Injection upgrade on THE ISIS synchrotron
Jones B., Adams DJ., Jago SJS., Smith HV., Warsop CM.
The ISIS Facility at the Rutherford Appleton Laboratory in the UK produces intense neutron and muon beams for condensed matter research. The two neutron target stations are driven by a 70 MeV H- linac feeding into a 50 Hz, 800 MeV proton synchrotron which accelerates up to 3.75×1013 protons per pulse, delivering a mean beam power of 0.24 MW. Present upgrade studies are focussed on how a new, higher energy linac could increase beam power in the ISIS ring. Such an upgrade would replace one of the oldest sections of the ISIS machine, and with reduced space charge and optimised injection, may allow substantially increased intensity in the ring, perhaps towards the 0.5 MW regime . A critical aspect of such an upgrade would be the new higher energy injection straight. This paper summarises initial studies of 180 MeV H -charge-exchange injection into ISIS including: specification of a new stripping foil with simulations of stripping efficiency, beam scattering and foil heating effects; and magnetic and particle tracking models of the injection straight.