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Equalizing method of beam emittance

A balanced method and emissivity technology, applied in X-ray/γ-ray/particle irradiation therapy, radiation/particle treatment, nuclear engineering, etc., to achieve the effect of weight reduction, cost reduction and manufacturing difficulty

Inactive Publication Date: 2011-08-24
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a beam emittance equalization method to solve the problem of how to equalize the beam emittance in the horizontal and vertical directions, and make the beam after emittance equalization not follow The angle of the rotating gantry varies as the

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  • Equalizing method of beam emittance

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] The beam emittance equalization method provided by the present invention is obviously different from the beam emittance equalization method mentioned in the background art. On the one hand, the corresponding beam energy is much higher; on the other hand, it has to face a more complicated situation, because the rotating gantry used in proton therapy or heavy ion therapy happens to be a kind of beam that will generate energy around the longitudinal axis. For rotating equipment, when the solenoid is used with the rotating frame, the coupling effect on the beam current is more complicated and difficult to handle. It has been shown through research that when there are no other elements between the solenoid and the rotat...

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Abstract

The invention discloses an equalizing method of beam emittance, including the followings: according to the beam type and energy, one of plain solenoid, superconducting solenoid and beam gyrator is used as an emittance equalizing unit; the mounting space of the emittance equalizing unit is arranged on the beam transmission line; the inlets of the emittance equalizing unit and the gyrator respectively carries out matching of TWISS parameters so that the TWISS parameters in horizontal phase space and vertical phase space are equal; a required beam angle of rotation is set for the emittance equalizing unit; normal beam spot size matching is carried out, and the matching of beam slope angle in real space X-Y phase plane of beam cross-section is carried out; and when the energy of curing beam is changed, the magnetic setting of the beam emittance equalizing unit is simultaneously adjusted with the whole beam transmission system. The application of the invention can carry out equalizing process for beam emittance in horizontal and vertical directions so that the beam optics remains the same in the gyrator.

Description

technical field [0001] The invention relates to the technical field of beam emittance equalization, in particular to a beam emittance equalization method. Background technique [0002] The principle of the beam emittance equalization method is as follows: use one or a group of solenoids to rotate the beam around the longitudinal axis, thereby generating coupling effects in the horizontal and vertical directions, and changing the excitation intensity of the solenoids can change Beam rotation angle and coupling effects. If the TWISS parameters at the solenoid inlet are equal in the horizontal direction and the vertical direction, the emittance of the two can be balanced when the beam rotation angle is 45° while the sum value remains unchanged. The method of using a solenoid to rotate the beam by 45° to balance the original unequal emittance in the transverse phase space in the case of constant sum value has been reported, but it is used in the case of very low beam energy, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21K1/093A61N5/10
Inventor 唐靖宇方守贤关遐令
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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