Abstract

The Future Circular Collider (FCC) study includes the design of the detector magnets for the FCC-ee+ (electron-positron) collider, requiring a 2 T solenoid for particle spectrometry, and for the FCC-hh (proton-proton) collider, with a 4 T detector solenoid. For both solenoids and their cryostats, CERN is developing an innovative and challenging design in which the solenoids are positioned inside the calorimeters, directly surrounding the inner tracker. For this purpose, the cryostats must be optimized to have maximum radiation transparency. They are structured as a sandwich of thinnest possible metallic shells for achieving vacuum tightness, supported by layers of low density and highly radiation transparent insulation material, still providing sufficient mechanical resistance and low thermal conductivity. In this respect, thermal and mechanical analysis of innovative insulation materials are currently being carried out. The first material of interest, Cryogel® Z, is shaped as a flexible composite blanket, which combines silica aerogel with reinforcing fibers and a density of 160 kg/m3. It allows a 4 m bore, 6 m long FCC-ee+ detector solenoid cryostat with a total thickness of 250 mm. CERN has investigated the compression of Cryogel® Z under 1 bar equivalent mechanical load and its thermal conductivity between 10 K and room temperature, as well as the critical phenomena of thermal shrinkage and outgassing. We present the test results, as a first overview on the material.

Highlights

  • In the frame of the ongoing development of the generation of particle colliders, CERN is designing multiple variants of Detector Magnets for the projected Physics Experiments at the Future Circular Collider (FCC), which includes electron-positron, electron-hadron and hadron-hadron collision detectors [1]

  • The Future Circular Collider (FCC) study includes the design of the detector magnets for the FCC-ee+ collider, requiring a 2 T solenoid for particle spectrometry, and for the FCC-hh collider, with a 4 T detector solenoid

  • The cryostats must be optimized to have maximum radiation transparency. They are structured as a sandwich of thinnest possible metallic shells for achieving vacuum tightness, supported by layers of low density and highly radiation transparent insulation material, still providing sufficient mechanical resistance and low thermal conductivity

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Summary

Introduction

In the frame of the ongoing development of the generation of particle colliders, CERN is designing multiple variants of Detector Magnets for the projected Physics Experiments at the Future Circular Collider (FCC), which includes electron-positron (ee+), electron-hadron (eh) and hadron-hadron (hh) collision detectors [1]. CERN has investigated the compression of Cryogel® Z under 1 bar equivalent mechanical load and its thermal conductivity between 10 K and room temperature, as well as the critical phenomena of thermal shrinkage and outgassing. We present the results of the compression and thermal conductivity tests conducted on Cryogel® Z and the effects of possible thermal shrinkage and outgassing of the material.

Results
Conclusion
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