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1.
在电子和离子光学理论(特别是象差理论)中,广泛地应用了矩阵的运算方法。本文讨论了旋转对称电子光学系统与重叠场(环形电场与非均匀磁场的叠加)离子光学系统中存在初级象差下的变换矩阵,证明了这些变换矩阵的行列式数值恒为1.这个普遍结论是刘维定理的具体应用。这对于电子和离子光学象差理论及计算机辅助设计具有一定意义。
关键词: 相似文献
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A. I. Boriskin V. M. Eremenko S. N. Mordyk O. R. Savin A. N. Skripchenko V. E. Storizhko S. N. Khomenko 《Technical Physics》2008,53(7):927-933
The ion-optical systems of a mass spectrometer with a laser ion source and coordinate-sensitive microelectronic detector are analyzed using the matrizant method. The dispersion properties of the mass spectrometer, as well as ion beam radial and axial focusings in its optimized ion-optical system, are determined, and first-and second-order angular and velocity aberrations of the image are corrected. The basic parameters and characteristics of a refined (according to calculation results) version of the laser mass spectrometer with a coordinate-sensitive microelectronic detector are presented. 相似文献
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It is suggested to study the ion-optical properties of sectorial electrostatic charged-particle analyzers with the matrizant technique. The matrizants can effectively be used in investigating beam dynamics in sectorial electrostatic fields with consideration for edge effects within rectangular and smooth field models. 相似文献
5.
S. F. Belykh A. D. Bekkerman A. B. Tolstogouzov A. A. Lozovan D. J. Fu 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2018,12(1):33-37
The principles of constructing a sputtering-type high-current source of homogeneous and heterogeneous cluster ions are comprehensively analyzed. The results of analysis are used to perform computer simulation of the given source. The ion-optical scheme and structural model of a new cluster ion source are developed. 相似文献
6.
Golikov Yu. K. Berdnikov A. S. Antonov A. S. Krasnova N. K. Solov’ev K. V. 《Technical Physics》2019,64(12):1850-1865
Technical Physics - Electrostatic turning devices are electron- and ion-optical elements changing the direction of movement of a parallel monochromatic beam of charged particles by a given angle... 相似文献
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Averin I. A. Berdnikov A. S. Masyukevich S. V. Samsonova N. S. Gall’ N. R. Gall’ L. N. 《Technical Physics》2019,64(4):564-568
Technical Physics - Ways to reduce ion beam intensity losses in a mass spectrometric ion source, which are caused by chromatic aberration of its immersion ion-optical system, are considered. These... 相似文献
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Technical Physics - Phase-space diagrams are proposed to be used to determine the quality of focusing of charged particles in ion-optical devices. Phase-space diagrams with nonlinear contours are... 相似文献
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An ion-optical scheme for a portable magnetic double-focusing mass spectrometer that makes it possible to analyze several components simultaneously over a wide mass range (the mass-spectrograph operating mode) is proposed. This scheme effectively solves the research and technological problems involving the analysis of rapidly varying compositions. 相似文献
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The concept of pseudopotential is used to study the ion trajectories in a superposition of uniform static and linear high-frequency electric fields. An ion-optical system is developed to generate a combination of electric fields with different spatial and temporal distributions of potentials. It is demonstrated that such systems can be used as ion traps with spatial confinement in a single quadrant or half plane in the Fouriertransform mass-spectrometers. 相似文献
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An electrostatic ion-optical system providing angular focusing of the beam and its monochromatization at the entrance to a monopole mass spectrometer is suggested and analyzed. The system uses a funnelshaped extracting electrode and a cylindrical energy filter with a flat electrode in its meridional plane. The geometry of the system and the supply voltage can be varied in proportion to the aperture radius and anode potential, respectively. 相似文献
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V. T. Kogan S. A. Manninen D. S. Lebedev O. S. Viktorova I. T. Amanbaev 《Technical Physics》2005,50(6):794-798
An ion-optical scheme that allows for a considerable improvement of the sensitivity and speed of a mass spectrograph is suggested.
These ends are accomplished by appropriately choosing the parameters of an electrostatic capacitor and the shape and location
of a magnetic lens, as well as by using an original multichannel linear sectional detector. The numerical simulation of the
detector is carried out. It is shown that rapid analysis of multicomponent mixtures in a wide mass range, along with a substantial
extension of the dynamic range of a signal recorded, is a possibility. The basic parameters of a mass analyzer based on the
scheme suggested are verified experimentally, and the results obtained are discussed. 相似文献
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K. -H. Schmidt T. Brohm H. -G. Clerc M. Dornik M. Fauerbach H. Geissel A. Grewe E. Hanelt A. Junghans A. Magel W. Morawek G. Münzenberg F. Nickel M. Pfützner C. Scheidenberger K. Sümmerer D. Vieira B. Voss C. Ziegler 《Physics letters. [Part B]》1993,300(4):313-316
Cross sections of iridium and platinum isotopes have been measured, which were produced as fragments from 197Au projectiles interacting with aluminum target nuclei at 1 A GeV. The fragments were identified by a kinematic analysis (ΔE−Bρ-time-of-flight) and by an ion-optical separation at the projectile-fragment separator FRS at GSI. Indications are found for high excitation energies and weak proton-neutron correlations in the peripheral nuclear-collision process. 相似文献
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C. Brandau D. Boutin H. Geissel J. Gerl M. Górska S. Manikonda G. Münzenberg Zs. Podolyák C. Scheidenberger H. Weick M. Winkler M. Yavor 《The European physical journal. Special topics》2007,150(1):225-226
An ion-optical study on the layout of the so-called
energy-buncher stage in the low-energy branch of the planned
fragment separator Super-FRS is presented. The main purpose of the
energy-buncher is a significant reduction of the energy spread of
the `hot' fragments at the exit of the separator. Alternatively,
the central unit of the buncher—a large dispersive dipole
system—can be used as a high-resolution spectrometer for
secondary products of nuclear reactions. The proposed design
provides a large degree of flexibility for different experimental
scenarios with slowed-down low-energy or stopped exotic isotopes. 相似文献
16.
