Diamond monochromators for APS undulator-A beamlines

Blasdell, R. C.; Assoufid, Lahsen; Mills, Dennis M.

doi:10.2172/114555

Cited by 3 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretical estimates of efficiency of the diamond monochromators are presented in [21], the first practical application of diamonds for monochromatization of SR beam was performed at the ESRF European Synchrotron Radiation Facility (Grenoble, France) [22][23][24]. Later, diamond monochromators were mounted on high-brilliance undulator channels at the APS (USA) [25] and Spring-8 (Japan) sources [26,27]. Diamond has a high heat capacity and a good thermal conductivity, it is stable to X-ray radiation; thus, diamond monochromators are ideal for the application on high intensity SR beams.…”

Section: Equipment Of Experimental Stations For High Precision Powdermentioning

confidence: 99%

High precision X-ray diffraction studies of polycrystalline materials on synchrotron radiation

Shmakov

2012

J Struct Chem

View full text Add to dashboard Cite

The review is devoted to application of synchrotron radiation (SR) for studying the structure of polycrystalline materials. The main emphasis is made on the equipment and techniques for acquiring high precision structural information -high angular resolution powder diffractometry and the use of anomalous scattering effect in structural studies. Various schemes of recording the high resolution X-ray patterns are presented, diffractometers operating in the world's leading synchrotron radiation centers are described, and examples of particular applications are reported. S134 space, simplicity and reliability of such X-ray radiation source provided its wide use. X-ray tubes with Ti, Cr, Fe, Co, Ni, Cu, Mo and Ag anodes are intensively employed in modern lab-scale diffractometers.The radiation intensity of X-ray tube is limited by the efficiency of heat removal from the anode. At the average anode current of 100 mA and voltage of 100 kV, a 10 kW power is released at the ∼1 mm 2 anode area. In the process, no more than 3% of the power is re-emitted in the X-ray range. Such mode of operation can be provided only by the tubes with a rotating anode, where the released power is distributed over a large surface area of the anode. At the same time, intensity of the radiation source determines numerous parameters of an X-ray diffractometer -the acquisition time of X-ray pattern, angular resolution, sensitivity of X-ray diffraction analysis, accuracy of experimental data, etc. Improvement of the source would open a way to radically new possibilities of X-ray diffraction studies.In the middle of the last century, the development of elementary particle physics resulted in creating the cyclic accelerators and then the storage rings, where charged high-energy particles follow the closed trajectories and collide at a site where beams meet to generate fluxes of particles -products of the interaction. Such experimental scheme provides a double gain in energy as compared to the case when accelerated particles are directed to a stationary heavy target. The particle flux density in counter beams is much lower than density of the target, so the probability of particles collision is also much lower. Nevertheless, the multiple -several million times a second -repetition of beam collisions gives an acceptable statistics for reasonable times. If the colliding particles have equal weights and opposite charges, counter beams can be stored in a single ring chamber, dimensions of the setup being halved at the retained energy of the particles. Cyclic colliders are very productive devices for elementary particle physics; however, a serious problem arose at the early stage of their applicationlosses of particle energy for radiation [4].Motion of a charged particle along a curved trajectory is accompanied by emission of electromagnetic radiation, the so-called magnetodeceleration or synchrotron radiation. Designers of cyclic accelerators tried to minimize the radiation losses, which resulted mainly in an increased size of setups; these losses were c...

show abstract

Section: Equipment Of Experimental Stations For High Precision Powdermentioning

confidence: 99%

High precision X-ray diffraction studies of polycrystalline materials on synchrotron radiation

Shmakov

2012

J Struct Chem

View full text Add to dashboard Cite

show abstract

“…The disadvantage of diamond, besides the obvious one of obtaining large perfect single crystals, is that the wavelength-integrated reflectivity of the (111) diamond reflection is about half that of silicon (111). [For an overview of the diffraction properties of diamond, see Blasdell, Assoufid & Mills (1995).] Nonetheless, because diamonds do not require the complicated cryogenic cooling systems of silicon monochromators, have excellent reflectivity (albeit over a smaller angular or energy range), and can in principle be used in tandem (the transmitted beam can be used as the incident beam for other monochromators further downstream), they are an appealing option for some users of third-generation hard-X-ray sources.…”

Section: Figurementioning

confidence: 99%

X-ray Optics Developments at the APS for the Third Generation of High-Energy Synchrotron Radiation Sources

1997

J Synchrotron Radiat

View full text Add to dashboard Cite

Third-generation hard-X-ray synchrotron radiation sources simultaneously provide both a need and an opportunity for the development of new short-wavelength optical components. The high power and power densities of the insertion-device-produced X-ray beams have forced researchers to consider what may seem like exotic approaches, such as cryogenically cooled silicon and highly perfect diamond crystals, to mitigate thermal distortions in the first optical components. Once the power has been successfully filtered while maintaining the high beam brilliance, additional specialized optical components can be inserted into the monochromatic beam that take advantage of that brilliance. This paper reviews the performance of such optical components that have been designed, fabricated and tested at the Advanced Photon Source, starting with high-heat-load components and followed by examples of several specialized devices, such as an meV resolution (in-line) monochromator, a high-energy X-ray phase retarder and a phase-zone plate with submicrometer focusing capability.

show abstract

Test of a high-heat-load double-crystal diamond monochromator at the Advanced Photon Source

Fernández¹,

Graber²,

Lee³

et al. 1997

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

Diamond monochromators for APS undulator-A beamlines

Cited by 3 publications

References 8 publications

High precision X-ray diffraction studies of polycrystalline materials on synchrotron radiation

High precision X-ray diffraction studies of polycrystalline materials on synchrotron radiation

X-ray Optics Developments at the APS for the Third Generation of High-Energy Synchrotron Radiation Sources

Test of a high-heat-load double-crystal diamond monochromator at the Advanced Photon Source

Contact Info

Product

Resources

About