NMR magnet with superconducting coil in supercooled helium bath - is kept at atmospheric presure and with temp. of supercooled helium in first cyrostat chamber less than 4.2 k with cryostat having at least one further chamber

摘要

The first chamber (1) of the cryostat (4) is connected with a secondary chamber so that the supercooled liquid helium contained in the first chamber (1) is likewise at atmospheric pressure. The secondary chamber (2) of the cryostat (4) contains liquid helium with a temp. of about 4.2 K and essentially at atmospheric pressure. The electric supply lines for the charging of the superconducting magnetic coil (3), before the entry in to the first chamber of the cryostat, are first led through the further chamber of the cryostat. A refrigerator (6) is provided in the first chamber, so that the liquid helium can be cooled to a temp. (T) of 4.2 K esp. less than 2.3 K. USE/ADVANTAGES - NMR magnetic system with superconducting coil. Electrical entry to magnetic coil is considerably simplified, and no vacuum lead in is necessary.