Concept for new magnet type published in IEEE Transactions

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3D field inside the CCT magnet (Image credit: V. Rodin and G. Kirby)

In a paper recently published in IEEE Transactions on Applied Superconductivity, Glyn Kirby together with members of our QUASAR Group Volodymyr Rodin, and Carsten Welsch have presented a new concept for a 2.2 T Curved Cosine Theta (CCT) magnet for the future HIE-ISOLDE Superconducting Fragment Separator (ISRS).

The recent development of radioactive beam facilities, such as the HIE-ISOLDE facility at CERN, delivers the largest range of low-energy radioactive beams, exploited by several detector systems to investigate nuclear properties from the stable isotopes to the very exotic systems close to the neutron or proton drip lines.

Compact, low-cost, curved multi-function superconducting magnets with a large aperture are needed to contain the large emittance circulating beam of reaction fragments. This will allow to store several light/heavy radioisotopes simultaneously and to separate them from the main beam.

The designed magnet plays a key role in the proposed concept of the spectrometer. The demanding features that led to the selection of the CCT coil are extreme field profile flexibility, compact coil, and the short distance from the coil to the end of the magnet support. For low field magnets up to about 5 T, the CCT concept offers significant cost savings over more traditional collared coil designs.

This magnet is expected to provide great flexibility in the operation of the HIE-ISOLDE spectrometer across various modes of operation. Additionally, it will provide vital experience in the operation of CCT magnets for the HL-LHC team, which plans to utilize a similar technology as part of future upgrades.


Further information:

G. Kirby et al., "Superconducting Curved Canted–Cosine–Theta (CCT) for the HIE-ISOLDE Recoil Separator Ring at CERN," in IEEE Transactions on Applied Superconductivity, vol. 32, no. 6, pp. 1-5, Sept. 2022, Art no. 4004105, 10.1109/TASC.2022.3158332.