A divertor 1 includes a casing 11, a jet body 12 which is installed inside the casing 11, an intake port 13 which is installed at an upper portion of the casing 11, an exhaust port 14 which is installed at a lower portion of the casing 11, a working fluid reservoir 15 which is installed at a bottom portion of the casing 11 and stores a working fluid, a jet nozzle 16 which ejects vapor of the working fluid, which is heated by a heater and thereby evaporated, in a downward direction, and a temperature adjustment pipe 17 which is installed to surround the casing 11. The working fluid is an alkali metal or a low-boiling-point metal.