Facilities and Equipment

The ADR is widely used to various low temperature experiments because the cooling process is relatively simple and can make 30 ~100 mK with quickly compare than the dilution refrigerator. In addition, the ADR is very useful equipment for the study which need to measure the physical properties depends on the temperature changes, because it is easy to control the temperature to 30 mK to 100 mK. The MMC (Metallic Magnetic Calorimeter) is the essential device to compose the LT detector, and the performance of MMC sensor is solely determined by the temperature-magnetization characteristics depending on the concentration of the paramagnetic material. Therefore, we measured the temperature- magnetization characteristics of all fabricated MMC devices to select the available MMC sensors to use the AMoRE experiment.

Meanwhile, the CUP have studied the way to improve the performance of the light sensor which has smaller signal amplitude than the phonon (heat) sensor. We tried to test the light absorbing property of the various materials, i.e., silicon, sapphire, silicon-sapphire, and germanium wafer with the ADR refrigerator. In addition, we developed the new photon (light) detector combined the MMC and SQUID with the light amplifier using the Neganov-Luke effect and are testing the efficiency of the new detector. We also developed the LT detector using small size of CaMoO4, NaMoO4, Li2MoO4, ZnWO4 crystals for the AMoRE-2 experiment and studied the characteristics.

• 1’st stage Cryogen free cooler
  • Pulse tube refrigerator (Cryomech PT415 with remote motor)
  • 25 W @ 55 K, 0.7 W @ 4.2 K
• Kevlar suspension to reduce vibration
• experimental space : 26 cm (diameter) X 25 cm (height)
• Cooling Capacity
  • Operation temperature : 30 mK ~ 2.7 K
  • Holding time at 50 mK : 24 hours
  • GGG : 1.2 J @ 1K
  • FAA : 120 mJ @ 100 mK
  • minimum temperature : 30 mK
  • Cool-down time : 15 hour from 300 K to 4 K
  • >150 hour no-load regulation @ 100 mK