The developmental long trace profiler (DLTP) optimized for metrology of side-facing optics at the ALS
2014
The autocollimator and moveable pentaprism based DLTP [NIM A 616 (2010) 212-223], a low-budget, NOM-like
profiler at the Advanced Light Source (ALS), has been upgraded to provide fast, highly accurate surface slope metrology
for long, side-facing, x-ray optics. This instrument arrangement decreases sensitivity to environmental conditions and
removes the gravity effect on mirror shape. We provide design details of an affordable base tool, including clean-room
environmental arrangements in the new ALS X-ray Optics Laboratory with advanced temperature stabilization and
turbulence reduction, that yield measurements in under 8 hours with accuracy better than 30 nanoradians (rms) for super
polished,190 mm flat optics, limited mainly by residual temporal instability of the experimental set-up. The upgraded
DLTP has been calibrated for highly curved x-ray optics, allowing same day measurements of a 15 m ROC sphere with
accuracy of better than 100 nanoradians (rms). The developed calibration procedure is discussed in detail. We propose
this specific 15 m ROC sphere for use as a round-robin calibration test optic.
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