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This note summarizes the results of the "Workshop on Polarisation and BeamEnergy Measurements at the ILC", held at DESY (Zeuthen) April 9-11 2008. Thetopics for the workshop included (i) physics requirements, (ii) polarisedsources and low energy polarimetry, (iii) BDS polarimeters, (iv) BDS energyspectrometers, and (v) physics-based measurements of beam polarisation and beamenergy from collider data. Discussions focused on the current ILC baselineprogramme as described in the Reference Design Report (RDR), which includesphysics runs at beam energies between 100 and 250 GeV, as well as calibrationruns on the Z-pole. Electron polarisation of P_e- >~ 80% and positronpolarisation of P_e+ >~ 30% are part of the baseline configuration of themachine. Energy and polarisation measurements for ILC options beyond thebaseline, including Z-pole running and the 1 TeV energy upgrade, were alsodiscussed.

Executive Summary of the Workshop on Polarisation and Beam Energy Measurements at the ILC