摘要:
An apparatus may include a resonator chamber, arranged in a vacuum enclosure; an RF electrode assembly, arranged within the vacuum enclosure; and a resonator coil, disposed within the resonator chamber, the resonator coil having a high voltage end, directly connected to at least one RF electrode of the RF electrode assembly.
摘要:
For high-voltage devices such as particle accelerators, novel geometries for a triple-junction at which an insulator, an anode and a vacuum meet are disclosed. A singularity in the electric field at the triple-junction is eliminated, reducing dielectric flashover and allowing the devices to operate at higher voltages without breakdown. In one aspect, such a device includes a cathode, an anode having an anode surface exposed to a vacuum, and a dielectric body disposed between the cathode and anode, the dielectric body having a dielectric surface that is exposed to the vacuum, wherein the dielectric surface and the anode surface approach each other such that an angle measured across the vacuum between the dielectric surface and the anode surface decreases with decreasing distance between the dielectric surface and the anode surface until the dielectric surface and the anode surface meet and are parallel.
摘要:
An RF cavity includes a chamber, a conductive wall that encloses the chamber and has an inner side and an outer side, a switch arrangement comprising a plurality of solid-state switches arranged along a circumference of the wall around the chamber, wherein the solid-state switches are connected to the conductive wall such that RF currents are induced in the conductive wall when the switch arrangement is activated, as a result of which RF power is coupled into the chamber of the RF cavity, and a shielding device located on the outer side of the conductive wall, along a circumference of the RF cavity, the shielding device configured to increase the impedance of a propagation path of RF currents along the outer side of the wall such that the RF currents coupled into the wall are suppressed on the outer side of the wall.
摘要:
An RF apparatus may include: an RF resonance device having an electrically conductive outer wall, the outer wall comprising a gap extending over its circumference, and an input coupling device having an RF generator, arranged on the outer side of the outer wall of the RF resonance device in the region of the gap, for coupling RF radiation of a particular frequency through the gap into the interior of the RF resonance device, and shielding which externally shields the generator and electrically bridges the gap on the outer side of the outer wall, wherein the shielding is formed as a resonator having a high impedance at the generator frequency
摘要:
The present invention relates to a dual-frequency resonant cavity (6) for cyclotron which includes a dee (10), a pillar (20), and a conducting enclosure (40) surrounding the pillar and the dee, an end of the pillar being connected to the base of the conducting enclosure and an opposite end of the pillar (20) supporting the dee (10). The conducting enclosure and the pillar form a transmission line comprising at least three portions (20a, 20b, 20c), each portion having a characteristic impedance (Zc1, Zc2, Zc3). The characteristic impedance Zc2 of the intermediate portion (20b) is substantially lower than the characteristic impedances Zc1 et Zc3 of the two other portions (20a, 20b), which makes it possible to have the cavity resonate according to two modes in order to produce two distinct frequencies, without having to make use of moving components such as for example sliding short-circuits or mobile plates.The present invention also relates to a method for designing such a resonant cavity, based on the use of electromagnetic—and radio frequency simulation tools.
摘要翻译:本发明涉及一种用于回旋加速器的双频共振腔(6),其包括一个dee(10),一个柱(20)和围绕柱和dee的导电罩(40),柱的一端是 连接到导电外壳的基部和支撑趾部(10)的支柱(20)的相对端。 导电封壳和柱形成包括至少三个部分(20a,20b,20c)的传输线,每个部分具有特征阻抗(Zc1,Zc2,Zc3)。 中间部分(20b)的特征阻抗Zc2基本上低于两个其它部分(20a,20b)的特征阻抗Zc1 et Zc3,这使得可以根据两种模式使腔谐振,以便产生两个 不同的频率,而不必使用移动部件,例如滑动短路或移动板。 本发明还涉及一种基于电磁和射频仿真工具的使用来设计这种谐振腔的方法。
摘要:
Electron accelerator of the re-circulating type, having a resonant coaxial cavity presenting an outer cylindrical conductor of axis A and a coaxial inner cylindrical conductor, an electron gun for injecting electrons into the cavity following a radial direction and into a median plane of the cavity, an RF system capable of accelerating the injected electrons following a trajectory into the median plane which has the shape of a flower centered on the axis A, deflecting magnets disposed into the median plane externally to the cavity for redirecting electrons back towards the axis A. The RF system includes final power amplifiers, each amplifier being directly coupled to the cavity through its own individual inductive loop and each two of these loops being physically spaced apart from each other by an angle alpha, such that alpha is not an integer multiple of 90 degrees.
摘要:
An apparatus for producing an annular electron beam comprises a cathode for generating electrons, a cavity having an annular shape and operable to receive the electrons, an energy input coupled to the cavity, where the energy input is operable to supply Radio Frequency (RF) energy at the cavity and an energy output coupled to the cavity and operable to receive accelerated electrons from the cavity and operable to output the accelerated electrons as an annular electron beam.
摘要:
The invention relates to a method for designing a radio-frequency cavity, in particular to be used in a cyclotron, radio-frequency cavity (2) comprising a conductive enclosure or “liner” (3) connected by at least two essentially inductive elements or “stems” (4) to a capacitive electrode (2′), the method being characterised in that it comprises the following subsequent steps: A. subdividing the volume of said radio-frequency cavity (2) in a number of sub-cavities (10,20,30) corresponding to at least two stems (4), each sub-cavity comprising a respective (stem4); B. imposing a condition of magnetic orthonormality on the separation surfaces between said at least two sub-cavities (10,20,30); C. independently for each of said at least two sub-cavities (10,20,30), calculating the size and/or the position of the respective stem (4) with respect to the physical conditions at the boundaries. The invention further relates to a radio-frequency cavity realised using the method according to the invention, and a cyclotron using such a cavity.
摘要:
Fabrication methods for contoured polyhedral cavities for particle acceleration are disclosed. The process may include: trimming flat sheets to a conformal shape; bending the sheets to form a contour that is axially curved and azimuthally flat; and joining the sheets to form a circumferentially polyhedral cavity that is configured to support a resonant electromagnetic field at cryogenic temperatures. The resulting cavity may have ductile or even brittle superconducting materials with an axially-oriented grain structure at each point on the circumference of the cavity. As part of the assembly process, the sheets may be bonded to a supporting substrate of thermally conductive material having integrated cooling passages. The supporting substrates may be configured to have electrical contact near the cavity openings while having a small gap near the equators of the cavity. Moreover, mode-coupling channels and waveguides may be provided to extract energy from undesired deflection modes.
摘要:
A method of fabricating a spherical cavitation chamber is provided. Depending upon the chamber's composition and wall thickness, chambers fabricated with the disclosed techniques can be used with either low or high pressure systems. During chamber fabrication, initially two spherical half portions are fabricated and then the two half portions are joined together to form the desired cavitation chamber. During the fabrication of each chamber half, the interior spherical surface is completed first and then the outer spherical surface. Prior to joining the two spherical cavitation chamber halves, the surfaces to be mated are finished, preferably to a surface flatness of at least ±0.01 inches. Electron beam welding is used to join the chamber halves together. Preferably the electron beam welding operation is performed under vacuum conditions. During electron beam welding, the two chamber halves are aligned and held together while the electron beam forms a weld along the chamber seam.