Quench performance and mechanical behavior of 1 m model magnet for the LHClow-beta quadrupoles at KEK

High gradient 70 mm aperture superconducting low-beta quadrupole magnets ha ve been developed at KEK as part of the collaboration between CERN and KEK for the Large Hadron Collider (LHC). After development of two I m model mag nets, the third model magnet with the new coil design was built and excitat ion tests were completed. The third model successfully reached the design f ield gradient of 240 T/m and showed training memory after full thermal cycl es. Other quench tests were performed and it was verified that the third mo del exhibited reliable quench performance and sufficient safety margin duri ng operation.