202 results about "Ion acceleration" patented technology

The ion acceleration system or complex (T) for medical and/or other applications is composed in essence by an ion source (1), a pre-accelerator (3) and one or more linear accelerators or linacs (6, 8, 10, 13), at least one of which is mounted on a rotating mechanical gantry-like structure (17). The isocentrical gantry (17) is equipped with a beam delivery system, which can be either ‘active’ or ‘passive’, for medical and/or other applications. The ion source (1) and the pre-accelerator (3) can be either installed on the floor, which is connected with the gantry basement, or mounted, fully or partially, on the rotating mechanical structure (17). The output beam can vary in energy and intensity pulse-by-pulse by adjusting the radio-frequency field in the accelerating modules of the linac(s) and the beam parameters at the input of the linear accelerators.

In an ion implantation system including (a) an ion source (b) a mass analyzing portion, (c) an ion acceleration portion, (d) an ion beam focusing/deflecting portion, and (e) an end station chamber for implanting ions onto a semiconductor substrate. The ion source consists of plural ion sources being connected to the same mass analyzing portion in which any one of the plural ion sources is selected. Mass-separated ions from the ion source are led to the acceleration portion, and a stencil mask is arranged approximately to the semiconductor substrate in the end station chamber.

Disclosed is a high-frequency discharge plasma generation-based two-stage Hall-effect plasma accelerator, which comprises an annular acceleration channel having a gas inlet port, a high-frequency wave supply section, an anode, a cathode, a neutralizing electron generation portion and a magnetic-field generation means, wherein: gas introduced from the gas inlet port into the annular acceleration channel is ionized by a high-frequency wave supplied from the high-frequency wave supply section, to generate plasma; a positive ion includes in the generated plasma is accelerated by an acceleration voltage applied between the anode and cathode, and ejected outside; and an electron included in the generated plasma is restricted in its movement in the axial direction of the annular acceleration channel by an interaction with a magnetic field. The two-stage Hall-effect plasma accelerator is designed to control a degree of ion acceleration in accordance with the acceleration voltage serving as an acceleration control parameter, and control an amount of plasma generation in accordance with the high-frequency wave output serving as a plasma-generation control parameter. The two-stage Hall-effect plasma accelerator of the present invention can control the ion acceleration and the plasma generation in a highly independent manner.

The invention discloses a three-level acceleration type spiral plasma propulsion device. The three-level acceleration type spiral wave plasma propulsion device is characterized in that an antenna is connected with an RF (Radio Frequency) power source, the antenna and a discharge chamber are fixedly arranged in a sleeve, and an electromagnetic coil is fixedly arranged on the outer circumferential surface of the sleeve in a surrounding way; the rear part of the discharge chamber is provided with a rotating electric field ion acceleration system, and the rotating electric field ion acceleration system comprises four graphite electrodes which are uniformly and symmetrically arranged on the outer circumferential surface of the sleeve; the tail end of the rotating electric field ion acceleration system is provided with an electromagnetic spray pipe ion acceleration system, and the electromagnetic spray pipe ion acceleration system comprises a conical expanding spray pipe of which one end is connected with the tail part of the discharge chamber, and the electromagnetic coil. According to the three-level acceleration type spiral plasma propulsion device disclosed by the invention, the rotating electric field acceleration system is adopted for carrying out secondary acceleration on a plasma, acceleration is further carried out through the electromagnetic spray pipe, and a three-level acceleration effect is formed, thus the thrust is generated by efficiently accelerating ions, the work of a propulsor under high power can be realized, the reliable performance of high ion ejecting speed and high propulsion capacity can be realized, wide application prospect is obtained, and a high-performance power platform can be provided for future space technology development.

A mass spectrum unit of accelerator consists of ion source, beam buncher, RFQ accelerator, electronic stripper, high energy analyzing system and detector. It is featured as connecting said unit and system in sequence; accelerating 14C, 12 C and 13C ion separately to be at certain energy for carrying out electronic lift off by R is not equal toQ accelerator in order to eliminate disturbance of molecular ion.

The invention relates to a mass spectrum analyzer, in particular to a mass spectrum VUV (Vacuum Ultraviolet) photoionization source device for in-source collision induced dissociation, which comprises a sample injecting capillary tube, an ion repelling electrode, an ion accelerating electrode, a vacuum ultraviolet lamp, a side pumping valve and an ionization source cavity, wherein the ion repelling electrode and the ion accelerating electrode are placed in the ionization source cavity at interval in parallel, the sample injecting capillary tube passes through the outer wall of the ionization source cavity, and one end of the sample injecting capillary tube is arranged in a central small hole of the ion repelling electrodes; a light emitting window of the vacuum ultraviolet lamp is placed opposite to a gap between the ion repelling electrode and the ion accelerating electrode; and an air outlet is arranged on the side wall of the ionization source cavity, and the side pumping valve is connected with the air outlet through a pipeline. The mass spectrum VUV photoionization source device can be used together with any types of quality analyzers, can simultaneously obtain the molecular weight and the structural information of a matter to be analyzed and also be used for rapidly distinguishing isomerides by utilizing in-source collision induced dissociation.

