Abstract
A liquid He cooled two-axis goniometer was built to perform channeling measurements at temperatures down to 5 K. The rotation about the vertical axis is achieved by a rotatable He-vessel. The rotation about the sample surface normal is possible by a sample holder which is pressed against the He-vessel and driven via a worm gear. The precision of the vertical rotation is ±0.02°, the precision of the horizontal rotation is ±0.2°. To test the goniometer channeling measurements with 2 MeV He + ions on a Mo-single crystal at temperatures of 295 K, 77 K and 5 K have been performed. The measured minimum yields and critical angles are compared with calculated parameters obtained by Monte Carlo methods.
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More From: Nuclear Instruments and Methods In Physics Research
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