Design and tests of UNK superconducting correction magnet models

Abstract

At present NITEFA is designing superconducting correction magnets for UNK. UNK magnetic field correction system includes about 1500 various correction windings: dipole, quadmpole, sextupole and octupole. The magnet consisting of 3 concentric saddle type multipole coils with common iron yoke ("$pool-piecd'type) was selected aa basic one. Each of the correction coiIs has the next optical force: sextnpole-600 (T/ma).m, quadmpole-5.5 (T/m).m, dipole-0.68 Tern. Total length is about 1.6 m, operating cgrrent 520 A. The 4 full scale models of the baaic correction magnet with different types of conductors and various technique of winding have been built. This report describes the main design parametera of models and the particulars of their constmction. The results of manufacturing and tests (quench behavior and magnetic field meaanrements) are discussed.

Novel Design for a Superconducting Multipole Corrector Magnet

“…L ARGE numbers of different superconducting multipole correctors have been designed and manufactured for the Tevatron [1], UNK [2], RHIC [3], and LHC [4]. Unfortunately, some correctors have shown rather low mechanical stability, a long, operational training history, and have only worked at 30-60% of the short-sample current limit.…”

“…Correctors for the Tevatron have employed random windings, imprecise geometry, and, as a result, have had a long, operational training history [1]. For the UNK at the Efremov Institute, correctors initially used the same technology, but the coils had inner shorts as a result of damage to the enamel insulation during collaring [2]. Better results were achieved with a ribbon-type cable and a single wire technique applying an additional fiberglass insulation.…”