高精度环形谱仪SRing作为HIAF装置的核心之一,是获取高品质放射性次级束,并将束流用于加速器技术研究、原子物理及核物理实验的关键设备。SRing有三种运行模式:等时性模式、正常模式与内靶模式。等时性模式下,SRing运行在特殊线性光学设置下,可以精确测量寿命低至几十微秒的原子核的质量。介绍SRing等时性模式的线性光学及高阶项校正的设计方案。在使用程序GICOSY进行等时性高阶项校正数值计算后,将得到的光学传输矩阵输入到程序MOCADI进行粒子跟踪模拟。以γt=1.43的等时性模式为例,SRing的动量接收度为±0.20%,粒子跟踪结果显示,在仅满足一阶等时性条件时SRing的质量分辨能力R=1.6×104。在保证动量接收度不变的前提下,考虑了等时性高阶项校正后SRing的质量分辨能力提高到R=1.2×106,达到设计要求。The Spectrometer Ring, as the most important experiment terminal of the High Intensity heavy-ion Accelerator Facility (HIAF) project, is a key device to obtain high-quality radioactive ion beams (RIBs) for atomic physics, nuclear physics experiments and accelerator technology researches. Three operation modes including the isochronous mode, the normal mode and the internal target mode, have been designed for the SRing. In the isochronous mode, the SRing operates under a special ion optics and could be used for precision mass measurement of short-lived nuclei with half-life shorter than several tens of microseconds. This study aims to design the ion optics for the isochronous mode and improve the mass resolving power of the SRing with higher-order ion-optical correction scheme for isochronism while preserve a large momentum acceptance of SRing. The ion optics and the higher-order correction for the isochronous mode are calculated with the code MAD-X and GICOSY respectively. Three ion optics with γt=1.43, 1.67, 1.83 settings have been calculated. The code MCOADI which utilizes the matrixes generated by the code GICOSY is used for particles tracking to verify the correction results. For the ion-optical setting of γt=1.43 with a momentum acceptance of ±0.20%, the mass resolving power of the SRing could be improved from R=1.6×104 to R=1.2×106, after isochronous higher-order corrections. 相似文献
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A source of negative hydrogen ions is constructed at the Institute for High Energy Physics in order to raise the intensity of the U-70 accelerator complex using multiturn charge-exchange injection. The 3D ion-optical IBSimu simulation package was used to model and optimize the system for extraction of an ion beam from plasma, its acceleration to 100 keV, and matching with a radio-frequency quadrupole (RFQ) accelerator. The system of extraction of an ion beam with a current of 50 mA and electron-flow suppression was modeled. The magnetic transport channels with two solenoids and six quadrupole lenses were compared. The end goals of analysis of the matching channel were to obtain the needed Twiss parameters and to minimize the emittance growth at the RFQ input. 相似文献
18.
The advantage of focused Xe+ beams over other rare gas species have been investigated [Zhukov, V.; Kalbitzer, S. Russ. Microelectron. 2011, 40 (1), 17–24]. In particular, the higher operation temperature of a super-tip gas field ion source for xenon ions is one outstanding technical feature. The properties of focused Xe+ beams are estimated with special reference to optimised ion-optical transport systems. Applications to both ion beam materials modification and ion beam materials analysis are outlined. 相似文献
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V. T. Kogan D. S. Lebedev Yu. V. Chichagov I. V. Viktorov I. T. Amanbaev S. A. Vlasov 《Technical Physics》2009,54(11):1714-1720
An ion source with electron ionization is considered. The charged-particle flow at the exit from this source has a cross section
of ∼0.1 × 0.1 mm, an angle spread of 2° × 2°, a relative energy spread of <0.5%, and an energy range of 0.5–3.0 keV. This
ion source is intended for systems where an ion beam is focused in two mutually perpendicular directions. The ion source design
makes it possible to ionize a sample locally (in a volume of ∼10 mm3), where the concentration of the particles under study exceeds the concentration averaged over the volume of the vacuum chamber
of the mass spectrometer by two to three orders of magnitude. The ion-optical properties of the source are numerically simulated,
and the optimum parameters of the source are chosen. Examples of the application of the ion source are given for the mass-spectrometric
determination of metal salts in aqueous solutions and of gases and volatile compounds in samples in various phase states. 相似文献
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S. N. Abramovich V. N. Zavjalov A. G. Zvenigorodsky I. G. Ignat’ev D. V. Magilin K. I. Melnik A. G. Ponomarev 《Technical Physics》2005,50(2):146-151
The probe-forming system of a nuclear scanning microprobe based on the parametric multiplets of quadrupole lenses is optimized.
The optimization is aimed at creating an ion probe with energy of several MeV that produces a micrometer spot on the target
at a current of ∼100 pA. The influence of different geometric and physical parameters on the ion-optical properties of the
probe-forming systems considered is determined. The optimization is carried out by varying the parameters specifying a given
parametric multiplet, and its efficiency is found from a quality criterion that takes into account the beam current for given
sizes of the spot and target. The beam parameters at the entrance to and at the exit from the éGP-10 electrostatic tandem
accelerator (produced by the VNIIéF) are involved in the optimizing calculations. These are the maximal energy, normalized
brightness, transport conditions, and chromatic inhomogeneity of the beam (i.e., the energy straggling of beam particles).
Allowance is also made for the parasitic components of the magnetic quadrupole lens field, which arise because of quadrupole
symmetry breaking by technological and physical reasons. 相似文献