APV6/APV25 Beam Tests (May/December 2000)

In May and December 2000, several silicon detector modules with APV6 and APV25 readout were tested in a PSI [65] particle beam. At PSI, a proton beam of approximately $1.7\,\rm mA$ is accelerated in a cyclotron driven by a $0.8\,\rm MW$ oscillator at $50\,\rm MHz$. The protons are guided to two targets, from which several secondary beamlines are forked. The particle momentum within these secondary lines is selected by bending magnets.

The beamline used in our tests was set to provide protons and positive pions at a momentum of $350\,\rm MeV/c$. In most of the measurements, an aluminum plate was inserted upstream in the beamline which shields the protons but does not affect the pions. The focussing magnets were adjusted for a large beam spot of about $70\times 70\,\rm mm^2$ FWHM.