The requirements for beam loss control on the 1.334GeV accumulator rings of the European Spallation Source are summarised. The main features of the beam loss collector system design are described, along with the underlying aims. Use of a specially developed code to test the proposed system under most foreseeable loss conditions, with machine errors, is described. Predicted collection efficiencies, in terms of localisation and surviving halo, are given. Simulations indicate that the required uncontrolled loss levels of <1 W/m over most of the machine will be achievable. * Work here based on parts of the author's Ph.D. thesis [2]

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The ISIS 800 MeV proton synchrotron presently provides 2.5x10 13 protons per pulse at 50 Hz, corresponding to a mean power of 160 kW. A dual harmonic RF system upgrade, now being installed, is expected to increase the intensity and power to about 3.75x10 13 ppp and 240 kW respectively. This paper describes work presently underway to understand and optimise beam loss control, which is a dominant factor determining operational performance. The main features of the collimation system are described, and Monte Carlo simulations of the loss control process are used to understand variations of efficiency with beam loss mode (growth rate, plane). Results of simulations are compared with measurements and operational data. Improvements to measurements are also outlined.

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