# Conceptual Design of the Cryostat for a Highly Radiation Transparent 2 T Superconducting Detector Solenoid for FCC-ee+

Veronica Ilardi*, Alexey Dudarev, Helder Silva, Torsten Koettig, Lennard N. Busch, Patricia Borges De Sousa, Herman H.J.Ten Kate

*Corresponding author for this work

1 Citation (Scopus)

## Abstract

The Future Circular Collider electron-positron version (FCC-ee+) may be the next step towards a next generation of particle colliders. It may include an Experiment for probing ee+ collisions using the IDEA (International Detector for Electron-positron Accelerator), or a similar detector, requiring a solenoid enclosing the inner tracking detector. An innovative 2 T superconducting solenoid with 4 m bore and 6 m long has been accepted as baseline. Positioning the solenoid in between tracker and calorimeter requires an ultra-thin and highly radiation transparent cold mass. Likewise, a thin and radiation transparent cryostat is needed. The set value for the solenoid's maximum radiation length is 1 × X0. The cryostat is designed as a sandwich of thin Aluminum alloy inner and outer shells, eventually locally reinforced, for achieving vacuum tightness, and layers of innovative insulation material providing lowest thermal conductivity and sufficient mechanical resistance. Cryogel Z, a composite blanket of silica aerogel and reinforcing fibers, has a density of 160 kg/m3 and would allow a 250 mm cryostat thickness. As an alternative, glass spheres (e.g., K1 type, manufactured by 3M, with a $\text{65}\,\mu\text{m}$ diameter and a 125 kg/m3 density), or similar material, can be dispersed between the vacuum vessel thin-walls providing structural support. Besides the cryostat conceptual design, we outline the setup developed at CERN to represent the real-case cryostat and to measure the heat load transferred through the above-mentioned materials and we present the test results for Cryogel Z.

Original language English 8998405 IEEE transactions on applied superconductivity 30 4 https://doi.org/10.1109/TASC.2020.2973588 Published - 1 Jun 2020

## Keywords

• Aerogel
• Cryostat
• Insulation testing
• Solenoid
• Superconducting magnet
• n/a OA procedure

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