Design and test of the prototype high T/sub c/ current leads for the Large Hadron Collider orbit correctors

Abstract

Applied Superconductivity Conference, ASC this paper. simple design. The design, the test set up and the results are described in prototype has been built which combines a low heat loss with an extremely was made to investigate different types of high Tc leads. Since then, a could be made with high Tc material. In the recent past, a theoretical study have been designed for a very low current of about 25 amperes and the leads temperature. To minimize the heat loss through these leads, the magnets individually powered and each needs a pair of current leads to the ambient magnets to correct the orbit of the particle beams. These magnets will be The Large Hadron Collider (LHC) will need some 800 superconducting Abstract A. Ballarino, and A. Ijspeert Collider Orbit CorrectorsDesign and Test of the Prototype High Tc Current Leads for the Large Hadron ·&,U¢€ § BOB

Low-critical-current applications of high-Tc superconductors

“…The superconducting part of the current lead takes normally the form of a rod, soldered at both ends to metal bushes; a safety metal lead is put in parallel to the superconducting path in case of quench [14]. This design has some critical issues.…”

“…Taking some CERN current-lead types [14] as an example, it is possible to make calculations based on design parameters already achieved at IMCC. YBCO accounts for less than 30% of the total thermal conductance when using a stainless-steel sheet as a substrate.…”

“…YBCO accounts for less than 30% of the total thermal conductance when using a stainless-steel sheet as a substrate. The BiSCCO rod of Ballarino and Ijspeert [14], of 19.5 mm 2 cross-section (L = 100 mm) plus the associated 1.4 mm 2 stainless-steel wire (L = 822 mm), is reported to have a thermal load of 12.5 mW. A design making use of a stainless-steel strip of 8 mm 2 cross-section (t = 0.2 mm, L = 100 mm), supporting 2 x 0.125 mm thick layers of YBCO (.Jc = 100 A cm 2 ) would result in a thermal load of 29 mW; however, it is possible to achieve with YBCO thick films on metal substrates values of .J c = 400 A cm 2 , which would reduce the strip size and then the thermal load to = 10 mW.…”

Processing of textured BSCCO superconductors by laser-induced directional solidification

“…The development of technological applications based on high-T c superconductors requires the use of texturing methods in order to overcome the intrinsic limitations of these materials. Between these applications, high-T c current leads based on BSCCO, are already a commercial reality and are available from several industrial sources [1]. These current lead elements are based on meltcast, or similarly processed, 2212 BSCCO phase, which yields elements with integrated, low-resistance Ag electrical contacts.…”