 and evaluate the performance of the machine-detector interface shielding with respect to this source of the background. The results obtained are compared with the previous estimates of the machine-induced background in the low luminosity insertions of the LHC, and the balance between different sources of the background is discussed