Experimental Techniques: Cryostat Design, Material by Jack Ekin

By Jack Ekin

This ebook offers a hugely built-in, step by step method of the layout and development of low-temperature size gear. it really is successfully books in a single: A textbook on cryostat layout innovations and an appendix info guide that offers materials-property information for conducting that layout. the most textual content includes a wide variety of data, written for experts, with out leaving starting scholars in the back of. After summarizing cooling tools, half I presents center info in an obtainable type on ideas for cryostat layout and fabrication - together with heat-transfer layout, choice of fabrics, development, wiring, and thermometry, observed via many graphs, information, and transparent examples. half II offers a pragmatic user's standpoint of pattern mounting concepts and make contact with expertise. half III applies the knowledge from elements I and II to the size and research of superconductor severe currents, together with in-depth dimension recommendations and the newest advancements in information research and scaling idea. The appendix is a prepared reference guide for cryostat layout, encompassing seventy tables compiled from the contributions of specialists and over fifty years of literature.

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Experimental Techniques: Cryostat Design, Material Properties and Superconductor Critical-Current Testing

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Additional info for Experimental Techniques: Cryostat Design, Material Properties and Superconductor Critical-Current Testing

Sample text

Magnetic-field angle? Then it may be necessary to design special flexible current connections to the sample (Sec. 10) and incorporate some clever mechanics (Sec. 2). Magnetic field 9. 2 T)? Life is much simpler than at high fields; we do not have to put a lot of effort into making the apparatus compact so it will fit in the small bore of a high field magnet. Furthermore, if transport currents are small, a commercial liquid-flow cryostat or cryocooler of modest cooling power can be used. 6). 10. Will measurements be carried out, on the other hand, in high magnetic fields (տ 1 T)?

14. Will mechanical measurements be made at high magnetic fields (տ 1 T)? Similar to the case for magnetic measurements, particular attention must then be paid to constructing the movable cryostat parts from materials that will not experience significant magnetic forces (this usually eliminates stainless steels and requires the use of very low susceptibility materials such as titanium, aluminum alloys, and phosphor bronze). For this case, the magnetic susceptibility of the cryostat construction materials is a principal design parameter (Sec.

A second design factor (which can become primary in many circumstances) is to decide on the electric-current range needed. In high-current sample testing (such as applies to most bulk superconductors), currents of several hundred to several thousand amperes are common, whereas for low-current measurements (such as thin-film samples), currents rarely exceed several hundred milliamperes. The two cryostats look very different, the first with large vaporcooled leads and built to handle large forces, the second light and delicate with small current leads and miniature connectors.

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