Evaluation of a new VUV/soft x-ray toroidal grating monochromator with a movable exit slit : Proceedings of the 4th international conference on synchrotron radiation instrumentation
Mancini, D. C. ; Bissen, M. ; Rioux, D. ; Patel, R. ; Rogers, G. ; Brodsky, E. L. ; Höchst, H.
[S.l.] : American Institute of Physics (AIP)
Published 1992
[S.l.] : American Institute of Physics (AIP)
Published 1992
| ISSN: |
1089-7623
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
Electrical Engineering, Measurement and Control Technology
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| Notes: |
The performance of a toroidal grating monochromator can be significantly improved by compensating for the wavelength dependent defocusing aberration by means of a movable exit slit. Model calculations of a movable exit slit design show a resolving power that varies nearly linearly with wavelength over the scan range. The energy resolution follows the slope between two optimized resolution minima of a fixed slit TGM. The overall improvement in resolution due to the movable slit depends critically on the figure error of the toroid surface. The Al(LII,III) core edges provide a means to calibrate gratings and determine the resolution at 72.8 eV. A method is described for using the shift in core edge with exit slit position to enable final alignment of the exit slit motion providing stability of energy calibration of 2 meV over the scan range. Comparison of calculations and measured resolution suggests that slope errors remain the limiting factor in performance.
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| Type of Medium: |
Electronic Resource
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| URL: |