Improved results from the gas scattering energy spectrometer on the isis RFQ test stand

The novel Gas Scattering Energy Spectrometer on the ISIS RFQ Test Stand at the Rutherford Appleton Laboratory (Oxfordshire, UK) has been used to measure the energy spectrum of the -665 keV H beam from a four-rod RFQ as a function of RF drive power. Since EPAC'02 changes have been made to the experimental arrangement, which markedly improve the quality of the results that can be obtained. These new results are reported.