Development of a 2-dimensional multigrid-type MSGC using GLG method for the new generation spallation neutron sources

The neutron detector is one of the key components for the new generation spallation neutron source facilities. We have developed the multigrid-type MSGC(M-MSGC) with He-3 gas as a promising candidate for the new spectrometers. M-MSGC is improved on the ordinal MSGC with putting grids between anodes and cathodes for preventing discharge between electrodes and accumulation of charge on the surface. Moreover, we developed new read out method called as GLG method. Signals are encoded to two groups in this method. One group is named as global, which indicates the coarse position and the other group is local, which shows detail position in a global pattern. A period of the local pattern is corresponding to a global in length. We fabricated a GLG plate, which has 10 times 10 cm² of active area and 64 readout channels. Then the plate was tested at KEK photon factory as preliminary experiment for neutron detection. In the results, we could demonstrate the usability of the GLG readout method