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1.
We present a new concept for a Penning trap, which is
planar and allows for the implementation of novel confinement
techniques. The trap provides confinement perpendicular to its plane
by an electric potential minimum while a superimposed magnetic
field provides radial confinement. Both the axial position and the depth of the potential minimum
can be controlled by the applied voltages. The device is scalable in the
sense that an arbitrary number of planar traps can be embedded in
one plane thus representing a multitrap array which can be used
for particle interaction studies. Switches between
different traps in the planar array allow for controlled interactions
between the single stored particles. 相似文献
2.
A Penning trap consisting of concentric ring electrodes on a substrate and a magnetic field perpendicular to the substrate
plane has been loaded with electrons. In order to demonstrate the performance of the trap we have measured the motional frequencies
of the trapped electrons. Frequencies, line shape and width agree well with simulations. Miniaturization of the device is
at hand which opens novel possibilities for application in quantum computing.
Contribution presented at the TCP06, Vancouver Island, 2006-09-21 相似文献
3.
Stability of a charged particle in a combined Penning-Ioffe trap 总被引:1,自引:0,他引:1
The axial symmetry of a familiar Penning trap is broken by adding the radial magnetic field of an Ioffe trap. Despite the resulting loss of a confinement theorem, stable orbits related to adiabatic invariants are identified, expressions are given for their frequencies, and resonances that must be avoided are characterized. It seems feasible to experimentally realize the new Penning-Ioffe trap to test these theoretical predictions. It also may be possible to simultaneously confine cold positrons and antiprotons in a Penning-Ioffe trap, along with any cold antihydrogen they may form. 相似文献
4.
David von Lindenfels Manuel Vogel Wolfgang Quint Gerhard Birkl Marco Wiesel 《Hyperfine Interactions》2014,227(1-3):197-207
We have conceived, built and operated a ’half-open’ cylindrical Penning trap for the confinement and laser spectroscopy of highly charged ions. This trap allows fluorescence detection employing a solid angle which is about one order of magnitude larger than in conventional cylindrical Penning traps. At the same time, the desired electrostatic and magnetostatic properties of a closed-endcap cylindrical Penning trap are preserved in this configuration. We give a detailed account on the design and confinement properties, a characterization of the trap and show first results of light collection with in-trap produced highly charged ions. 相似文献
5.
基于捕获的新型正电子束及应用 总被引:1,自引:1,他引:0
基于捕获的新型正电子束技术是通过潘宁阱中捕获、约束和积累正电子而发展的新一代正电子束技术。本文介绍正电子的捕获、冷却,压缩技术,基于捕获的正电子束形成技术,以及该技术将来发展展望,最后讨论该技术在原子物理学和材料科学等多个领域的应用。 相似文献
6.
The excitation of the motion of ions in a Penning trap at twice their cyclotron frequency, 2ν
c
, by means of an azimuthal octupolar RF field has been studied with the LEBIT facility at the NSCL. The possibility of such
an RF octupolar excitation has been verified. Compared to ion excitation at ν
c
by means of quadrupolar fields an increased resolving power is observed in the cyclotron resonance curves, which may have
important implications for Penning trap mass measurements. Numerical simulations have been used to characterize important
properties of this type of excitation in detail and to predict the behavior of the ion motion under realistic conditions.
Good agreement with the experimental results is observed.
相似文献
7.
三维拉曼边带冷却后的铯原子样品装载于一个磁悬浮的大体积交叉光学偶极阱中, 继续加载一个小体积的光学偶极阱后, 实现了Dimple光学偶极阱对铯原子的高效装载. 对不同磁场下磁悬浮大体积光阱的有效装载势能进行理论分析与实验测量, 得出最优化的梯度磁场和均匀偏置磁场, 获得了基于磁悬浮大体积光阱的Dimple光学偶极阱的装载势能曲线, 实现了Dimple光学偶极阱对经拉曼边带冷却后俘获在磁悬浮的大体积光阱中的铯原子样品的有效装载. 比较了Dimple光学偶极阱分别从拉曼边带冷却、大体积的交叉光阱和消除反俘获势后的磁悬浮大体积光阱装载的结果, 将俘获在磁悬浮大体积光阱中的铯原子样品装载到Dimple光学偶极阱, 铯原子样品的密度提高了约15倍. 相似文献
8.
