48results about How to "Improve beam quality" patented technology

The invention discloses a proton therapy system based on a compact superconducting cyclotron. The proton therapy system includes a superconducting cyclotron system, an energy selection system and a beam transportation system, a fixed treatment room subsystem and a rotary frame treatment subsystem; the fixed energy proton beam led out by the superconducting cyclotron in the superconducting cyclotron system can be a continuously adjusting proton beam of 70-200MeV via the energy selection system, so that the longitudinal adjustment of the range during the proton therapy of tumors can be met; thebeam is transmitted to the fixed treatment room subsystem and the rotary frame treatment subsystem via the beam transportation system; the superconducting cyclotron system, the energy selection system, the beam transportation system and a treatment head are subjected to cooperative control to realize the transverse expansion of the proton beam, so that the intensity modulation treatment of the tumor can be completed. According to the invention, the innovation is good, the practicability is high, the beam intensity of the superconducting cyclotron is adjustable, and the intensity modulation treatment can be realized; and the system has an extremely important promotion effect on the accuracy, effectiveness and high efficiency of tumor treatment of a patient.

The invention relates to an ion acceleration apparatus and belongs to the nuclear energy technology field. A high-frequency electric-focusing high-gradient ion acceleration apparatus is mainly characterized in that the high-gradient ion acceleration apparatus comprises four mutually-vertical T-shaped plates arranged in a vacuum cavity cylinder, a plurality of drift tubes are fixedly connected between the two T-shaped plates respectively by drift-tube support bars, the plurality of drift tubes and the vacuum cavity cylinder are on a same central line, vertical high-frequency electric quadrupole lenses are oppositely mounted between the drift tubes and are fixedly connected between the vertical T-shaped plates, and horizontal high-frequency electric quadrupole lenses are oppositely mounted between the drift tubes and are fixedly connected with the two horizontal T-shaped plates. The advantages of the apparatus provided by the invention in acceleration of high-intensity ion beams, a structure is compact, so that beam quality is excellent; an acceleration function and a transverse and longitudinal focusing function are combined in the same high frequency structure, cavity shunt impedance is high and high-frequency power consumption is greatly reduced; and zero phase is utilized to accelerate, acceleration efficiency is relatively high, length of the cavity can be effectively reduced and effective acceleration gradient is raised. The ion acceleration apparatus provided by the invention is mainly used for acceleration of high-intensity low-energy ion beams and can be used for application-type acceleration apparatuses such as injectors of high-intensity accelerators, industrial accelerators and treatment apparatus injectors.

A wavelength converting device 1 has a ferroelectric layer 6 made of a ferroelectric material. The ferroelectric layer has a wavelength converting portion A having a ridge-type optical waveguide 7, additional portions A and B provided in both sides of the wavelength converting portions, respectively, and groove-forming portions C and D between the wavelength converting portion and the additional portions, respectively. The device further has a supporting body 2 adhered to a back face 6f of the ferroelectric layer 6, and back side metal films 5A and 5B covering at least a part of a back face 6f of the additional portions 6, respectively. The back side metal film 5A or 5B does not cover the back face 6f of the wavelength converting portion 6.

The invention discloses an independent tuning microwave electron gun with external cathode which is composed of an external negative pole, namely, dipolar gun, a microwave cavity, a tuning mechanism, a first cavity input waveguide, a second cavity input waveguide and a cooling water pipe; the external negative pole and the microwave cavity are connected by Kovar flange argon-arc welding, the tuning mechanism and the microwave cavity are connected by braze welding in a hydrogen furnace, the first cavity input waveguide and the second cavity input waveguide are connected with the microwave cavity by braze welding, but the first cavity input waveguide and the second cavity input waveguide are connected at different longitudinal positions of the microwave cavity with the angles being mutually perpendicular, and then connected with a waveguide transmission line fed with microwave power respectively. The invention is designed to solve manufacture technique, so that the electron gun has simple structure and electron beam is excellent in performance, thus providing a novel electron beam source device for compact type free electron laser and electron linear accelerator.

