Target arrangement for spallation-neutron-sources

The target arrangement for spallation-neutron sources wherein a horizontal proton beam continuously impinges on the target, the arrangement comprising:

• a wheel having an annular volume of target material arranged thereon having an outer periphery upon which the beam impinges, a jacket overlying the target material in spaced relation thereto, and a window of low mass number metal joining the jacket and overlaying the outer periphery of the target material in spaced relation with respect thereto;
• shaft means for mounting the wheel to rotate in one direction about a vertical axis perpendicular to the horizontal proton beam with the target material positioned in intersection with the proton beam, and
• means for cooling the target material with a liquid coolant from a coolant source, the cooling means comprising:
• a plurality of grooves on the upper and lower surfaces of the target material, the grooves in one of the surfaces following involute curves which advance away from the direction of rotation of the wheel as the curves progress toward the periphery of the wheel and the grooves in the other surface following involute curves which advance toward the direction of rotation of the wheel as the curves progress toward the periphery of the wheel, the grooves communicating with the space between the window and periphery of the target material whereby liquid coolant flows from the grooves which advance away from the direction of rotation to the space between the window and outer periphery and then through the grooves which advance toward the direction of rotation while being confined by the jacket, the cooling means further including inlet and outlet means concentric with the shaft and connected to the grooves and the source of liquid coolant said grooves being of substantial equal lengths to provide for uniform heat removal from the entire target material.