T. Mohamed 《Physics letters. A》2018,382(35):2459-2463
We studied radial compression features of electron plasmas in a Penning trap (an assembly of multi-ring electrodes (MRE) housed in a uniform magnetic field) using the rotating wall technique. The magnetic field was 5 T, and the MRE provide a long harmonic potential along the magnetic field axis. The compression features of the plasma were studied by varying the applied rotating electric field frequency, rotating electric field amplitude, compression time, as well as, the magnetic field strength in the Penning trap. The highest density achieved was cm?3 and the compressed plasma shows slow expansion after the compression, with an expansion rate of s?1. 相似文献
9.
We report the first demonstration of the axialization of laser cooled ions in a Penning trap. Axialization involves the application of a small radial quadrupole drive which couples the cyclotron and magnetron motions. This enhances the laser cooling, allowing tighter confinement of the ions to the central axis of the trap than is otherwise possible. Using an intensified charge-coupled device (ICCD) camera we have imaged the axialization process for the first time. For a single ion, we recorded a large decrease of the magnetron amplitude corresponding to a reduction in ion temperature of approximately 2 orders of magnitude to an upper limit of order 10 mK. We have discovered dynamics specific to the laser cooled system which depend critically on the axial drive frequency and amplitude. 相似文献
10.
Cyclotron dynamics of neutral atoms in optical lattices with additional magnetic field and harmonic trap potential 下载免费PDF全文
《中国物理 B》2020,(1)
We analytically and numerically discuss the stability and dynamics of neutral atoms in a two-dimensional optical lattice subjected to an additional harmonic trap potential and artificial magnetic field. The harmonic trap potential plays a key role in modifying the equilibrium state properties of the system and stabilizing the cyclotron orbits of the condensate.Meanwhile, the presence of the harmonic trap potential and lattice potential results in rich cyclotron dynamics of the condensate. The coupling effects of lattice potential, artificial magnetic field, and harmonic trap potential lead to single periodic, multi-periodic or quasi-periodic cyclotron orbits of the condensate. So we can control the cyclotron dynamics of neutral atoms in optical lattice by manipulating the strength of harmonic confinement, artificial magnetic field, and initial conditions. Our results provide a direct theoretical evidence for the cyclotron dynamics of neutral atoms in optical lattices exposed to the artificial gauge magnetic field and harmonic trap potential. 相似文献
11.
S. Schwarz C. Bachelet M. Block G. Bollen D. Davies M. Facina C. M. Folden III C. Guénaut J. Huikari E. Kwan A. A. Kwiatkowski D. J. Morrissey G. Pang A. Prinke R. Ringle J. Savory P. Schury C. Sumithrarachchi T. Sun 《Hyperfine Interactions》2006,173(1-3):113-122
The low-energy beam and ion trap facility LEBIT at the NSCL at MSU has demonstrated that rare isotopes produced by fast-beam
fragmentation can be slowed down and prepared such that precision experiments with low-energy beams are possible. For this
purpose high-pressure gas-stopping is employed combined with advanced ion manipulation techniques. Penning trap mass measurements
on short-lived rare isotopes have been performed with a 9.4 T Penning trap mass spectrometer. Examples include 66As, which has a half-live of only 96 ms, and the super-allowed Fermi-emitter 38Ca, for which a mass accuracy of 8 ppb (280 eV) has been achieved. The high accuracy of this new mass value makes 38Ca a new candidate for the test of the conserved vector current hypothesis.
相似文献
12.
S. T. Surzhikov 《Technical Physics》2017,62(8):1177-1188
The drift–diffusion model of a Penning discharge in molecular hydrogen under pressures of about 1 Torr with regard to the external electric circuit has been proposed. A two-dimensional axially symmetric discharge geometry with a cylindrical anode and flat cathodes perpendicular to the symmetry axis has been investigated. An external magnetic field of about 0.1 T is applied in the axial direction. Using the developed drift–diffusion model, the electrodynamic structure of a Penning discharge in the pressure range of 0.5–5 Torr at a current source voltage of 200–500 V is numerically simulated. The evolution of the discharge electrodynamic structure upon pressure variations in zero magnetic field (the classical glow discharge mode) and in the axial magnetic field (Penning discharge) has been studied using numerical experiments. The theoretical predictions of the existence of an averaged electron and ion motion in a Penning discharge both in the axial and radial directions and in the azimuthal direction have been confirmed by the calculations. 相似文献
13.
14.
