Temperature profiles during quenches in LHC superconducting dipole magnetsprotected by quench heaters.

The efficiency of the magnet protection by quench heaters was studied using a never method which derives the temperature profile in a superconducting magnet during a quench from measured voltage signals. In several Large Hadr on Collider single aperture dipole models, temperature profiles and tempera ture gradients in the magnet coil have been evaluated in the case of protec tion by different sets of quench heaters and different powering and protect ion parameters. The influence of the insulation thickness between the quenc h heaters and the coil has also been considered. The results show clear cor relation between the positions of quench heaters, magnet protection paramet ers and temperature profiles. This study allowed a better understanding of the quench process mechanisms and the efficiency assessment of the differen t protection schemes.