A system (12) is proposed for the acceleration of ions to treat Atrial Fibrillation (AF), arteriovenous malformations (AVMS) and focal epileptic lesions; this system (12) includes a pulsed ion source (1), a pre-accelerator (3) and one or more linear accelerators or linacs (5, 6, 7) operating at frequencies above 1 GHz with a repetition rate between 1 Hz and 500 Hz. The particle beam coming out of the complex (12) can vary (i) in intensity, (ii) in deposition depth and (iii) transversally with respect to the central beam direction. The possibility of adjusting in a few milliseconds and in three orthogonal directions, the location of each energy deposition in the body of the patient makes that system of accelerators (12) perfectly suited to irradiation of a beating heart.

Magnetically shielded miniature Hall thrusters are disclosed that use a unique magnetic field topology that prevents the magnetic field lines from intersecting the discharge channel walls in the acceleration region of the thruster. Instead, the lines of force originating from both the inner and outer pole pieces curve around the downstream edges of the discharge channel and follow the channel walls towards the anode. This unique field topology results in low electron temperature at the discharge channel walls while eliminating strong electric field components that would otherwise lead to high erosion rates and power deposition from ion acceleration into the channel walls.

A system for ion acceleration for medical purposes includes a conventional or superconducting cyclotron, a radiofrequency linear accelerator (Linac), a Medium Energy Beam Transport line (MEBT) connected, at the low energy side, to the exit of the cyclotron, and at the other side, to the entrance of the linear radiofrequency accelerator, as well as a High Energy Beam Transport line (HEBT) connected at high energy side to the radiofrequency linear accelerator exit and at the other end, to a system for the dose distribution to the patient. The high operation frequency of the Linac allows for reduced consumption and a remarkable compactness facilitating its installation in hospital structures. The use of a modular LINAC allows varying in active way the energy and the current of the therapeutic beam, having a small emittance and a time structure adapted to the dose distribution based on the technique known as the “spot scanning”.

A tandem mass spectrometer is provided in the present invention. The mass spectrometer includes an ion source, a quadrupole mass filter located at downstream side of the ion source, a linear ion trap disposed at downstream side of the mass filter and an ion detector placed on the side of the ion trap, all of which are placed in a vacuum environment. The instrument can obtain MS meeting the standard spectral library search criteria by the quadrupole mass filter cooperating with linear ion trap, realize any multi-stage MS under two modes of axial collision and resonance excitation, and predict and optimize the inflow amount and types of samples under the ion trap analysis mode by the quadrupole. A tandem MS analysis method is also provided, which can repeatedly provide precursor ion selection, ion acceleration, achieve high-energy collision dissociation, low product ion mass discrimination effect.

A shift of mass axis that occurs when the temperature of a vacuum container consisting of a vacuum chamber (15) and IT block (16) or that of a TOF power unit (20) for applying an ion acceleration voltage is changed, is respectively measured beforehand, and parameters expressing a transfer function based on its response are stored in a transfer function memory (24). During an analysis, a mass shift predicting operation section (25) estimates the current shift length of the mass axis from the current temperatures of the IT block (16) and TOF power unit (20) obtained by first and second temperature sensors (34 and 35) as well as from the two transfer functions stored in the memory (24). A mass shift correcting section (29) corrects the mass axis of the mass spectrum according to the estimated shift length. Thus, if the ambient temperature suddenly changes, the shift of the mass axis of the mass spectrum due to the temperature change is corrected with high accuracy, so that a mass spectrum with a high level of mass accuracy can be created.

A time-of-flight mass spectrometer includes a sample plate that supports a sample for analysis. A pulsed ion source generates a pulse of ions from the sample positioned on the sample plate. An ion accelerator receives the pulse of ions generated by the pulsed ion source and accelerates the ions. An ion detector includes an input in a flight path of the accelerated ions emerging from the field-free drift space and an output that is electrically connected to the sample plate. The ion detector converts the detected ions into a pulse of electrons.

An ion source includes a chamber. The ion source further includes a first hollow cathode having a first hollow cathode cavity and a first plasma exit orifice and a second hollow cathode having a second hollow cathode cavity and a second plasma exit orifice. The first and second hollow cathodes are disposed adjacently in the chamber. The ion source further includes a first ion accelerator between and in communication with the first plasma exit orifice and the chamber. The first ion accelerator forms a first ion acceleration cavity. The ion source further includes a second ion accelerator between and in communication with the second plasma orifice and the chamber. The second ion accelerator forms a second ion acceleration cavity. The first hollow cathode and the second hollow cathode are configured to alternatively function as electrode and counter-electrode to generate a plasma. Each of the first ion acceleration cavity and the second ion acceleration cavity are sufficient to enable the extraction and acceleration of ions.

