| abstract |
A cryostat arrangement for the storage of liquid helium, with an outer jacket (2), a helium container (5) arranged therein, a neck tube (3) filled with gaseous helium in the operating state and a refrigerator (1; 1b), the outer jacket (2) , the helium container (5) and the neck tube (3) delimit an evacuated space (9) which encloses the helium container (5); and wherein the refrigerator (1; 1b) has a cooling finger (4) which has a condensation body (15; 15b) in the region of the lower end of the neck tube (3), characterized in that the condensation body (15; 15b) is partially from a condensation chamber (16; 16b) is surrounded, which has a first, lower opening (17), which allows an outflow of liquid helium, and which has a second opening, which opens into a lower end of a gas supply pipe (18), the upper end of the gas supply pipe (18) opens into the area of the upper end of the neck pipe (3). As a result, the thermal properties of the cryostat arrangement are improved, in particular control over convection currents in the interior of the neck tube (3) is achieved. |