Abstract
The cryostats for the superconducting resonators of the ALPI Linac have been designed in order to meet the requirements of both using liquid helium at 4.5 K and gaseous helium at 7 bars and 60–80K for the thermal shield. Fourteen cryostats have already been manufactured and tested for the first phase of the installation: they will house 51 resonators, of the quarter-wave type, which use lead as superconductor. An interesting solution has been adopted for the construction of the shield and the liquid helium tank. They have been constructed in 316 LN stainless steel with a double wall technique capable of working at low temperature and high pressure.
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