77 research outputs found
A Survey of Pressure Vessel Code Compliance for Superconducting RF Cryomodules
Superconducting radio frequency (SRF) cavities made from niobium and cooled
with liquid helium are becoming key components of many particle accelerators.
The helium vessels surrounding the RF cavities, portions of the niobium
cavities themselves, and also possibly the vacuum vessels containing these
assemblies, generally fall under the scope of local and national pressure
vessel codes. In the U.S., Department of Energy rules require national
laboratories to follow national consensus pressure vessel standards or to show
"a level of safety greater than or equal to" that of the applicable standard.
Thus, while used for its superconducting properties, niobium ends up being
treated as a low-temperature pressure vessel material. Niobium material is not
a code listed material and therefore requires the designer to understand the
mechanical properties for material used in each pressure vessel fabrication;
compliance with pressure vessel codes therefore becomes a problem. This report
summarizes the approaches that various institutions have taken in order to
bring superconducting RF cryomodules into compliance with pressure vessel
codes.Comment: 7 p
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