Abstract:
Disclosed herein is a point-diffraction interferometer which can inspect a surface quality of an optical system for extreme ultraviolet lithography using a high-order harmonic X-ray source with excellent coherence, and an apparatus and method for generating a high-order harmonic X-ray. The present invention uses a high-order harmonic X-ray beam as a coherence light source, thus remarkably reducing the size of an apparatus for generating a light source to approximately {fraction (1/100)} of a device using a light source generated in a conventional synchrotron. Further, the present invention simplifies the construction of an interferometer by employing a thin foil in which a pinhole is formed through a drilling technique using high power femtosecond laser, thus increasing the industrial utility of the interferometer.
Abstract:
The invention relates to a window transparent to electron rays comprising a foil (1, 10, 300a) transparent to electron rays and separated from a carrier substrate as well as a retaining element (2, 300b) for supporting a peripheral region of the foil transparent to electron rays in the operational state, which retaining element (2, 300b) is made of a material which has a linear thermal expansion coefficient which matches the linear thermal expansion coefficient of the foil material. The invention further relates to a method of manufacturing a window transparent to electron rays and an X-ray device with such a window.
Abstract:
An X-ray beam emitter including a vacuum chamber having a target window. An electron generator is positioned within the vacuum chamber for generating electrons that are directed at the target window for forming X-rays. The X-rays pass through the target window in an X-ray beam.
Abstract:
An emitter for a miniature X-ray apparatus comprises an insulating shell, an anode, and a cathode. The insulating shell includes a conical brazing surface, brazed to a conical brazing surface on the anode. The braze consists of a pure titanium layer and a pure tin layer. During brazing, the pure metals react and bond to the insulating shell and create a titanium-tin alloy between the pure layers. Pure tin is sputtered from tin sputter target onto the exposed brazing surfaces of the cathode cap and the anode. The insulating shell is placed in a vacuum chamber of deposition applicator, which deposits an active metal onto the shell brazing surface. In a brazing oven, the anode is placed within insulating shell such that the anode conical brazing surface and the shell conical brazing surface are contacting and aligned with each other. During brazing, the cathode is brought into contact with the insulating shell. The sealed emitters are placed in a sputtering machine's vacuum chamber. A metal is sputtered from a sputtering target to form a metal layer on the exterior of insulating shell.
Abstract:
By arranging for a collection of different materials to be used as x-ray targets in a single x-ray generator tube, an X-ray generator that can transmit a collection of unique x-ray spectra is produced according to one embodiment of the present invention. Spectrum selection can be accomplished by electronic means (with great speed) by deflecting an electron beam by means of electric fields, magnetic fields, and any combination of the two.
Abstract:
An x-ray generating device includes at least one field-emission cathode having a substrate and incorporating nanostructure-containing material including carbon nanotubes. The device further includes at least one anode target. Associated methods are also described.
Abstract:
An x-ray emitting system and method for administering a predetermined x-ray dose rate are provided. The system includes an x-ray emitter, a controller operably connected to the x-ray emitter, a current sensor operably connected to the controller, and a voltage sensor operably connected to the controller. The controller determines an actual dose rate based on a received current sensor signal and a received voltage sensor signal and adjusts a supplied voltage to allow the actual dose rate to match a predetermined dose rate. The method of operating a device for emitting x-rays includes: applying a voltage from a voltage source to the device, measuring current and voltage within the device, determining an actual dose rate based on the measured current and voltage, comparing a desired dose rate to the actual dose rate, adjusting the applied voltage, and matching the actual dose rate to the desired dose rate.
Abstract:
An X-ray anode is produced by scoring at least a region of a surface of the anode, on which electrons are incident, with a number of defined microslits, thereby making the surface, or at least the region thereof, highly thermally stressable.
Abstract:
A microfocus X-ray tube is provided, and comprises a head that during operation of the X-ray tube faces an object that is to be inspected. The head has an outer surface with a cross-section that tapers toward a free end of the head. A target is disposed on or in the head. A mechanism is provided for forming an electron beam adapted to bombard the target, and forms the electron beam such that the X-ray tube has a focus with a diameter of null200 nullm. The target has an outer surface with a cross-section that tapers toward an end of the target that during the operation of the X-ray tube faces an object that is to be inspected. A collimator can be provided for the target and also has an outer surface with a cross-section that tapers toward an end of the collimator that during operation of the X-ray tube faces an object that is to be inspected.
Abstract:
A structure to generate x-rays has a plurality of stationary and individually electrically addressable field emissive electron sources with a substrate composed of a field emissive material, such as carbon nanotubes. Electrically switching the field emissive electron sources at a predetermined frequency field emits electrons in a programmable sequence toward an incidence point on a target. The generated x-rays correspond in frequency and in position to that of the field emissive electron source. The large-area target and array or matrix of emitters can image objects from different positions and/or angles without moving the object or the structure and can produce a three dimensional image. The x-ray system is suitable for a variety of applications including industrial inspection/quality control, analytical instrumentation, security systems such as airport security inspection systems, and medical imaging, such as computed tomography.