Status of the SC Magnets for the SIS100 Synchrotron and the NICA Project

The upcoming machines, the SIS100 accelerator and the NICA booster and collider are a direct offspring of the successful NUCLOTRON magnet concept. SIS100 is now being realized with the dipoles ordered. NICA is in its R&D stage with the first prototype magnets built. The experience gained in the GSI-JINR collaboration dedicated to improving the magnets during the last decade of R&D led now to the common agreement to realize the magnet production and testing in a cooperation for both projects. We describe the parameters, the optimization and tradeoffs made for these magnets and outline the differences. The status of the different magnets next to first results obtained on model or prototype magnets are given. Special attention is given to the advantages of cooling the superconducting magnets with a forced two-phase Helium flow.

I. Introduction

Fast ramped superconducting magnets produce a large amount of AC-losses that have to be removed by a stable cooling system. The Nuclotron accelerator, successfully operating since 20 years [1]–[3], chose to implement its system based on a forced two phase helium flowing in parallel cooling channels.