• R. Denz, K. Dahlerup-Petersen, F. Formenti, K.H. Meß, A.P. Siemko, J. Steckert, L. Walckiers
  CERN, Geneva
• J. Strait
  Fermilab, Batavia

Prior to the re-start of the Large Hadron Collider LHC in 2009 the protection system for superconducting magnets and bus bars QPS will be submitted to a substantial upgrade. The foreseen modifications will enhance the capability of the system in detecting problems related to the electrical interconnections between superconducting magnets as well as the detection of so-called symmetric quenches in the LHC main magnets. The paper will describe the design and implementation of the new protection layers and report as well on the commissioning of the system and first operational results.