Magnetic Field Optimization and Tolerance Study of a Medical Superconducting Cyclotron

Modern packages for the design and simulation of cyclotron magnet systems, such as Tosca, CST Studio, Comsol, etc., combined with recent hardware of high performance, allow us to simulate and estimate even a subtle impact on the magnetic field distribution caused by small details and other systems of the accelerator. Such reckoning provides the data to perform and simulate the refilnement of the magnet called the ‘shimming’. That means a signifilcant part of the commissioning stage could be done in ‘virtual reality’. This could substantially decrease the duration of the shimming procedure of the real magnet and the amount of the material wasted on it, eventually this results in a fileld of high-precision which could be compared to real one.

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Magnetic Field Calculations for the Proposed Superconducting Cyclotron at the University of Milan

IEEE Transactions on Nuclear Science ◽

10.1109/tns.1977.4328884 ◽

1977 ◽

Vol 24 (3) ◽

pp. 1168-1170 ◽

Cited By ~ 4

Author(s):

E. Acerbi ◽

G. Bellomo ◽

M. Castiglioni ◽

C. De Martinis ◽

E. Fabrici

Keyword(s):

Magnetic Field ◽

Superconducting Cyclotron ◽

The University

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Magnetic Field Measurements in the MSU 500 MeV Superconducting Cyclotron

IEEE Transactions on Nuclear Science ◽

10.1109/tns.1979.4329817 ◽

1979 ◽

Vol 26 (2) ◽

pp. 2111-2113 ◽

Cited By ~ 4

Author(s):

P. Miller ◽

H. Blosser ◽

D. Gossman ◽

B. Jeltema ◽

D. Johnson ◽

...

Keyword(s):

Magnetic Field ◽

Field Measurements ◽

Superconducting Cyclotron ◽

Magnetic Field Measurements

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Three-dimensional analytic model of the magnetic field for the Chalk River superconducting cyclotron

IEEE Transactions on Magnetics ◽

10.1109/20.305604 ◽

1994 ◽

Vol 30 (4) ◽

pp. 1839-1842

Author(s):

W.G. Davies ◽

G.E. Lee-Whiting ◽

S.R. Douglas ◽

G.D. Pusch

Keyword(s):

Magnetic Field ◽

Three Dimensional ◽

Analytic Model ◽

Superconducting Cyclotron ◽

The Magnetic Field

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Radial Magnetic Field Optimization of the 5 T Superconducting Cyclotron for Medical Application

2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD) ◽

10.1109/asemd49065.2020.9276125 ◽

2020 ◽

Author(s):

Zou Wu ◽

Kaizhong Ding ◽

Changle Feng ◽

Yuntao Song

Keyword(s):

Magnetic Field ◽

Medical Application ◽

Radial Magnetic Field ◽

Superconducting Cyclotron

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Research on the effect of magnet parameters on the isochronous field of a superconducting cyclotron

Nuclear Technology and Radiation Protection ◽

10.2298/ntrp190130025z ◽

2019 ◽

Vol 34 (3) ◽

pp. 222-230

Author(s):

Pengyan Zhou ◽

Kaizhong Ding ◽

Junjun Li ◽

Shiwen Xu ◽

Yuntao Song

Keyword(s):

Magnetic Field ◽

Magnet System ◽

Magnet Design ◽

Superconducting Coil ◽

Superconducting Cyclotron ◽

Long Time ◽

Sector Angle ◽

Spiral Angle ◽

The Magnetic Field ◽

Complicated Task

It is a complicated task to obtain an isochronous field of a cyclotron magnet. Due to non-linear property of iron, iterated simulation of magnet design takes a long time to get an isochronous field. As an example, for a magnet design of a 240 MeV (SC240) superconducting cyclotron, the effect of main parameters of a magnet system on the magnetic field was studied, among them the azimuthal sector width, the spiral sector angle, the gap between sectors, the depth of valley region, the position of the coil, the shape of the coil and the excited current of the superconducting coil. It was found that the azimuthal average magnetic field can be increased by any of the following methods, including enlarging azimuthal width, increasing excited current of the superconducting coil, narrowing of the gap between sectors, reducing the depth of the valley region or decreasing the distance between the coil and the mid-plane. In addition, axial oscillation frequency can be improved by increasing the spiral angle, the depth of the valley region, or decreasing the gap between sectors.

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Magnetic-field strengths from optical polarization data

Symposium - International Astronomical Union ◽

10.1017/s0074180900101263 ◽

1967 ◽

Vol 31 ◽

pp. 381-383

Author(s):

J. M. Greenberg

Keyword(s):

Magnetic Field ◽

Optical Polarization ◽

Polarization Data ◽

Term Model ◽

Source Of Information ◽

Field Strengths

Van de Hulst (Paper 64, Table 1) has marked optical polarization as a questionable or marginal source of information concerning magnetic field strengths. Rather than arguing about this–I should rate this method asq+-, or quarrelling about the term ‘model-sensitive results’, I wish to stress the historical point that as recently as two years ago there were still some who questioned that optical polarization was definitely due to magnetically-oriented interstellar particles.

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