Abstract
In view of the High-Luminosity upgrade of the Large Hadron Collider (LHC) collimation system, a family of novel molybdenum-carbide graphite (MoGr) composites was developed to meet the challenging requirements of HL-LHC beam-halo collimation, in particular the electrical conductivity and thermo-mechanical performances. The Ultra-High Vacuum (UHV) behaviour of this material was extensively characterized to assess its compatibility with the accelerator’s specifications. The results presented in this paper correlate the outgassing behaviour with the microscopic features of MoGr compared to other graphite-based materials. Residual gas analysis (RGA) was exploited to optimize post-production treatments.
Highlights
Published under licence by IOP Publishing LtdAfter the production, this material is treated under vacuum at 950°C for 72 hours
Introduction and vacuum requirements forLHC collimators In the High-Luminosity upgrade of the Large Hadron Collider (HL-LHC), the energy stored in the beam will increase by a factor of two with respect to the LHC: the absorber materials in the collimation system must maintain their structural robustness in case of accidental impacts, while minimizing the perturbation to the beam induced by RF impedance[1]
In view of the High-Luminosity upgrade of the Large Hadron Collider (LHC) collimation system, a family of novel molybdenum-carbide graphite (MoGr) composites was developed to meet the challenging requirements of HL-LHC beam-halo collimation, in particular the electrical conductivity and thermo-mechanical performances
Summary
After the production, this material is treated under vacuum at 950°C for 72 hours. This indicates that the mechanism of absorption is fast, and it occurs as soon as the material is exposed to a gas at atmospheric pressure, while its desorption is very slow: the presence of venting gases is still detectable at the end of the vacuum test, almost after 5 days in the test. Further studies to enhance Ne absorption by injecting it at higher temperature, during the cool down in the furnace, are ongoing
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