The Ieti cryostat is located in the HallC of the deep underground Laboratori Nazionali del Gran Sasso (L'Aquila, Italy). With a cooling power of about 0.2 mW at 100 mK, it can reach a base temperature as low as 6 mK.

Ieti was built starting from a commercialy available Cryomech pulse-tube refrigerator and from a Leiden Cryogenics dilution unit. Its main features are:

• pulse-tube cooling power of about 30 W at 55 K on the first stage, and 0.7 W at 4.2 K on the second stage
• dilution unit cooling power of about 500 μW at 120 mK with a ³He flow of 10⁻³ mol/s
• experimental space below the mixing chamber plate: 8000/5500 cc (without/with lead shield)

Ieti is equipped with a mu-metal magnetic shield at room temperature and a Cryoperm magnetic shield at base temperature. Furthermore, it offers lead shields that can be installed both around the fridge and inside it (at the 3 Kelvin and at base temperature). Its readout comprises:

8 radio-frequency lines (copper-beryllium coaxial cables from 300 to 3 Kelvin, NbTi superconducting coaxial cable from 3 K to 15 mK.

description NTD line;

3 channels DC-SQUID system for the read-out of low-impedence Transition Edge Sensors;

2 superconducting high-current DC lines (for coils operations)

..., 60co calibration, ...)

Among the active collaborations, we list the SQMS center and the COLD project funded by a PRIN of the Italian Research Minister, the CUPID experiment, and ....