A thin film superconducting lens element for electron optics
article
The application of high Tc superconductors, especially thin films, for magnetic lenses is discussed. If a thin film is patterned with a spiral, a small coil is obtained which can be utilized as a magnetic lens. However, because of field strength and rotational symmetry requirements, a number of thus patterned thin films need to be stacked. The concept was first tested in a single YBa2Cu3O7-x layer patterned with a 50-turn spiral, having an outer diameter of 8 mm and an inner diameter of 2 mm. The width of the track was 50 um. The maximum current density obtained in this pattern was 3 x 1O-4 A cm-2 at 30 K. We also designed a pattern suitable for face-to-face stacking. The alignment of the two stack components with respect to each other will be done by means of capacitive position sensors which are integrated in the pattern.
TNO Identifier
282185
Source
Superconductor science and technology, 4, pp. 495-498.
Publisher
IOP
Collation
4 p.
Pages
495-498
Files
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