An x-ray housing comprising: a finned housing member having a tubular body with an external fin array on a finned external surface and an internal fin array on a finned internal surface, the finned internal surface defining a finned housing lumen , the internal fin array and external fin array cooperatively forming a heat exchanger; the internal fin array covering the finned internal surface between a first end and an un-finned stator recess and an un-finned annular region at a second end with a plurality of internal fins separated by a plurality of internal finned recesses , and the x-ray housing further comprises an apertured housing member having a tubular body with an x-ray window aperture extending therethrough from an external surface to an internal surface, the internal surface defining an apertured housing lumen ; the finned housing member having an annular end integrally coupled - i.e. it can be welded, brazed, adhered, screwed together, or otherwise mechanically joined-with an annular end of the apertured housing member to form a tubular x-ray housing having an x-ray housing lumen formed from the finned housing lumen and apertured housing lumen ; and an x-ray housing window attached in a fluid-tight arrangement to the x-ray housing , the x-ray housing window aligned with the x-ray window aperture of the apertured housing ; wherein the external fin array covers the finned external surface between the first end and the un-finned annular region at the second end with a plurality of external fins separated by a plurality of external fin recesses ;and characterised in that the stator recess extends from the un-finned annular region at the second end of the finned housing to a stator bracket mounted to the finned internal surface between the first end and the second end of the finned housing , wherein the stator recess has a trough into the finned housing that has a depth that is the same or deeper than the internal finned recesses of the internal fin array . a finned housing member having a tubular body with an external fin array on a finned external surface and an internal fin array on a finned internal surface, the finned internal surface defining a finned housing lumen , the internal fin array and external fin array cooperatively forming a heat exchanger; the internal fin array covering the finned internal surface between a first end and an un-finned stator recess and an un-finned annular region at a second end with a plurality of internal fins separated by a plurality of internal finned recesses , and the x-ray housing further comprises an apertured housing member having a tubular body with an x-ray window aperture extending therethrough from an external surface to an internal surface, the internal surface defining an apertured housing lumen ; the finned housing member having an annular end integrally coupled - i.e. it can be welded, brazed, adhered, screwed together, or otherwise mechanically joined-with an annular end of the apertured housing member to form a tubular x-ray housing having an x-ray housing lumen formed from the finned housing lumen and apertured housing lumen ; and an x-ray housing window attached in a fluid-tight arrangement to the x-ray housing , the x-ray housing window aligned with the x-ray window aperture of the apertured housing ; wherein the external fin array covers the finned external surface between the first end and the un-finned annular region at the second end with a plurality of external fins separated by a plurality of external fin recesses ;and <EOS>