The State of the art with Canted Cosine Theta (CCT) magnets



Glyn Kirby (CERN)


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The first concept of a Canted Cosine Theta [CCT] magnet was published in the 1960's. CCT magnets can produce accurate field quality in any preferred direction. From simple solenoids, axial field (canted angle of 90°), fully transverse clean dipoles or high order correctors. The concept also allows to build magnets with combined functions like a dipole + quadrupole where the field is generated by a single wire or cable following a waviness path, resulting in extreme field shapes, as shown in the example. The CCT concept is currently becoming very popular within medical beam therapy, like e.g. the gantry magnets or small radius accelerator rings. Standard bent dipole magnets can produce unwanted quadrupole fields while the CCT concept allows to cancel this effect by using the idea of combined function. The LBNL has first proposed to use the CCT concept for high field magnets with the idea to well control high mechanical stresses in the coil.  

In 2016, CERN has proposed to design a 3T, 2.2 m long D2 orbit corrector based on the CCT concept. This magnet has a twin 105 mm aperture and a weight of 4 tonnes. After a challenging development period and several model magnets, the first HL-LHC MCBRD-CCT has successfully been tested in SM18. The magnet produced by the Chinese industry has shown outstanding memory after the maritime transportation from China. In the past 6 years the CCT magnets are becoming very popular, many applications are profiting from this elegant concept with reduced complexity in terms of design, and advantages in the simple construction and required manufacturing tooling.

The seminar will provide an overview on the concept and will focus on various amount of CCT design from the growing community. It will further provide an insight on the coil optimization for the different configurations and will highlight the challenges in the manufacturing, especially for the HL-LHC MCBRD corrector magnet.



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Friedrich Lackner
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Macarena Gonzalez Torres
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