Patent ID: 8459045

Claim:
A helium 3 refrigerator-utilizing a magnetic property measurement system comprising: a helium 3 refrigerator provided with a sample rod having a sample fixed thereon and a main pipe having the sample rod inserted therein and forming in a circumference of the sample rod a space for effecting cooling with helium 3; and a magnetic property measurement system provided with a tubular body for permitting insertion of the helium 3 refrigerator therein and a cooling means disposed on an outer periphery of the tubular body and operated with helium 4 and further provided with a superconducting magnet, a magnetic field forming means, a temperature adjusting means and a magnetic field adjusting means, wherein the main pipe is formed, sequentially from top to bottom, of an upper supporting tube, a condensing tube, a lower inner tube and an outer tube adapted to form an insulated vacuum chamber between the outer tube and the lower inner tube that seals the vacuum chamber through forming of the outer tube, the upper supporting tube and the lower inner tube are connected to each other through the condensing tube, a connecting tube is fixed at a lower end of the condensing tube, and the outer tube and the lower inner tube are connected to each other via the connecting tube with a certain gap forming the insulated vacuum chamber, a part of the connecting tube is mounted on an inside of the condensing tube, the outer tube is located outside of the connecting tube, and the lower inner tube is located inside of the connecting tube, and wherein the lower inner tube is formed of titanium that decreases a background signal.