Beam Position System LHC The challenge of beam

Beam Position System @ LHC The challenge of beam Position System : Give an accurate closed orbit and trajectory with a resolution in the micron range, with a Beam Dynamic Range from 1 bunch of 1× 109 charges to 2808 bunches of 1. 7× 1011 charges and electrode pick-up that can operate at ~4 K. 950 cold BPMs 80 Warm BPMs 70 Special BPMs 100 for the transfer lines development examples FROM Tunnel To Acquisition electronics Observation & Measurement Concentration & transmission 4 Complete system layout Surface WORLDFIP MASTER slow control Surface point (1 to 8) Fibre Patch Panel WBTN FIP WBTN Power Front-end chassis INTENS WBTN WBTN FIP WBTN Power HALF OCTANT 3 Fibre Patch Panel INTENS 1 Acquisition chassis x 4 timing Fibre. Optic Link REAL-TIME DISPLAY IN CONTROL ROOM Ethernet link Corrections sent to the orbit correctors WORLDFIP MASTER 2 RT central processor FEEDBACK CONTROLLER DAB DAB DAB DAB DAB DAB Power. PC TTC RX Power. PC Digital Acquisition Board Fibreoptic link HALF OCTANT BPM Tunnel Vacuum pipe Total : 1200 BPMs for the LHC and its Transfer Lines BPM SSS containing 2 BPMs analogue front-end The cold BPM can operate at ~4 K BPM TO Control Room BPM SSS containing 2 BPMs … up to 35 quadrupoles LHC Tunnel Measurement of first full turn for Beam 2 September 9 th 2008 Numerous types of Beam position monitors: from ‘standard’ Button Feedthrough to Stripline Electrode 49 mm aperture Bunch by Bunch Oscillation Amplitude measurement example