Andreas Jansson developed a magnetic quadruple pickup for deployment in the CERN PS. Driven by the need for a non-destructive measurement of injection matching to preserve the small emittance of the LHC beam, Jansson's device employs magnetic coupling in a special pick-up geometry to remove the otherwise dominating background signal, thereby reducing the common-mode rejection requirements by about 60dB. Two pick-ups have been installed in the CERN PS.
Read more about Andreas Jansson's device.