Commissioning Validation of CLAS-12 Torus Magnet Protection and Cryogenic Safety System

This paper provides an overview of a test to confirm how the electromagnetic loss and energy balance in the CLAS12 Torus magnet system affect the cryogenics system in the event of a fast dump or quench. The test was a part of the commissioning activities within Hall B for the 12 GeV Accelerator Upgrade project at Jefferson Laboratory in November 2016. The test, as carried out, validated the design of the torus magnet protection and cryogenic safety systems. This magnet is unique in that it comprises six superconducting coils that are individually conduction-cooled by helium, thereby providing an element of thermal and mechanical decoupling between the coils. As such, its behavior under a fast dump condition (and even a quench) is markedly different from that of more conventional bath-cooled superconducting magnets.