The ISIS synchrotron at the Rutherford Appleton Laboratory in the UK is currently undergoing an RF upgrade. Four h=4, or second harmonic (2RF), cavities have been installed in addition to the existing six h=2, fundamental frequency (1RF), cavities and should be capable of increasing the operating current from 200 to 300μA. Two of the four cavities have been in operation for the last 2 user cycles of 2007 improving trapping losses and increasing operating currents beyond 200μA. The remaining two cavities were commissioned in the spring of 2008. This paper reports on hardware commissioning, beam tests and beam simulation results.
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