Silicon drift detector; Studies about geometry of electrodes and production technology

Having high spatial resolution and good energy response the silicon drift detector (SDD) finds specific applications in experimental physics. The aims of this project are: simplified detector production and operation, improved total-to-sensitive-area ratio and stable working conditions. We have started a systematic study which includes all elements of the device, the silicon wafer, the various electrodes, an improved technology and VLSI front-end electronics. Several prototypes have been produced and we are progressively testing them. We summarize here our program of work and present the results from the first drift structures tested.