ZEPLIN II and Amplification of Primary Scintillation

We will discuss the detailed design of the 30 kg two-phase xenon ZEPLIN II detector, to be installed in the Boulby mine, UK in early 2001, for the direct detection of WIMP dark matter. Xenon provides many advantages for WIMP searching. Also we will describe a possible primary amplification method with Csl internal photo cathode. We achieved more than 10 times amplification ratio for a initial photon. This method will maximize the efficiency of ZEPLIN II to search for Super-Symmetric Dark Matter.