Ultra-slow muon facility for advanced μSR studies

A concept, a construction and an account of commissioning experiments up to May 1993 are given for the recently completed ultra-slow positive muon facility at the pulsed muon facility of UT-MSL/KEK. The intense and ultra-slowμ+ beam with an extremely small phase-space volume to be produced in this facility will open new muon sciences includingμSR studies on material surfaces.