Measuring beam emittance for high-energy H/sup -/ accelerators

A novel technique is presented for measuring the six-dimensional beam emittance for high-energy H/sup -/ accelerators in real time. This technique uses the single charge exchange cross section from thin and narrow foils (intercepting 1-3% of the beam) as a line source for measuring the divergence and momentum spectra for operating H/sup -/ accelerator beams. By scanning the foil across the beam, X, /THETA/, and p beam density spectra and emittance can be determined. The introduction of a second foil provides the Y-/phi/ emittance. 2 refs