X-ray or gamma ray systems or devices – Specific application – Diffraction – reflection – or scattering analysis
Patent
1990-12-14
1992-10-20
Howell, Janice A.
X-ray or gamma ray systems or devices
Specific application
Diffraction, reflection, or scattering analysis
378 73, 378 70, 378 84, G21K 106
Patent
active
051577020
ABSTRACT:
A double-crystal X-ray monochromator includes entrance and exit crystal assemblies mounted on a support structure to provide full parallelism of the crystals while one crystal is rotated and the other rotated and translated with respect to the first, allowing selection of the wavelength of X-rays to be passed through the monochromator. The monochromator is mounted in an ultra-high vacuum chamber by supports which pass through the vacuum chamber to support the monochromator independently of the vacuum chamber. Bearings supporting the monochromator provide very low friction to linear movement and rotation to allow high precision to be obtained. To compensate for the heating of the entrance crystal due to impingement of high energy X-rays on the crystal, the entrance crystal is cooled using a radiation heat transfer system which provides no physical contact between the radiator connected to the entrance crystal assembly and the heat transfer structure on the vacuum chamber. The exit crystal may be heated so that its temperature can be matched to that of the entrance crystal to allow the precision alignment of the crystals to be maintained.
REFERENCES:
patent: 4365156 (1982-12-01), Golovchenko et al.
J. A. Golovchenko, et al., "X-Ray Monochromator System for Use With Synchrotron Radiation Sources," Rev. Sci. Instru., vol. 52, No. 4, Apr. 1981, pp. 509-516.
D. M. Mills, et al., "A Fixed Exit Sagittal Focusing Monochromator Utilizing Bent Single Crystals," Nuclear Instruments and Methods in Physics Research, A246, 1986, pp. 356-359.
D. Shu, et al., "UHV Compatible Compact Double-Crystal Monochromator at BEPC Diffraction and Scattering Beamline 4B9A," Rev. Sci. Instrum., vol. 60, No. 7, Jul. 1989, pp. 2054-2057.
S. L. Hulbert, et al., "An Ultrahigh-Vacuum Multiple Grating Chamber and Scan Drive With Improved Grating Change," Nuclear Instruments and Methods in Physics Research, A291, 1990, pp. 343-347.
Article entitled "Chamber Allows Changes in Grating Position," Design News, Feb. 12, 1990, pp. 154-155.
Hicks John W.
Middleton Frederic H.
Howell Janice A.
Wisconsin Alumni Research Foundation
Wong Don
LandOfFree
Mechanically actuated double crystal monochromater does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mechanically actuated double crystal monochromater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mechanically actuated double crystal monochromater will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-199073