Combined function magnets using double-helix coils

Arbelaez

IEEE Trans. Appl. Supercond.

et al. 2018

Abstract-The Canted-Cosine-Theta is a design option for the next generation of high field superconducting dipoles being pursued within the US Magnet Development Program. This paper presents new modeling techniques developed for design and analysis of CCT magnets. For mechanical modeling in ANSYS, three approaches with increasing accuracy are compared: 2-D symmetry models; 3-D periodic symmetry models; and full 3-D models. Methods for the static and transient magnetic simulation using ANSYS are presented with a focus on circuit-coupled models for predicting magnet behavior following quench. Where applicable, simulation results are compared to data from CCT magnet tests at Berkeley.

Section: T He Us Magnet Development Program (Us-mdp) Is Pur-mentioning

confidence: 99%

Improved Modeling of Canted–Cosine–Theta Magnets

Arbelaez

IEEE Trans. Appl. Supercond.

et al. 2018

“…The CCT approach consists of multiple tilted conductor layers, usually in pairs, which are designed and powered such that their transverse fields sum and longitudinal fields cancel. This concept has been shown to be an effective method for producing single harmonic or combined function fields of accelerator quality in both straight and curved magnets [13]- [15], [19]- [22].…”

Section: B Four Layer Magnetic Designmentioning

confidence: 99%

Design of an Achromatic Superconducting Magnet for a Proton Therapy Gantry

IEEE Trans. Appl. Supercond.

Hafalia

et al. 2017

Abstract-Recent studies have shown that strong, alternating focusing magnets can be used to greatly increase the momentum acceptance of hadron therapy gantries. With the high gradients achievable with superconducting magnets a level of momentum acceptance can be reached which may have significant implications to medical gantries and to the introduction of superconducting technology in this area. The design of such a superconducting magnet system for a proton therapy gantry will be presented. The Canted-Cosine-Theta concept is extended to a curved magnet system generating the desired bending and alternating focusing fields for the achromatic optics. Magnetic, structural, and thermal analysis of this design is presented along with preliminary efforts towards fabrication and assembly of the curved magnet.

“…These studies have shown the feasibility and advantages of using the canted cosine theta (CCT) design [19][20][21][22][23][24][25] to generate desired field multipoles in a large aperture superconducting gantry magnet. Using the CCT approach, a novel magnet concept has been developed to produce the alternating focusing and defocusing fields needed for the achromatic gantry, which is described in detail in Sec.…”

Section: A Combined-function Efficient Alternating-gradient (Agmentioning

confidence: 99%

Alternating-gradient canted cosine theta superconducting magnets for future compact proton gantries

Wan

Phys. Rev. ST Accel. Beams

et al. 2015

We present a design of superconducting magnets, optimized for application in a gantry for proton therapy. We have introduced a new magnet design concept, called an alternating-gradient canted cosine theta (AG-CCT) concept, which is compatible with an achromatic layout. This layout allows a large momentum acceptance. The 15 cm radius of the bore aperture enables the application of pencil beam scanning in front of the SC-magnet. The optical and dynamic performance of a gantry based on these magnets has been analyzed using the fields derived (via Biot-Savart law) from the actual windings of the AG-CCT combined with the full equations of motion. The results show that with appropriate higher order correction, a large 3D volume can be rapidly scanned with little beam shape distortion. A very big advantage is that all this can be done while keeping the AG-CCT fields fixed. This reduces the need for fast field ramping of the superconducting magnets between the successive beam energies used for the scanning in depth and it is important for medical application since this reduces the technical risk (e.g., a quench) associated with fast field changes in superconducting magnets. For proton gantries the corresponding superconducting magnet system holds promise of dramatic reduction in weight. For heavier ion gantries there may furthermore be a significant reduction in size.