Industrial magnetron

An industrial magnetron that includes an anode cylinder body and a cooling block arranged in a columnar manner around an outer periphery of the anode cylinder body, wherein

• the cooling block is provided with,
• a refrigerant flow path that circulates a liquid refrigerant to circulate around the anode cylinder body and directly cool the anode cylinder body,
• the refrigerant flow path has,
• a helical groove on an inner wall surface, and
• in a sample product manufacturing stage prior to actual production, a test operation is performed to specify a heat generation position of the anode cylinder body and measure a heat generation amount, and then pitch, inner diameter, and nominal diameter of the helical groove, an arrangement position of the refrigerant flow path, and the number of turns of the refrigerant flow path are set according to the heat generation position and the heat generation amount.