Measurement of superconducting busbars models for the LHC main dipole
IEEE Transactions on Applied Superconductivity(2000)
Abstract
The LHC main dipoles will be connected in series by superconducting busbars, consisting of a superconducting cable brazed onto a stabilizing copper profile. In case of a quench detection, protection heaters will be activated to drive the magnet to the resistive state. In addition, the magnet will be protected by a bypass diode. In order to limit quench propagation, the excitation current is ramped down at an initial rate of 113 A/s and with a time constant equal to 104 s. When a busbar quenches, its temperature must stay below safe values. Comparative measurements of a hollow and a solid busbar were performed in 1.9 K superfluid helium, 4.2 K liquid helium and 4.2 K gaseous helium during the current ramp down. We describe the experimental set-up and report the results. The development of temperatures, the quench propagation velocities as well as the residual resistance ratio (RRR) were measured. The busbar stabilized by a solid copper profile was found to be the most appropriate choice.
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Key words
accelerator magnets,busbars,superconducting cables,superconducting magnets,1.9 k,4.2 k,he,lhc dipole magnet,copper stabilizer,gaseous helium,liquid helium,quench propagation,residual resistance ratio,superconducting busbar,superconducting cable,superfluid helium
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