The invention discloses a semiconductor laser, comprising an optical waveguide structure, wherein the optical waveguide structure comprises a lower waveguide layer (2), a MQW (multiple quantum wells) active layer (3) and an upper waveguide layer (5), which are overlapped in sequence from bottom to top; a grating layer (4) is formed at the upper part of the MQW active layer (3); the upper waveguide layer (5), a wrapping layer 6 and a contact layer 7 form a ridge; the ridge is provided with an incident end face and an emergent end face and has a beam diffusion structure at the side of the emergent end face; the beam diffusion structure has a beam diffusion part which is of a shape gradually shrinking from the emergent end face to the inside; the horizontal divergence angle of the beam diffusion part is 5 DEG-20 DEG preferably. The semiconductor laser can restrain the light diffusion in the horizontal direction and improve the quality of a beam so that better mode matching between the beam and optical fibers can be achieved; the output power of the laser can be enhanced and the high-frequency response characteristic of the laser can be improved.

A single higher-harmonic ultraviolet monochromatic light source comprises a 800nm high-field polarization laser, a beam shaper, a light energy controller, an optical phase modulator, a converging lens, a long-range interaction gas box, a metallic aluminum film, a vacuum chamber and the like. The single higher-harmonic ultraviolet monochromatic light source can generate single higher harmonic waves. The highly-monochromatic high-coherence ultraviolet radiation can be applied to high-precision processing and detection of micronano structures, as well as to the fields of high-precision holographic coherent imaging and the like, thereby being wide in application.

The invention relates to a system for a cascade cyclotron and a dual-cooling storage ring, which comprises an ion source (500) and a cooling storage ring (300) with a symmetric magnetic focusing structure, wherein the injection end of the cooling storage ring (300) with the symmetric magnetic focusing structure is connected with a sector-focusing cyclotron (100) or/and a separated sector-focusing cyclotron (200) through a first ion beam transport line (600); and the leading-out end of the cooling storage ring (300) with the symmetric magnetic focusing structure is connected with a cooling storage ring (400) with an asymmetric magnetic focusing structure through a second ion beam transport line (700). The system uses the cascade combination of one or more cyclotrons and a synchrotron storage ring which is used for improving the quality of ion beam currents and is provided with an ion cooling technical device and simultaneously uses the cooling storage ring of the ion cooling technical device, meets high-precision nuclear physics experiments and atomic physics experiments effectively, and can be applied to application research projects such as material radiation, proton-heavy ion cancer treatment and the like.

The invention provides a neutron capture treatment system. The neutron capture treatment system comprises a neutron generation device and a beam shaping body, and further comprises a concrete wall which forms a space for accommodating the neutron generation device and the beam shaping body and shields radiation generated by the neutron generation device and the beam shaping body, wherein a supporting module is arranged in the concrete wall; the supporting module can support the beam shaping body and is used for adjusting the position of the beam shaping body; and the supporting module comprises concrete and a reinforcing part at least partially arranged in the concrete. According to the neutron capture treatment system, a locally adjustable support is designed for the beam shaping body, sothat the beam shaping body meets the precision requirement, the beam quality is improved, and the assembly tolerance of a target is met.

The invention relates to a plasma source for treatment equipment and an application method of the plasma source. The plasma source is characterized in that the plasma source comprises a gas cylinder,a flow control device, a microwave coupler, a discharge source body, a first vacuum chamber, a molecular pump and a mechanical pump. An outlet of the gas cylinder containing the working gas is connected with an inlet of the discharge source body through the flow control device via the microwave coupler. The microwave coupler is used for feeding microwaves emitted by the microwave system into the discharge source body, and the discharge source body is used for conducting microwave heating ionization on working gas to generate high-density plasma and leading out the high-density plasma to form an ion beam current used for being matched with treatment equipment. An outlet of the discharge source body is connected with an inlet of the first vacuum chamber, an outlet of the first vacuum chamberis connected with an inlet of the molecular pump, an outlet of the molecular pump is connected with an inlet of the mechanical pump, and an outlet of the mechanical pump is connected with the flow control device. The plasma source can be widely applied to proton treatment and neutron radiotherapy equipment.

The invention discloses a transverse time-of-flight cluster mass selector and a use method thereof, and adopts a pair of parallel plate electrodes to replace a complex structure consisting of three groups of electrodes, namely a cluster ion forward deflection region, a free flight region and a reverse deflection region, in an existing universal cluster time-of-flight mass selector, so that the structure of the selector is greatly simplified. A simple linear relation exists between the cluster mass selected by the selector and the acceleration and deceleration pulse voltage amplitude applied to the parallel plate electrode, so that the cluster mass can be selected by simply adjusting the pulse voltage amplitude, the selector is visual, simple and easy to debug and operate, the mass resolution is constant, and the calibration is rapid. By reasonably setting the time logic of the voltage pulse, the cluster mass selection can reach a high passing rate of 50%. In addition, the electric field distribution structure restrains the ions from converging towards the axis, and compared with the electric field distribution configuration, causing ion divergence, of the current universal cluster time-of-flight mass selector, the quality of the beam is better improved.

