A series of PS-PPAC was developed and the position resolution was successively improved by us in order to meet the need of heavy ion physics research.The PS-PPAC may be divided into two groups.1 PS-PPAC used for stable(ion)bearna)Double grid position sensitive avalanche chamber(DGAC)~[1].DGAC consists of 4 electrodes:anode A,cathode C,grids K and G,which are made of wire planes.The sensitive area was 25×20 cm^2.A
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