Monochromatic X-ray-induced thermal effect on four-reflection

HU Ling-Fei; GAO Li-Dan; LI Zhen-Jie; WANG Shan-Feng; SHENG Wei-Fan; LIU Peng; XU Wei

doi:10.1088/1674-1137/39/9/096004

Chinese Physics C> 2015, Vol. 39> Issue(9) : 096004 DOI: 10.1088/1674-1137/39/9/096004

Monochromatic X-ray-induced thermal effect on four-reflection

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Abstract：
The high energy resolution monochromator (HRM) is widely used in inelastic scattering programs to detect phonons with energy resolution, down to the meV level. Although the large amount of heat from insertion devices can be reduced by a high heat-load monochromator, the unbalanced heat load on the inner pair of crystals in a nested HRM can affect its overall performance. Here, a theoretical analysis of the unbalanced heat load using dynamical diffraction theory and finite element analysis is presented. By utilizing the ray-tracing method, the performance of different HRM nesting configurations is simulated. It is suggested that the heat balance ratio, energy resolution, and overall spectral transmission efficiency are the figures of merit for evaluating the performance of nested HRMs. Although the present study is mainly focused on nested HRMs working at ⁵⁷Fe nuclear resonant energy at 14.4 keV, it is feasible to extend this to other nested HRMs working at different energies.

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HU Ling-Fei, GAO Li-Dan, LI Zhen-Jie, WANG Shan-Feng, SHENG Wei-Fan, LIU Peng and XU Wei. Monochromatic X-ray-induced thermal effect on four-reflection [J]. Chinese Physics C, 2015, 39(9): 096004. doi: 10.1088/1674-1137/39/9/096004

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Received: 2015-01-20
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Monochromatic X-ray-induced thermal effect on four-reflection

Corresponding author: XU Wei,

Received Date: 2015-01-20

Accepted Date: 1900-01-01

Available Online: 2015-09-05

Abstract: The high energy resolution monochromator (HRM) is widely used in inelastic scattering programs to detect phonons with energy resolution, down to the meV level. Although the large amount of heat from insertion devices can be reduced by a high heat-load monochromator, the unbalanced heat load on the inner pair of crystals in a nested HRM can affect its overall performance. Here, a theoretical analysis of the unbalanced heat load using dynamical diffraction theory and finite element analysis is presented. By utilizing the ray-tracing method, the performance of different HRM nesting configurations is simulated. It is suggested that the heat balance ratio, energy resolution, and overall spectral transmission efficiency are the figures of merit for evaluating the performance of nested HRMs. Although the present study is mainly focused on nested HRMs working at ⁵⁷Fe nuclear resonant energy at 14.4 keV, it is feasible to extend this to other nested HRMs working at different energies.

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Monochromatic X-ray-induced thermal effect on four-reflection

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