The invention relates to the technical field of ion acceleration equipment, in particular to a mixed ion acceleration device. The device comprises a cavity, a radio frequency quadrupole field and a drift tube are arranged on the same center line in the cavity, a foundation plate is correspondingly arranged on the joint of the radio frequency quadrupole field and the drift tube, two T-shaped plates are symmetrically arranged in the cavity in an up-down mode, the two ends of the cavity are provided with end plates, the radio frequency quadrupole field comprises two bar type electrodes, the two adjacent bar type electrodes are installed on the T-shaped plates through an electrode support and an electrode support supporting rod, and electrode supporting contact parts are arranged between the electrode support and the bar type electrodes. The drift tube is of a multi-segment structure, each segment of drift tube is installed on the corresponding T-shaped plate through a drift tube supporting rod, the gap between every two adjacent drift tubes is of an interactive phase bunching structure, and the drift tube supporting rods are designed in an interdigitated H type. By means of the device, a lot of space and cost are saved, and the device is more economical and practical and has high transmission efficiency, high gradient acceleration ability and high power acceleration efficiency.

The invention relates to time-of-flight mass spectrometers which operate with pulsed ionization of superficially adsorbed analyte substances and with an improvement in the mass resolution by means of a time-delayed start of the ion acceleration; in particular with ion-accelerating voltages which change over time after a delayed start in order to obtain a constant mass resolution over broad mass ranges. Since the varying acceleration produces a broadening of the ion beam at right angles to the direction of flight, and this broadening increases with the ion mass, the invention proposes to compensate, to the desired extent, for the broadening of the ion beam with the aid of an additional ion-optical lens whose voltage is also varied over time. The invention also relates to measurement methods therefor.

The invention relates to the technical field of frequency control over high-frequency cavities of ion acceleration devices, in particular to an automatic frequency tuning control system, which comprises a drift tube high-frequency resonant cavity, wherein preset tuners are inserted into the cavity; a sampling ring arranged in the cavity is connected with an oscilloscope for displaying a voltage signal sampled from the cavity through a sampling line; driving motors are arranged on the tuners, and are connected with a control computer through a control line; the tuners are connected with the cavity through flanges; the control computer is used for determining a frequency difference between the design frequency of the cavity and the actual frequency of the cavity to control the driving motor to work through a voltage-to-frequency conversion algorithm. The automatic frequency tuning control system is applied to any high-frequency device required to work at stable frequency or any high-frequency system consisting of a plurality of high-frequency cavities, and can be used for remotely, rapidly and automatically tuning the frequency of the cavity or stabilizing the frequency of the cavity within a certain amplitude.

The present disclosure provides a method of manufacturing film member for laser-driven ion acceleration, a film target, and a method of manufacturing the same, so that only the film member exists at a laser focusing point on the film target, allowing repeated ion acceleration from the film member by focusing high power laser beams thereon. The method includes preparing a film member solution containing a film material to be used for laser-driven ion acceleration; forming a film member on a base substrate by using the film member solution; and separating the film member from the base substrate by dipping the base substrate having the film member formed thereon into a film parting solvent.

It is an object of the present invention to provide an accelerator that can accelerate by itself all ions up to any energy level allowed by the magnetic fields for beam guiding, and provides an all-ion accelerator in which with trigger timing and a charging time of an induced voltage applied to an ion beam injected from a preinjector by induction cells for confinement and acceleration used in an induction synchrotron, digital signal processors for confinement and acceleration and pattern generators for confinement and acceleration generate gate signal patterns for confinement and acceleration on the basis of a passage signal of the ion beam and an induced voltage signal for indicating the value of the induced voltage applied to the ion beam, and intelligent control devices for confinement and acceleration perform feedback control of on/off of the induction cells for confinement and acceleration.

The main voltage generator (5) applies a rectangular-wave radio-frequency voltage to the ring electrode (21) in order to capture ions inside the ion trap (2). In the case where the TOFMS (3) is operated in the reflectron mode, the radio-frequency voltage is changed into a constant voltage value when the phase thereof is 1.5π, and a voltage for expelling ions is applied to the end cap electrodes (22, 23) to expel the ions from the exit aperture (25) and introduce them into the TOFMS (3). In this case, since the velocity spread of the ions inside the ion trap (2) is small and so is the spatial spread thereof, a high mass resolution and accuracy can be achieved while assuring a high detection sensitivity. In the case where the TOFMS (3) is operated in the linear mode, the radio-frequency voltage is changed into a constant voltage value when the phase thereof is 0.5π, and then the ions are expelled. In this case, a high mass resolution and mass accuracy can be achieved since the variation of the ions' acceleration, which cannot be converged in the linear mode, can be suppressed.