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The CERN SPS has been delivering proton beams at 400 GeV for physics since January 1977 and currently runs with a circulating beam intensity of 2??1013 protons per pulse and repetition time of 9.6 seconds. This paper discusses the steps taken to reach this intensity, the limitations at various stages in the development, and the equipment under construction to attain 3??1013 ppp. It also reviews the...
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