COOLING STRUCTURE FOR OPEN-TYPE X-RAY SOURCE AND OPEN-TYPE X-RAY SOURCE

PROBLEM TO BE SOLVED: To provide a cooling structure for an open-type X-ray source capable of surely suppressing X-ray focus movement resulting from thermal expansion of a component due to heat generation of an aperture part by effectively removing heat generated in an aperture part, and an open-type X-ray source provided with such a cooling structure.SOLUTION: An aperture cooling structure (cooling structure for an open-type X-ray source) 10 comprises: an aperture part 31 on which an aperture 33 is formed; a holding part 34 which holds the aperture part 31; and a heat radiation part 36 connected to the holding part 34. The aperture 33 limits passing of an electron beam E on an electron passage 4 of an X-ray generator (open-type X-ray source). The heat radiation part 36 has a heat dissipation member 37 including a coolant passage configuration part 41 and a heat dissipation member 38 including a coolant passage configuration part 42. The coolant passage configuration part 41 and the coolant passage configuration part 42 are combined to constitute a coolant passage 43.