Electron confinement in multi-anode saw tooth silicon drift detectors withan anode pitch of 250 mu m

Recently it has been experimentally shown that saw tooth shaped p(+) strips allows confinement of drifting electrons in the lateral direction. This is achieved by means of potential gutters induced by an appropriate saw tooth design of p(+) cathodes. The saw tooth period p(x) (= anode pitch) is the parameter mainly determining the maximal capacity of confined charge. Up-to -now the confinement effect was experimentally observed with a saw tooth de tector with p(x) = 500 mu m. The final detector is intended to have an anod e pitch of 250 mu m. The simulation of a saw tooth configuration with p(x) = 250 mu m, p(y) = 200 mu m, and alpha = 60 degrees showed that potential g utters with a depth of 80 mV will be produced assuming a drift field of 250 V/cm. We will give experimental evidence of these shallow charge confining potential gutters.