  The WARP programme is a graded programme intended to search for cold Dark
Matter in the form of WIMP's. These particles may produce via weak interactions
nuclear recoils in the energy range 10-100 keV. A cryogenic noble liquid like
argon, already used in the realization of very large detector, permits the
simultaneous detection of both ionisation and scintillation induced by an
interaction, suggesting the possibility of discriminating between nuclear
recoils and electrons mediated events. A 2.3 litres two-phase argon detector
prototype has been used to perform several tests on the proposed technique.
Next step is the construction of a 100 litres sensitive volume device with
potential sensitivity a factor 100 better than presently existing experiments.
