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Single-cycle multi-step active variable energy and slow extraction method of synchrotrons

A synchrotron, single-cycle technology, applied in radiation therapy, X-ray/γ-ray/particle irradiation therapy, treatment, etc., can solve problems such as affecting the stable operation and service life of equipment, increasing the difficulty of equipment maintenance, and wasting beam current. To achieve the effect of reducing pollution and waste, improving utilization efficiency, and reducing irradiation time

Active Publication Date: 2018-12-07
惠州离子科学研究中心 +1
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Problems solved by technology

This will cause serious beam waste, and the radiation caused by beam loss may also affect the stable operation and service life of the equipment, and even cause equipment activation, increasing the difficulty of equipment maintenance

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  • Single-cycle multi-step active variable energy and slow extraction method of synchrotrons

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] In a synchrotron, a typical operating cycle is usually figure 1 shown. First the beam is injected, then the beam is accelerated to an energy value E 1 , and then conduct slow extraction until the number of extracted particles reaches N 1 Then stop the slow extraction. After the slow extraction is over, the current rises to the maximum value (the main purpose of rising to the maximum value is to eliminate the hysteresis effect), and then drops to zero. This pulse period will provide energy for the terminal as E 1 , the number of particles is N 1 beam current (if the number of particles provided by one pulse1 , then continue to repeat the above process until the number of particles reaches N 1 ). Then provide en...

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Abstract

The invention provides a single-cycle multi-step active variable energy and slow extraction method of synchrotrons. The method comprises a step of injecting a beam current and then accelerating beam current energy to a maximum value, a step of decelerating the beam current to a first energy value E1 and performing slow extraction and stopping the extraction when the number of extracted particles reaches a predetermined number, a step of continuously decelerating the beam current to a second energy value E2 and performing slow extraction and stopping the extraction when the number of extractedparticles reaches a predetermined number, and a step of continuously lowering the energy value of the beam current step by step and performing slow extraction until a predetermined number of particleshaving an energy value En are obtained. According to the method, the utilization efficiency of the beam current can be greatly improved, the pollution and waste of the beam current are reduced, sinceactive variable energy is used and a degrader is not used, the beam current does not interact with the degrader, no nuclear fragments are generated and the spot size does not change with the thickness of the degrader, since the active variable energy can be achieved in a single cycle, the times of beam current injection, acceleration, and power supply zeroing can be omitted, the irradiation timecan be shortened, and the irradiation efficiency can be improved.

Description

technical field [0001] The invention relates to a single-period multi-step active variable energy slow extraction method of a synchrotron. With the method, multiple energy transformations can be realized in one pulse period, and multiple energy beams can be quickly provided to the terminal, which greatly saves radiation. Irradiation time, improve irradiation efficiency. Background technique [0002] Because the irradiation of heavy ion beams on organisms has the characteristics of inverted depth dose distribution, small side scatter, high relative biological effect and low oxygen increase ratio, etc., making heavy ion cancer treatment has become an advanced technology in the world today. Effective radiation therapy for cancer. The beam energy of the commonly used deep heavy ion therapy for cancer is 120MeV / u-400MeV / u (heavy ion). [0003] The equivalent Bragg peaks of heavy ion beams in water are related to beam energy, and different energies correspond to different depths...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/10
CPCA61N5/1077A61N2005/1087
Inventor 石健夏佳文李朋李桂花许哲闫怀海杨建成高大庆
Owner 惠州离子科学研究中心
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