Proton therapy for the treatment of cancers adopts a rotating system called gantry to irradiate the tumor from any direction. The gantry system consists of different beam line magnets that bend the proton beam towards the patient. The use of superconducting magnets allows reducing the size and weight of the last bending section. During the gantry operation, it is necessary to change the...
A superconducting magnet able to provide the required field of 4 T has been developed for a compact cyclotron to produce radio isotopes for medical imaging, in the framework of AMIT project. It consists of two coils in Helmholtz configuration, embedded in a stainless steel casing to hold the Lorentz forces. The cooling scheme is based on a low pressure forced internal flow of two-phase...
We have designed a 4 tesla superconducting isochronous cyclotron for proton therapy. Its yoke weight is about 65 tons, which is less than one third of our normal-conducting 230 MeV cyclotron. Application of superconducting wire to cyclotron can contribute to reduction of dimension, initial costs, power consumption and lead time. The superconducting coils using NbTi wire are conduction-cooled...
For the applications of proton therapy and proton irradiation, and based on the R&D starting from 2009, a construction project of a 230 MeV superconducting cyclotron (CYCIAE-230) has been launched at China Institute of Atomic Energy (CIAE) since Jan 2015. A compact main magnet design with warm iron yokes and a superconducting coil system is adopted to reduce the size, and consequently to lower...
HUST proton therapy facility is a Major State Research & Development Program supported by MOST, China. This facility is based on an isochronous superconducting cyclotron with two gantry beam lines and one fixed beam line. This paper will discuss the beam optics and main magnetic elements including dipoles, quadrupoles and fast scanning magnets of the gantry beam line. As well as the Energy...
A proton therapy project HUST-PTF (HUST Proton Therapy Facility) based on a 250 MeV isochronous superconducting cyclotron was under development in Huazhong University of Science and Technology (HUST). In this paper we reported the main design considerations of the beam line in HUST-PTF project. As well as two prototype magnets (one quadrupole and one dipole) were designed. Two-dimensional...
Magnetic hyperthermia is expected as a thermal ablation cancer therapy. For the induction heating of the nano scale magnetic beads, the required specifications of the high frequency magnet are 0.06 T and 200 kHz of the AC magnetic field with 5 minutes of the continuous or intermittent operation time. However, the magnet system requires the enough bore size for the cancer therapy. Addition to...
Eight highly saturated dipole magnets have been developed for the Shanghai Advanced Proton Therapy booster. The field reaches 1.77 T at the design current of 1200 A. The homogeneity of the integrated field is better than 0.001 within a good field region width of 100 mm. The integrated field consistency for the 8 dipole magnets is better than 0.003. The design and the measurement results for...
Transcranial magnetic stimulation (TMS) is a modern technology for non-invasive modulation of the cortical tissue excitability in specific brain regions. Because of better focalization, planar Figure of Eight (FOE) coil is most widely used in magnetic stimulator nowadays, whereas it has two negative peaks besides the positive peak of interest and the ratio of peak value to negative peak value...
Dipole and Quadrupole magnets or a combination of both with rather strong magnetic fields are required in many medical applications. Although such magnets can be built with warm temperature electromagnets, under certain physical conditions such electromagnets can be replaced by Halbach type permanent magnets in combination with rather small inexpensive electromagnets to provide variability of...
Current proton therapy scanning systems always use two inde-pendent dipole magnets for spot scanning in proton therapy. However, the space occupied by these two dipole magnets locat-ed after the final gantry bending magnets is very large and in-creases the overall size of the gantry. In order to construct a compact nozzle and decrease the size of the gantry, we decide to design an octupole...
Started in Jan 2015, a 230 MeV superconducting cyclotron is under construction at China Institute of Atomic Energy for proton therapy. A compact main magnet design with warm iron yokes and a superconducting coil system is adopted to reduce the size, construction and operation cost of the cyclotron. In this paper, the field calculations of the main magnet are briefly described; then the R&D of...
