Cooling block and industrial magnetron

A cooling block formed in a columnar shape in an outer periphery of an anode cylindrical body of a high power industrial magnetron, wherein

• the cooling block comprises at different positions in a vertical direction, two or more flow paths through which refrigerant flows, and
• the flow paths closest to each other in the vertical direction indicating a direction of a central axis of an anode cylindrical body insertion portion of the industrial magnetron are connected to each other by at least one or more connection flow paths in the cooling block,
• when, among the two or more flow paths, a flow path located uppermost in the vertical direction is referred to as an upper stage flow path, and a flow path located lowermost in the vertical direction is referred to as a lower stage flow path,
• a connection port is provided at one end of each of the upper stage flow path and the lower stage flow path, and
• the cooling block has
• a configuration in which the refrigerant is introduced from the connection port of the lower stage flow path and is discharged from the connection port of the upper stage flow path, or
• a configuration in which the refrigerant is introduced from the connection port of the upper stage flow path and is discharged from the connection port of the lower stage flow path,
• the upper stage flow path and the lower stage flow path are connected to the at least one or more connection flow paths in the vicinity of the connection ports.