Superconducting toroidal combined-function magnet for a compact ion beam cancer therapy gantry

Robin, D.; Arbelaez, Diego; Caspi, S.; Sun, Changchun; Sessler, Andrew M.; Wan, Weishi; Yoon, M.

doi:10.1016/j.nima.2011.08.049

Cited by 33 publications

(27 citation statements)

References 13 publications

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“…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%

“…Digital Object Identifier 10.1109/TASC.2016.2628305 additional and different approaches to superconducting gantry magnet design [8]- [11], previous work at LBNL has focused on the use of the Canted-Cosine-Theta (CCT) concept [12]- [14] for the gantry's final bending magnet [15]- [17]. This paper will share the most recent developments of this effort by reporting on the design of a curved AG-CCT superconducting magnet.…”

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confidence: 99%

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Design of an Achromatic Superconducting Magnet for a Proton Therapy Gantry

Brouwer

Caspi

Hafalia

et al. 2017

IEEE Trans. Appl. Supercond.

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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.

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Section: B Four Layer Magnetic Designmentioning

confidence: 99%

mentioning

confidence: 99%

Design of an Achromatic Superconducting Magnet for a Proton Therapy Gantry

Brouwer

Caspi

Hafalia

et al. 2017

IEEE Trans. Appl. Supercond.

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“…Previous superconducting gantry design at LBNL has focused on the need for a curved combined function final bending magnet [8,18]. 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.…”

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

confidence: 99%

“…The detailed winding pattern associated with this parametrization can be readily visualized by transforming to Cartesian coordinates. (For more details, see [8].) The winding coefficients C n , which determine the degree of axial modulation of the path, were numerically optimized for each pair of layers with the figure of merit being a local cylindrical expansion of the fields on a reference radius from the center of the bore compared to the desired SCOFF model harmonics.…”

Section: A Magneticsmentioning

confidence: 99%

“…Apart from increased complexity in technology, the main drawback of the superconducting magnets is their slow ramping speed of the field compared to that of the resistive magnets. To that end, our previous design [8] using weak focusing superconducting bending magnets and the superconducting carbon gantry being developed at NIRS/Toshiba [9][10][11][12] are both limited in depth scanning speed.…”

Section: Introductionmentioning

confidence: 99%

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

Wan

Brouwer

Caspi

et al. 2015

Phys. Rev. ST Accel. Beams

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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.

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