A list of requirements was determined for the Main Beam Quad stabilisation to the nanometre level for the CDR and technical feasibility demonstration of CLIC. After comparison of different strategies, the strategy of a stiff stabilisation support was selected for increased robustness against external forces and compatibility with alignment. Test benches based on commercially available components were built in several steps to demonstrate numerically and experimentally the technical feasibility to stabilise better than the required level at 1Hz in two degrees of freedom, from levels characterised in a running accelerator in a deep tunnel (LHC). The possibility to reposition the MBQ with nanometre resolution between beam pulses was also demonstrated with the same test benches.
During the technical implementation phase, stabilisation supports based on the concepts used in the test benches will be designed and constructed for prototype MBQ magnets. The concept, mechanical support and control components will be further improved and optimised for the interaction with beam based feedback, alignment and operation in an accelerator environment. Especially the sensors should be improved. With more information becoming available from the test modules, technical noise characterisation and CLIC requirements, an optimisation will be made as a preparation for the industrialisation of the system.