On the use of superconducting shields to increase the uniformity of the magnetic field in solenoids

✍ Scribed by Yu.F. Bychkov; O.B. Tarutin; V.Yu. Uzlov

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 205 KB
• Volume: 15
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(75)90038-7

✦ Synopsis

The creation of undamped currents in superconductors on the application of an external magnetic field makes it possible to use superconducting shields to increase the field uniformity in solenoids. Solid laminated shields made of Nb-Ti superconductors have been used to increase the field uniformity at strengths up to 4 kOe, produced by superconducting electromagnets. 1 It has been shown that at 55 kOe a uniformity of 10 .4 in a volume of ~1 cm 3 can be achieved 2 by using a multilayer open-circuited tubular shield, made of 10 mm wide Nb3Sn strips stuck across a 40 mm wide ribbon of condenser paper.

We studied several variants of shields made of hard superconductors with different currents, in order to choose the optimum design of a tubular shield and to analyse the factors which influence its effectiveness. All shields were in the shape of tubes with id 10 and od 13 mm. They were placed in superconducting solenoids with inner diameter 13.5 mm and 60 mm long. Four types of shield were studied: