A beam rocking system for the Oxford nuclear microprobe: A new approach to channeling analysis
Abstract
This paper describes the design and implementation of a beam rocking system for the Oxford nuclear microprobe. This system varies the angle of incidence of a focused MeV ion beam on a sample using two set of dipole scan coils of equal and opposite fields, allowing the sample to remain fixed while the beam is rocked in angle about a small area. This method of producing angle-resolved channeling images and scans does not require any modifications to existing data-acquisition software nor the use of a high-precision motorized goniometer. Beam optics calculation results are presented for a beam rocking system using three different standard microprobe focusing systems. The maximum angular range of this system is 3.15°. Channeling images and measurements of angular rotation in a strained {Si 0.90Ge 0.10}/{Si} crystal are presented using this technique.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- September 1997
- DOI:
- 10.1016/S0168-583X(97)00315-7
- Bibcode:
- 1997NIMPB.129..534D