Collimation system studies for the FCC-hh

Roderik Bruce ,James Molson ,Daniel Schulte ,Daniele Mirarchi ,Alessio Mereghetti ,Federico Carra ,A Faus‐Golfe ,Alexander Krainer ,M Serluca ,M Fiascaris ,A Abramov ,A Bertarelli ,Michele Pasquali ,E Skordis ,Anton Lechner ,F Cerutti ,Giorgia Gobbi ,Stefano Redaelli ,M I Besana ,M Varasteh

doi:10.1088/1742-6596/1350/1/012009

Abstract

The Future Circular Collider (FCC-hh) is being designed as a 100 km ring that should collide 50 TeV proton beams. At 8.3 GJ, its stored beam energy will be a factor 28 higher than what has been achieved in the Large Hadron Collider, which has the highest stored beam energy among the colliders built so far. This puts unprecedented demands on the control of beam losses and collimation, since even a tiny beam loss risks quenching superconducting magnets. We present in this article the design of the FCC-hh collimation system and study the beam cleaning through simulations of tracking, energy deposition, and thermo-mechanical response. We investigate the collimation performance for design beam loss scenarios and potential bottlenecks are highlighted.

Highlights

The FCC-hh is a design study for a future 100 km long 50 TeV proton collider [1]
It features an unprecedented total stored beam energy of 8.3 GJ, a factor 28 higher than what has been achieved at the Large Hadron Collider (LHC) [2]
We have shown a conceptual design of the FCC-hh collimation system, based on the LHC and high-luminosity LHC (HL-LHC) but with several modifications and additions

Summary

INTRODUCTION

The FCC-hh is a design study for a future 100 km long 50 TeV proton collider [1]. It features an unprecedented total stored beam energy of 8.3 GJ, a factor 28 higher than what has been achieved at the Large Hadron Collider (LHC) [2]. The β-functions and the length have been scaled up by a factor 5 to achieve collimator gaps that are similar to the LHC both in mm and in beam σ. This ensures mechanical stability and acceptable impedance at σ-settings small enough to protect the aperture. In the TCP, protons may suffer a significant energy loss in single-diffractive scattering, but only a small betatron kick Such protons risk to bypass downstream collimators in the straight section and be lost in the dispersion suppressor (DS) where the dispersion rises. Tertiary tungsten collimators (TCTs) at 10.5 σ are installed upstream of the experiments to protect the final-focus triplets

CLEANING PERFORMANCE

ENERGY DEPOSITION STUDIES

COLLIMATOR ROBUSTNESS STUDIES

CONCLUSIONS