Objectif The research program aims to develop a high-efficiency technique for steering of halo particles in a large hadron collider-using bent channelling crystal. The technique can be used to strongly enhance the efficiency of beam cleaning system if a bent crystal serves as a primary element in the LHC beam collimation system, reducing the beam-related backgrounds in the collider experiments by an order of magnitude as estimated. Whenever required, the same technique can be used for slow parasitic extraction from the LHC halo without interfering with collider work, with extraction efficiency between 50-90% according to simulations.The main objectives of the project are:1 To study a high-efficiency multipass mode of extraction from accelerator using bent crystals in experiments at 70 GeV;2 To develop a theory of beam multipass extraction by short crystals in a broad range of energies, and to support by Monte Carlo simulations the experimental studies of extraction;3 To create a crystal-based collimation system for efficient scraping of 70-GeV proton accelerator beam halo in order to research crystal collimation as a technique for the LHC by means of experimental tests at 70GeV and realistic simulations;4 To perform detailed simulations of crystal-assisted extraction of protons and heavy ions from the LHC beam halo, optimise the efficiency, and evaluate requirements and limitations for the method;5 To study in realistic simulations the crystal work as a primary element of a scraping system for the LHC beam halo cleaning, optimise the crystal parameters, understand requirements and limitations for the method, and evaluate the scraping efficiency;6 To create and test principally new crystalline devices for beam steering using graded composition SiGe/Si layers at beam energies up to 70GeV, and to perform detailed Monte Carlo simulations to properly assess the bending efficiency of graded composition layers;7 To achieve electron-microscopy and x-ray characterisations of bent crystals in order to study defects and interfaces (for SiGe/Si layers). Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Thème(s) 1A - Nuclear Physics, Astronomy, Astrophysics CERN - CERN Appel à propositions Data not available Régime de financement Data not available Coordinateur CERN Contribution de l’UE Aucune donnée Adresse LHC division M07710 1211 Geneva 23 Suisse Voir sur la carte Coût total Aucune donnée Participants (4) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire IHEP Russie Contribution de l’UE Aucune donnée Adresse Pobedy ulitsa 1 142284 Protvino, Moscow region Voir sur la carte Coût total Aucune donnée Russian Academy of Sciencies Russie Contribution de l’UE Aucune donnée Adresse Orlova Roscha 188350 Gatchina, St. Petersburg region Voir sur la carte Coût total Aucune donnée Universita di Ferrara Italie Contribution de l’UE Aucune donnée Adresse via Paradiso 12 44100 Ferrara Voir sur la carte Coût total Aucune donnée University of Surrey Royaume-Uni Contribution de l’UE Aucune donnée Adresse av. prof gama pinto 2 GU2 5XH Guilford Voir sur la carte Coût total Aucune donnée