A xenon lamp pumping solid laser based on a refractive index highly-matched gain medium comprises a xenon lamp pumping system and a resonant cavity, the resonant cavity comprises an input mirror, an output mirror and an end face pumping gain medium, the gain medium is a gradient-doped transparent ceramic rod prepared by adopting a gel casting method, a core is made of YAG ceramic co-doped with Cr and Nd ions, the outer layer is made of YAG ceramics singly doped with any rare earth ions of Lu, Gd and Te, and the YAG ceramics are staggered one by one in an N + 1 mode; pump light output by the xenon lamp pump laser is converged by the laser converging device and then enters the input mirror, the transmitted pump light enters the gain medium from the end face, the gain medium generates laser through stimulated radiation, and the generated laser oscillates in the resonant cavity and is finally output from the output mirror. The gradient doped transparent ceramic is adopted, through doping and matching of rare earth ions with different concentrations, the theoretical transmittance is achieved, meanwhile, the heat effect problem caused by different refractive indexes is solved, the light beam quality is effectively improved, and mode regulation and control are achieved.

A wavelength-combined laser device (10) is provided with: a semiconductor laser which emits, from emitting end surfaces (1b) of a plurality of light-emitting parts arranged in the laser beam combination direction, a plurality of laser beams (6) in the optical axis direction perpendicular to the laser beam combination direction; a wavelength combining element (3) which combines the plurality of laser beams in the laser beam combination direction and emits the combined laser beams as a single laser beam; a cross-coupling suppression optical system (4) which has positive power in the laser beam combination direction perpendicular to the optical axis of the single laser beam output from the wavelength combining element; and a partial reflecting mirror (5) which reflects the single laser beam that has passed through the cross-coupling suppression optical system and transmits and outputs the laser beam, wherein, in the plane formed by the optical axis and the laser beam combination direction, the cross-coupling suppression optical system is disposed so that images of the emitting end surfaces are formed on the partial reflective mirror by connecting, in a conjugate manner, the emitting end surfaces and the partial reflective mirror.

The invention discloses a stripping extraction cyclotron single-circle beam extraction device which comprises two stripping target devices which are arranged on the radius of a cyclotron, have a difference of 180 degrees and can move a distance in the radial direction, the heads of the two stripping target devices are respectively provided with a stripping membrane for stripping and leading out aproton beam; a phase selector, arranged in a small-radius low-energy region of the cyclotron, and used for realizing phase selection of the accelerated negative hydrogen ion beam current. The two stripping target devices are arranged on the radius of the cyclotron, have an angle difference of 180 degrees and can move in the radial direction, and the phase selector is arranged in a small-radius low-energy area of the cyclotron and is used for realizing single-circle extraction of accelerator beams. According to the invention, single-circle extraction of one extraction channel is realized underthe condition of bidirectional extraction of beams of the cyclotron in a stripping extraction mode, so that relatively high extraction beam quality is obtained.

The invention discloses a negative hydrogen ion extraction device. The device comprises an electric field assembly and a first gate, a second gate and a third gate which are sequentially arranged in an insulated and spaced way. The first gate, the second gate and the third gate are provided with through holes along the overlapping direction of the three gates and along the same axis direction; thesecond gate is provided with an annular magnet surrounding the through hole of the second grid; the electric field assembly comprises a first voltage assembly loaded between the first gate and a plasma discharge chamber, a second voltage assembly loaded between the second gate and the first gate and a third voltage assembly loaded between the third gate and the second gate. The first voltage assembly, the second voltage assembly and the third voltage assembly enable the potentials of the plasma discharge chamber, the first gate, the second gate and the third gate to be sequentially increasedto form a multi-stage electric field. Negative hydrogen ions and electrons generated in the plasma discharge chamber are led out by adopting the multi-stage electric field, and electron constraints are filtered by utilizing the magnetic field so that the beam intensity of the obtained negative hydrogen ions is effectively improved, the beam purity is improved and the beam quality is improved.