Patent ID: 11955308
Assignee: KLA CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  H | IPC F  H

Claim 19:
20. A metrology system, comprising:
an electron beam source configured to generate an electron beam directed to an anode material located on a surface of a platen, wherein the interaction of the electron beam with the anode material causes the anode material to emit x-ray illumination light;
a rotary spindle shaft, a first end of the rotary spindle shaft configured to extend through an opening in a wall of a vacuum chamber, the platen coupled to the first end of the rotary spindle shaft and rotated about a rotational axis of the rotary spindle shaft;
a first radial air bearing disposed around the rotary spindle shaft adjacent to the first end, the first radial air bearing configured to support a load in a direction perpendicular to the rotational axis of the rotary spindle shaft;
a second radial air bearing disposed around the rotary spindle shaft adjacent to a second end of the rotary spindle shaft opposite the first end, the second radial air bearing configured to support a load in the direction perpendicular to the rotational axis of the rotary spindle shaft;
a rotary motor disposed between the first and second radial air bearings, the rotary motor configured to apply a rotational torque to the rotary spindle shaft, the rotary motor including a rotor coupled to the rotary spindle shaft;
a thrust bearing disposed between the first and second radial air bearings, the thrust bearing configured to support a load in a direction parallel to the rotational axis of the rotary spindle shaft;
one or more x-ray illumination optics configured to direct the x-ray illumination light to a specimen under measurement;
a detector configured to detect an amount of light from the specimen in response to the x-ray illumination light; and
a computing system configured to determine a value of at least one parameter of interest of the specimen under measurement based on the amount of detected light.