Preliminary collimation system design concept and performance estimate: Deliverable D2.6

Description of the collimation system baseline design including a list of beam-line elements (type, description, quantity, physical element characteristics). Description of the assumptions, requirements and constraints on the infrastructure and services. Summary of the expected performance

Simulation of the FCC-hh collimation system

International audienceThe proposed CERN FCC-hh proton-proton collider will operate at unprecedented per-particle (50 TeV) and total stored beam energies (8.4 GJ). These high energies create the requirement for an efficient collimation system in order to protect the accelerator components and experiments. In order to verify the performance of proposed collimation system designs, loss map simulations have been performed using the code Merlin. Results for the current baseline layout are presented for both betatron and off-momentum loss maps

Collimation Strategies for Secondary Beams in FCC-hh Ion-Ion Operation

The target peak luminosity of the CERN FCC-hh during Pb-Pb collisions is more than a factor of 50 greater than that achieved by the LHC in 2018. As a result, the intensity of secondary beams produced in collisions at the interaction points will be significantly higher than previously experienced. With up to 72 kW deposited in a localised region by a single secondary beam type, namely the one originated by Bound Free Pair Production (BFPP), it is essential to develop strategies to safely intercept these beams, including the ones from ElectroMagnetic Dissociation (EMD), in order to ensure successful FCC-hh Pb-Pb operation. A series of beam tracking and energy deposition simulations were performed to determine the optimal solution for handling the impact of such beams. In this contribution the most advanced results are presented, with a discussion of different options

THE MERLIN SIMULATION PROGRAM: NEW FEATURES USED IN STUDIES OF THE LHC COLLIMATION SYSTEM USING MERLIN

Abstract We present recent developments in the MERLIN particle tracking simulation code, originally developed at DESY. We have implemented differential scattering cross-sections based on a pomeron exchange model interpolated over experimental measurement data, and show that this model is important at the small scattering angles generated in the LHC collimators. Preliminary comparisons with previous simulations are presented

Status of the FCC-hh Collimation System

International audienceThe future circular hadron collider (FCC-hh) will have an unprecedented proton beam energy of 50 TeV, and total stored beam energy of 8.4 GJ. We discuss current developments in the collimation system design, and methods with which the challenges faced due to the high energies involved can be mitigated. Finally simulation results of new collimation system designs are presented

LHC MD 2186: New Method to Measure Margins between IP6 Absorbers and TCTs/Triplets

During the LHC Machine Development (MD) 2186, performed on October 28th 2018, a new method to measure the Beam 2 aperture margins between the absorbers located in IR6 and the tertiary collimators (TCTs) in IR5 was tested. This note presents the main results achieved

Status of MERLIN

MERLIN is an accelerator physics library written in C++ which can be used for a range of accelerator tracking simulations, including collimation in hadron colliders. Recently MERLIN has been upgraded to provide a robust tool for HL-LHC collimation, including the treatment of composite materials, and a hollow electron lens process. We describe the features of MERLIN used in collimation simulations