Robert S. Van Dyck Jr. Steven L. Zafonte Paul B. Schwinberg 《Hyperfine Interactions》2001,132(1-4):163-175
Based on the use of a single ion, isolated at the center of a cryogenically cooled Penning trap, an environment is produced
which makes this mass spectrometer remarkably free of systematic errors. The most notable developments in our quest for an
ultra-high accuracy instrument were (a) the compensation of the trapping potential, (b) the discovery that motional sidebands
could manipulate radial energies, (c) the use of multiply-charged ions that could improve signal-to-noise, and (d) the use
of an ultra-stable superconducting magnet/cryostat system with drift <0.010 ppb/h. The dominant systematic errors are associated
with radial electric fields caused by image charges in the trap electrodes and with the rf-electrical drive field used to
determine the harmonic axial resonance. To illustrate the potential of this improved spectrometer, the four-fold improved
measurement of the proton's mass and the eight-fold improved measurement of oxygen's atomic mass will be described.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
15.
The role of electrical fields due to the patch effect in a Penning trap used to measure the Earth's gravitational accelerationg on antiprotons is analyzed. Theg measurement method is based on the study of the gravity-induced shift of the center of the radial orbits of particles stored in a Penning trap having the magnetic field perpendicular to the direction of the force of gravity. The analysis of the radial motion shows that forces originating from patch effect electrical fields about ten times stronger than the force of gravity, still allow a differential measurement ofg for antiprotons and matter particles (H–). As the precision of the measurement is affected by the particle axial energy distribution, particular care must be devoted to injecting antiprotons and H– ions into the trap with very similar initial conditions. 相似文献
16.
利用有限元程序ANSYS,开展潘宁离子俘获装置的电场模拟计算。基于电场数据,结合Runge_Kutta_Fehlberg方法进行潘宁装置在多种模式下的离子俘获过程模拟工作,得到了准确的离子俘获结果。并对实际条件下具有偏离理想情况电极分布的俘获装置进行了优化计算及电场分析,同样实现了离子俘获过程的准确模拟。有限元方法用于离子俘获装置的电场计算以及后续离子俘获过程模拟流程的建立,为类似的电势阱离子俘获装置建造运行提供有效的技术支持。 相似文献
17.
The linear combined trap is a superposition of the conventional Paul and Penning traps in one device. Using a four-rod structure, a linear configuration can be constructed. Such a linear combined trap is particularly well suited for catching ions produced externally, since both the effective potential due to the driving RF-field and the DC-magnetic field contribute to the ion confinement. The use of this novel trap for on-line laser and mass-spectroscopy of rare short-lived isotopes is proposed. 相似文献
18.
Here we have investigated the influence of magnetic field and confinement potential on nonlinear optical property, third harmonic generation (THG) of a parabolically confinement quantum dot in the presence of Rashba spin orbit interaction. We have used density matrix formulation for obtaining optical properties within the effective mass approximation. The results are presented as a function of confining potential, magnetic field, Rashba spin orbit interaction strength and photon energy. Our results indicate that an increase of Rashba spin orbit interaction coefficient produces strong effect on the peak positions of THG. The role of confinement strength and spin orbit interaction strength as control parameters on THG have been demonstrated. 相似文献
19.
20.
M. Froese C. Champagne J. R. Crespo López-Urrutia S. Epp G. Gwinner A. Lapierre J. Pfister G. Sikler J. Ullrich J. Dilling 《Hyperfine Interactions》2006,173(1-3):85-92
The precision of atomic mass measurements in a Penning trap is directly proportional to the charge state q of the ion and,
hence, can be increased by using highly charged ions (HCI). For this reason, charge breeding with an electron beam ion trap
(EBIT) is employed at TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) on-line facility in Vancouver, Canada. By bombarding
the injected and trapped singly charged ions with an intense beam of electrons, the charge state of the ions is rapidly increased
inside the EBIT. To be compatible with the on-line requirements of short-lived isotopes, very high electron beam current densities
are needed. The TITAN EBIT includes a 6 Tesla superconducting magnet and is designed to have electron beam currents and energies
of up to 5 A and 60 keV, respectively. Once operational at full capacity, most species can be bred into a He-like configuration
within tens of ms. Subsequently, the HCI are extracted, pass a Wien filter to reduce isobaric contamination, are cooled, and
injected into a precision Penning trap for mass measurement. We will present the first results and current status of the TITAN
EBIT, which has recently been moved to TRIUMF after assembly and commissioning at the Max-Planck-Institute (MPI) for Nuclear
Physics in Heidelberg, Germany. 相似文献