Spatial profile monitors for keV and MeV antiproton beams

A parallel plate ionization chamber and a secondary electron emission detector were developed to non-destructively measure the spatial profiles of antiproton beams with kinetic energies K = 5 – 21 MeV . The position-sensitive electrodes in these monitors were manufactured by using a laser trimmer to cut strip patterns on metalized polyester foils. Microwire secondary electron emission detectors were also developed to measure antiprotons at the lowest ( K = 10 – 100 keV ) energies. This detector was operated in ultrahigh vacuum ( p ∼ 10 - 8 Pa ) , low temperatures ( T < 100 K ) , and strong magnetic fields ( B > 0.1 T ) .