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=5–21MeV. 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=10–100keV) energies. This detector was operated in ultrahigh vacuum (p∼10-8Pa), low temperatures (T<100K), and strong magnetic fields (B>0.1T).