The present invention provides an AC memory type plasma display panel comprising a pair of substrates and stacked together via a sealing member so as to have a discharge space therebetween, and discharge electrodes and a dielectric layer covering the discharge electrodes formed on at least one of the substrates. The channel plate adapter 24 is made of a plastic material, defines the orifice area of a fiber guide conduit and a center through-bore 26 for a yarn withdrawal nozzle 27, and is adapted to be exchangeably arranged in a receiver 22 of a fiber channel plate 10 for closing the rotor housing during a spinning operation. The air interface improves the internal reflection of the cascaded light guide.