P2-1180Active Magnetic Regenerative Refrigeratorwith Rotating Permanent Magnet.Key Words: Liquid Hydrogen, Magnetic Refrigeration, CryogenicsUtilizationofliquidhydrogenisessentialformasssupplyandlowcostofH2energy.However,theboil-offgasfromstoragetanksandtransportisacriticalissue.Thedevelopmentofhighlyefficienthydrogenliquefactionequipmentisdesired.The multiple AMR with rotating permanent magnets has been developed and operated successfully.The lowest temperature achieved with the developed apparatus was 20K.ConclusionMultiple AMR with Rotating MagnetsSubtitle (Arial, 58pt)To improve the cooling capacity, a new permanent magnet of which the magnetic field increases at the low temperature is under development.The experiment using rotating superconducting magnet made of MgB2wire is in progress. Future PlanIntroductionActiveMagneticRegenerativeRefrigeration(AMR),whichisoneofthemagneticrefrigerationmethods,hasbeenstudiedforhydrogenliquefactiontoimprovethecoolingefficiency.WehavedevelopedanAMRsystemforliquidhydrogentemperature(20K),usingrotatingpermanentmagnetsandnewlydevelopedmagneticmaterials,Theme underDiscussionMagnet Refrigeration System Group, GREEN Kyohei NATSUMEE-mail：： natsume.kyohei@nims.go.jp900 mmGM CryocoolerCryostatRotating Permanent Magnets (x4)AMR Units (x8) (Magnetic Material Containers)17.6 cc/unitTemperatureSensors(Cernox x 4)Actuator for RotationThermal ShieldHeat ExpelledHeat AbsorbedHeat Exchange gasHeat Exchange gasHeat ExpelledHeat AbsorbedHeat ExpelledSingle AMRDouble AMROctuple AMROctuple AMRMaterial: HoB2Magnetic Field: 1 TIntermittent rotation: 8 rpmGas pressure: 1.6 MPaGas mass flow rate: 2.1 g/sGas flow duration: 1.3 secTheoctupleAMRwithHoB2,anewmagneticmaterial,hasachievedthetemperaturethatiskepttobelessthan20K.Castro, P.B.d., Terashima, K., Yamamoto, T.D.et al.,NPG Asia Mater12, 35 (2020).HoAl2ParticlesΦ0.3-0.5 mm
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