X-ray generation using electron beam

An X-ray generation apparatus, comprising:

• means for emitting an electron beam having a circular cross-sectional shape;
• means for focusing the electron beam while rotating the electron beam around a rotational axis;
• means for deforming the circular cross-sectional shape of the electron beam into an elliptical cross-sectional shape, wherein the elliptical cross-sectional shape has a major axis that is orthogonal to the rotational axis and a minor axis that is orthogonal to both the rotational axis and the major axis;
• means for transmitting the electron beam along the rotational axis, wherein a first inner diameter of the means for transmitting surrounded by the means for focusing is larger than a second inner diameter of the means for transmitting surrounded by the means for deforming, and wherein an end portion of the means for transmitting directed toward a target of the electron beam includes a third inner diameter that is smaller than the second inner diameter;
• and
• means for emitting an X-ray in response to receiving, at the target, the electron beam having the elliptical cross-sectional shape.

A method of generating an X-ray, comprising:

• emitting an electron beam having a circular cross-sectional shape;
• focusing, by a first magnetic lens, the electron beam having the circular cross-sectional shape while rotating the electron beam around a rotational axis;
• deforming, by a second magnetic lens, the circular cross-sectional shape of the electron beam into an elliptical cross-sectional shape, wherein the elliptical cross-sectional shape has a major axis that is orthogonal to the rotational axis and a minor axis that is orthogonal to both the rotational axis and the major axis;
• transmitting the electron beam through a tubular portion extending along the rotational axis, wherein a first inner diameter of the tubular portion surrounded by the first magnetic lens is larger than a second inner diameter of the tubular portion surrounded by the second magnetic lens, and wherein an end of the tubular portion directed toward a target of the electron beam includes a third inner diameter that is smaller than the second inner diameter;
• and
• emitting an X-ray in response to receiving, at the target, the electron beam having the elliptical cross-sectional shape.