Variable-sagittal-radii elliptical x-ray crystal spectrometers for high-neutron-yield plasma diagnostics

被引：0

作者：

Stoupin, S. ^{[1
]}

Sagan, D. ^{[2
]}

MacPhee, A. G. ^{[1
]}

Kozioziemski, B. ^{[1
]}

MacDonald, M. J. ^{[1
]}

Schneider, M. B. ^{[1
]}

Meamber, M. F. ^{[1
]}

May, M. J. ^{[1
]}

Heeter, R. F. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Cornell Univ, Ithaca, NY 14853 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2024年 / 95卷 / 08期

关键词：

SPECTROSCOPY; SPECTROGRAPH; PERFORMANCE;

D O I：

10.1063/5.0218387

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Sagittally focusing x-ray crystal spectrometers with elliptical profiles in the meridional (x-ray dispersion) plane are proposed for plasma diagnostics in experiments accompanied by high neutron yields. The spectrometers feature a variable sagittal radius of curvature to ensure the sagittal focusing of rays for each photon energy in a chosen detection plane. The detector is placed after the ray crossing point at the second ellipse focus, and the source-to-detector distance is maximized to reduce the neutron-induced background. The elliptical shape imposes a limitation on the spectrometer geometry such that the influence of the source size on the spectral resolution can be avoided only for a demagnifying spectrometer (the source-to-crystal distance is larger than that of crystal-to-detector). Hence, two designs are proposed. The first design, featuring high magnification and limited spectral resolution can be suitable for x-ray continuum spectroscopy. The second design of high demagnification is optimized for spectral resolution, and can be used for time-resolved spectroscopy of plasma's characteristic emission lines using streak cameras. The key performance characteristics of the two designs are verified using ray tracing.

引用

页数：6

共 15 条

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