Superconducting magnet for a cyclotron Rutherford backscattering spectrometry system
Abstract
We have developed a superconducting magnet for a high-speed and high-resolution Rutherford backscattering spectrometry system that utilizes the ion motion along the cyclotron trajectory in a magnetic field. The superconducting magnet without cryogen consists of a main coil, shim coils, a 4 K refrigerator and pole pieces. It generates a 2 T magnetic field in the spectrometer of ϕ 340 × 750 mm. The shapes of the pole pieces and the coil arrangements are optimized by a magnetic field analysis to generate a uniform field. The magnetic field distribution is made to be so uniform that the scattered ions can pass through a ϕ 1 mm aperture, by ion trajectory calculation. The trajectory of the incident beam is also computed, and the position of a specimen holder is determined so that the incident beam is well focused on the specimen.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- August 2006
- DOI:
- 10.1016/j.nimb.2006.04.011
- Bibcode:
- 2006NIMPB.249..261I
- Keywords:
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- Superconducting magnet;
- Spectrometer;
- Rutherford backscattering spectroscopy;
- Cyclotron trajectory;
- 07.81