CRYPTA@
- CRYogenic ProTon and Alpha target system -

CRYPTA (Cryogenic proton and alpha target system) is a compact liquid hydrogen, deuterium, and helium targets for radioisotope beam experiments at RIKEN. Hydrogen, deuterium, or helium gas is liquefied by a Gifford-McMahon cycle refrigerator instead of being supplied as a cryogenic liquid. The liquefied gas is accumulated in a target cell placed at the center of a g-ray detector array. The targets were operated stably in several experiments.