Determination of Transverse Distributions of Ion Plasmas Confined in a Linear Paul Trap by Imaging Diagnostics

Ito, K.; Nakayama, Kenji; Ohtsubo, Shunsuke; Higaki, Hidehiko; Okamoto, Hiromi

doi:10.1143/jjap.47.8017

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…To provide an additional diagnostic and information of the transverse ion distribution, an MCP detector with phosphor screen is being installed. As the MCP gain is known to saturate for high ion number, an analysis method for correcting this and extracting ion number from the resulting images has been developed [10]. The MCP will be calibrated against ion signal from the faraday cup to determine ion number.…”

Section: Discussionmentioning

confidence: 99%

Commissioning and first results of the Intense Beam EXperiment (IBEX) linear Paul trap

Sheehy¹,

Carr²,

Martin³

et al. 2017

J. Phys.: Conf. Ser.

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A tandem linear Paul trap as an ion source K Izawa, H Higaki, H Yamate et al. Abstract. The Intense Beam Experiment (IBEX) is a linear Paul trap designed to replicate the dynamics of intense particle beams in accelerators. Similar to the S-POD apparatus at Hiroshima University, IBEX is a small scale experiment which has been constructed and recently commissioned at the STFC Rutherford Appleton Laboratory in the UK. The aim of the experiment is to support theoretical studies of next-generation high intensity proton and ion accelerators, complementing existing computer simulation approaches. Here we report on the status of commissioning and first results obtained.

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Section: Discussionmentioning

confidence: 99%

Commissioning and first results of the Intense Beam EXperiment (IBEX) linear Paul trap

Sheehy¹,

Carr²,

Martin³

et al. 2017

J. Phys.: Conf. Ser.

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“…27−29 Variations of the technique have been employed in the detection of Li + ion clouds to obtain radial ion velocity profiles, 30 in addition to the study of buffer-gas cooling effects on non-neutral plasmas (containing 10 7 ions) in linear Paul traps. 31 Advances in camera technology have recently enabled the simultaneous measurement of both the position and timing of ion signals, achieving exceptional time resolution while maintaining position sensitivity. The Timepix3 camera has a hybrid pixel readout chip capable of performing simultaneous time-of-arrival (ToA) and time-over-threshold (ToT) measurements with nanoscale temporal resolution.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The coupling of microchannel plates (MCPs) with a phosphor screen allows for the simultaneous recording of ion flight times and positions with the channel-specific electron cascade generated by the MCPs, inducing phosphorescence on the screen. When interfaced with a CCD camera, ion positions can be recorded as a function of timewith this approach widely used in velocity map imaging studies. − Variations of the technique have been employed in the detection of Li + ion clouds to obtain radial ion velocity profiles, in addition to the study of buffer-gas cooling effects on non-neutral plasmas (containing 10 7 ions) in linear Paul traps …”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals

Diprose,

Richardson,

Regan

et al. 2024

J. Phys. Chem. A

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Coulomb crystals have proven to be powerful and versatile tools for the study of ion−molecule reactions under cold and controlled conditions. Reactions in Coulomb crystals are typically monitored through a combination of in situ fluorescence imaging of the laser-cooled ions and destructive time-of-flight mass spectrometry measurements of the ejected ions. However, neither of these techniques is able to provide direct structural information on the positions of nonfluorescing "dark" ions within the crystal. In this work, structural information is obtained using a phosphor screen and a microchannel plate detector in conjunction with a Timepix3 camera. The Timepix3 camera simultaneously records the spatial and temporal distribution of all ions that strike the phosphor screen detector following crystal ejection at a selected reaction time. A direct comparison can be made between the observed Timepix3 ion distributions and the distributions established from SIMION simulations of the ion trajectories through the apparatus and onto the detector. Quantitative agreement is found between the measured Timepix3 signal and the properties of Coulomb crystals assigned using fluorescence imaging�independently confirming that the positions and numbers of nonfluorescing ions within Coulomb crystals can be accurately determined using molecular dynamics simulations. It is anticipated that the combination of high-resolution spatial and temporal data will facilitate new measurements of the ion properties within Coulomb crystals.

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“…The transverse dynamics of particles in the two systems are equivalent. 6,[9][10][11][12][13][19][20][21] The Paul Trap Simulator Experiment (PTSX) device 9 is a linear Paul trap and consists of three co-linear cylinders, as shown in Figure 1, with radius r w ¼ 0:1 m, each divided into four 90 azimuthal sectors, in a vacuum of 1 Â 10 À10 Torr. The pure cesium-ion collisionless plasma is confined radially in the central 2 m long cylinder by oscillating voltages (typically or dump the ions, the voltage on one or the other set of outer electrodes is switched to the same oscillating voltage that is applied to the central cylinder.…”

Section: Introductionmentioning

confidence: 99%

Excitation of transverse dipole and quadrupole modes in a pure ion plasma in a linear Paul trap to study collective processes in intense beams

Gilson¹,

Davidson²,

Efthimion³

et al. 2013

Physics of Plasmas

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Transverse dipole and quadrupole modes have been excited in a one-component cesium ion plasma trapped in the Paul Trap Simulator Experiment (PTSX) in order to characterize their properties and understand the effect of their excitation on equivalent long-distance beam propagation. The PTSX device is a compact laboratory Paul trap that simulates the transverse dynamics of a long, intense charge bunch propagating through an alternating-gradient transport system by putting the physicist in the beam's frame of reference. A pair of arbitrary function generators was used to apply trapping voltage waveform perturbations with a range of frequencies and, by changing which electrodes were driven with the perturbation, with either a dipole or quadrupole spatial structure. The results presented in this paper explore the dependence of the perturbation voltage's effect on the perturbation duration and amplitude. Perturbations were also applied that simulate the effect of random lattice errors that exist in an accelerator with quadrupole magnets that are misaligned or have variance in their field strength. The experimental results quantify the growth in the equivalent transverse beam emittance that occurs due to the applied noise and demonstrate that the random lattice errors interact with the trapped plasma through the plasma's internal collective modes. Coherent periodic perturbations were applied to simulate the effects of magnet errors in circular machines such as storage rings. The trapped one component plasma is strongly affected when the perturbation frequency is commensurate with a plasma mode frequency. The experimental results, which help to understand the physics of quiescent intense beam propagation over large distances, are compared with analytic models. V C 2013 AIP Publishing LLC.

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Determination of Transverse Distributions of Ion Plasmas Confined in a Linear Paul Trap by Imaging Diagnostics

Cited by 9 publications

References 26 publications

Commissioning and first results of the Intense Beam EXperiment (IBEX) linear Paul trap

Commissioning and first results of the Intense Beam EXperiment (IBEX) linear Paul trap

Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals

Excitation of transverse dipole and quadrupole modes in a pure ion plasma in a linear Paul trap to study collective processes in intense beams

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