Preliminary Test of one-dimensional position encoding read-out for MICROMEGAS

The basic principles and implementation of one-dimensional position encoding read-out for MICROMEGAS have been introduced in this paper. A 10 cm × 10 cm prototype of one-dimensional position encoding read-out electrode based on printed circuit board was designed. Preliminary test indicates that the induction read-out is feasible and the ideal charge distribution is 1:2. X rays emitted from 55Fe source were collimated to one of strips on the read-out electrode through a slit of 200 μm, position decoding well reproduced the position of the 55Fe source. For its limitations,we have proposed a one-dimensional grouped position encoding read-out technique to address a neighboring strips simultaneously fired situation. The amount of read-out electronics is very easy to approach a reduction of 75% with position encoding read out technology. (authors)