A possible upgrade for ISIS

The Rutherford Appleton Laboratory's neutron spallation source ISIS is running at its design intensity of 200 /spl mu/A and demand for experimental time is 2.4 times that available. Studies have shown that it is possible to increase the accelerated current to nearly 300 /spl mu/A by installing four 2nd harmonic RF cavities in the synchrotron. This scheme, together with the other necessary changes to the ISIS Facility, are described. Compared with the capital value of the Facility, the expense of providing the extra 100 /spl mu/A is shown to be very modest.