Patent ID: 7872555

Claim:
An undulator comprising: a first magnetic circuit for forming a periodic magnetic field; a first support body for supporting the first magnetic circuit; a second magnetic circuit arranged so as to be opposite to the first magnetic circuit, for forming a periodic magnetic field; a second support body for supporting the second magnetic circuit; a space formed between the oppositely arranged first and second magnetic circuits, for passing an electron beam; a vacuum chamber for in-vacuuming the first magnetic circuit and the second magnetic circuit; a cooling mechanism for cooling a permanent magnet constituting the first magnetic circuit and the second magnetic circuit below the room temperature; a gap changing mechanism for changing a gap of the space; a refrigerant passing tube provided in the cooling mechanism, for passing a refrigerant; and a connecting component for connecting the refrigerant passing tube to each of the first support body and the second support body, wherein the connecting component has flexibility and allows the gap changing mechanism to change the gap.