New product

• Optical combi cryostat in the 0.45 - 1.6 K temperature range

Sample in liquid He₃

CRYO105_Íå3 is a helium cryostat with He3-insert for optical investigations in the temperature region 0.45 – 1.6 K. The cryostat design is similar to that of the liquid helium optical cryostat optCRYO105. The cylindrical sample room of the CRYO105_Íå3 cryostat is used as a He3-insert, whereas the quartz window allows the optical investigations of the samples, placed on the sample holder within the sample room. Inside the cryostat body are located the liquid nitrogen and helium reservoirs. The internal parts of the cryostat are isolated from the body by high vacuum protection. The nitrogen bath cools the copper radiation screen that prevents the helium-4 boiling within the helium reservoir. In addition, the second co-axial radiation screen cooled by liquid helium-4 reservoir protects the He3-insert.

The sample on the sample holder, introduced vertically in the He3-insert, is surrounded by the gaseous helium-3 that is mainly collected in the external He3-receiver. Under out pumping of the helium-4 its temperature drops down to 1.5 K and the helium-3 condense on the copper plates of the He3-insert that are in the thermal contact with the helium-4 reservoir walls. As a result, the liquid helium-3 fills the sample room to a level considerably higher than the quartz window. Under further out pumping of the liquid helium-3 by the high-output coal pump the temperature drops down to 0.45 K for a period more than 15 hours. The sample change is available at room temperature only, when the helium-3 gas fills only the He3-receiver.