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To evaluate the heat distribution due to eddy losses in the pole end of the scanning magnet, the transient electromagnetic analysis and steady-state thermal analysis are performed.
A scanning magnet using high-temperature superconductor (HTS) wire was designed, built, and tested for its suitability as a beam scanner.
The gantry design places the toroidal magnet between the scanning magnets and the patient, that is the scanning magnets are placed midway through the gantry.
The scanning magnets are set between these two bending magnets, although the aperture of the 30° magnet increases.
This paper describes design considerations of the scanning system and mainly analyses the eddy current effect of the scanning magnets.
The experiment used two scanning magnets for X and Y deflection of the proton beam and covered a usable target area of nearly 1 m2.
By optimizing the coil winding configuration of this magnet, near point-to-parallel optics is achieved between the scanning magnets and the patient; while at the same time there is only a small distortion of the beam-shape when scanning.
In the beam line, the scanning system spreads out the proton beam on the target according to the complex tumour shape by two scanning magnets for horizontal and vertical scanning independently.
In order to reduce the energy loss and transverse scattering of 70 250 MeV proton beam in the nozzle, a gas-filled beam pipe in the nozzle is designed to take the beam through the scanning magnets.
The diagnosis of BMs was made by computed tomography (CT) scan or magnet resonance tomography (MRI).
The head of every animal was fixed in the same position with inbuilt earplugs, tooth bar and nose-mask, to assure the same placement within the magnet from scan to scan.
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