During the hardware commissioning in 2008 more than 30 training quenches were performed in the main dipole circuits in sectors 45, 56, and 78. An overview of these quenches will be given, and the quench levels will be compared to the training observed in SM-18. Quench propagation to adjacent dipoles will be discussed, and an estimate will be given of the total number of training quenches...
Nuria Catalan Lasheras
During the incident of sector 3-4 on September 19th, the temperature of a number of magnets increased over the expected values prior to the circuit failure. A review of the data logged during powering tests on all circuits indicated potential resistive splices in sectors 1-2 and 6-7. Calorimetric and electrical measurements confirmed a high resistance in magnet B16.R1 and B32R6. Systematic...
In the days following the incident which occurred in Sector 3-4 of the LHC, a Task Force was constituted by experts from the relevant LHC systems, with the mandate to establish the sequence of facts, based on experimental observations and measurements, to analyse and explain the development of events, in relation with design assumptions, manufacturing and test data and risk analyses performed,...
Karl Hubert Mess
During the almost 18 months of hardware commissioning nearly all superconducting circuits of the LHC were tested with success and many of them are/were ready for operation. However a number of unexpected observations were made, which either may limit the performance of the accelerator, have an impact on the operation, require additional hardware and software, or were simply a challenging...
Mr Serge CLAUDET
Cool-down and refrigeration issues, cryogen management, Tuning LSS components, stability achieved, delays to recover failures, preliminary availability for beams, medium term consolidations envisaged.
Differently from its definition, the Hardware Commissioning has required a massive support of Software applications, which had in turn to be commissioned. Apart the control applications and the communication systems, special software tools had to be developed to rapidly and smoothly allow a safe circuit commissioning (sequencer, post-mortem, circuit commissioning status,...). The first part...