Overview of polycapillary X-ray optics

2002 ◽  
Vol 17 (2) ◽  
pp. 70-80 ◽  
Author(s):  
Paul J. Schields ◽  
David M. Gibson ◽  
Walter M. Gibson ◽  
Ning Gao ◽  
Huapeng Huang ◽  
...  
Keyword(s):  
Focal Spot ◽  
State Of The Art ◽  
Substantial Reduction ◽  
Spot Size ◽  
Source Size ◽  
Total External Reflection ◽  
X Rays ◽  
Focal Spot Size ◽  
Polycapillary Optics ◽  
X Ray

Polycapillary optics are utilized in a wide variety of applications and are integral components in many state of the art instruments. Polycapillary optics operate by collecting X-rays and efficiently propagating them by total external reflection to form focused and parallel beams. We discuss the general parameters for designing these optics and provide specific examples on balancing the interrelations of beam flux, source size, focal spot-size, and beam divergence. The development of compact X-ray sources with characteristics tailored to match the requirements of polycapillary optics allows substantial reduction in size, weight, and power of complete X-ray systems. These compact systems have enabled the development of portable, remote, and in-line sensors for applications in industry, science and medicine. We present examples of the utility and potential of these optics for enhancing a wide variety of X-ray analyses.

The determination of the focal spot size of an X-ray tube from the radiation beam profile

2015 ◽  
Vol 82 ◽  
pp. 138-145 ◽  
Author(s):  
A.D. Oliveira ◽  
M.J. Fartaria ◽  
J. Cardoso ◽  
L.M. Santos ◽  
C. Oliveira ◽  
...  
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Beam Profile ◽  
Focal Spot Size ◽  
Radiation Beam ◽  
X Ray

scholarly journals 221. Effect of grid bias voltage on the focal spot size of microfocus X-ray tube

1993 ◽  
Vol 49 (8) ◽  
pp. 1246
Author(s):  
Seiichi Mimura ◽  
Noriaki Akagi ◽  
Fumie Kimura ◽  
Shigefumi Kadohisa ◽  
Yasutaka Mikami ◽  
...  
Keyword(s):  
Bias Voltage ◽  
Focal Spot ◽  
Spot Size ◽  
Focal Spot Size ◽  
X Ray

Measurement of the effective focal spot size of an x-ray computer tomograph

1991 ◽  
Vol 25 (6) ◽  
pp. 286-288
Author(s):  
É. I. Rader ◽  
B. S. Reznikov ◽  
A. E. Maslov
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Focal Spot Size ◽  
Computer Tomograph ◽  
X Ray

X-Ray Point Focusing Using Cylindrically Bent Crystals with Modulated Structures for Synchrotron X-Ray Beams

1995 ◽  
Vol 39 ◽  
pp. 103-107
Author(s):  
W. Z. Chang ◽  
F. N. Chukhovskii ◽  
E. Förster
Keyword(s):  
Spot Size ◽  
X Rays ◽  
Crystal Surfaces ◽  
Focal Spot Size ◽  
Rocking Curve ◽  
Reflection Curve ◽  
X Ray ◽  
Modulated Structures ◽  
Fresnel Lenses ◽  
Bent Crystals

Micron or submicron spatial resolution for x-ray microfluorescence analysis has been pursued using various x-ray point focusing methods,1-4 such as transmission zone plates, tapered capillaries, and Bragg Fresnel lenses. Point focusing using bent crystals does not seem to be a desirable means for achieving a microbeam size, although it is a traditional technique which utilizes perfectly curved crystal surfaces to focus x rays emanating from the source. It is known that point focusing can only be achieved by bending a crystal two dimensionally, which normally introduces imperfections to the crystal since the crystal is an undevelopable surface. Unavoidably, the introduced imperfections will broaden the reflection curve (rocking curve) of the crystal and, in turn, broadens the focal spot size.

High-Intensity Rotating Anode X-Ray Tubes

1965 ◽  
Vol 9 ◽  
pp. 194-201
Author(s):  
A. Taylor
Keyword(s):  
Power Dissipation ◽  
Rotational Speed ◽  
High Intensity ◽  
High Pressures ◽  
Focal Spot ◽  
Spot Size ◽  
Focal Spot Size ◽  
X Ray

AbstractDemountable rotating anode X-ray tubes with a 7½ kW power dissipation have been built for conventional diffraction work with powder cameras and equi-inclination Weissenberg goniometers, and for use with a tetrahedral press for studying crystalline matter at ultra-high pressures. The tubes employ a highly compact cooling and sealing arrangement on the rotating anode which enables four windows to be used with the focal spot close to the specimen. A rotational speed of 1750 rpm with a focal spot size of 10 × 1 mm enables the tubes to be operated at 250–275 mA at 30 kV DC or at 150 mA, 50 kV DC.

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