Complete momentum and energy resolved TOF electron spectrometer for time-resolved photoemission spectroscopy

Lebedev, Gennadi; Tremsin, Anton S.; Siegmund, O. H. W.; Chen, Yinwei; Shen, Zhi‐Xun; Hussain, Zahid

doi:10.1016/j.nima.2007.08.099

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…detecting electrons in angle-resolved photoemission spectroscopy, ARPES, on synchrotron sources [10] as well as photons in fluorescence lifetime imaging [11] requiring sub-ns temporal resolution). With the advent of neutron sensitive MCPs all the advancements in this technology can now be applied to NRAI.…”

Section: Methodsmentioning

confidence: 99%

High resolution neutron resonance absorption imaging at a pulsed neutron beamline

Tremsin¹,

McPhate²,

Vallerga³

et al. 2011

2011 IEEE Nuclear Science Symposium Conference Record

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The existence of resonance peaks in neutron absorption spectra in the epithermal range of energies enables unique non-destructive testing techniques. The deep penetration of epithermal neutrons provides the opportunity to perform a compositional analysis of a sample which is opaque to X-rays and thermal neutrons. The neutron resonances in the transmission spectra constitute a characteristic pattern for many isotopes, which can be used to identify the isotope and to map the distribution of the isotope in a sample. The neutron transmission spectra can be measured with the time of flight (TOF) technique using a pulsed neutron source. Combining this method with a high resolution neutron counting detector enables substantial improvements of spatial resolution of neutron resonance transmission imaging. Such a detector has been developed to register neutrons with 55 J.UIl spatial and 10-1000 ns temporal resolution Our proof-of-principle experiments at the ISIS pulsed neutron spallation source demonstrate that compositional analysis of multi-element samples can now be performed with -150 J.UIl spatial resolution. Images of a test mask consisting of <200 J.UIl thick foils of Au, Ag, In and Gd were collected in the 1-100 eV energy range. The experimental results demonstrate the potential for compositional analysis via resonance absorption transmission with high spatial resolution. In-bulk temperature measurement through Doppler broadening analysis will also benefit from this technique.

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Section: Methodsmentioning

confidence: 99%

High resolution neutron resonance absorption imaging at a pulsed neutron beamline

Tremsin¹,

McPhate²,

Vallerga³

et al. 2011

2011 IEEE Nuclear Science Symposium Conference Record

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“…In the general case correction of the measured timing distribution cannot be done with the method described in this paper. This technique can only be applied to the experiments where a constant or repetitive/periodically varying flux is used in the measurements, such as time of flight experiments with periodic X-ray and neutron sources and static objects [1][2][3], fluorescence lifetime imaging experiments with static samples [9] and others. Many material science experiments with pulsed neutron sources, for example, require coverage of a wide range of energies and event overlaps can alter the measured transmission spectrum [2,3].…”

Section: Event Overlap Correction Algorithmmentioning

confidence: 99%

“…Event counting detectors with timing resolution have found a wide use in various applications and provide unique opportunities in some cases, such as time-of-flight experiments (e.g. Angular Resolved Photoelectron Emission Spectroscopy [1], energy resolved neutron imaging at pulsed sources [2,3] and many others). Various detector technologies can provide timing information for each detected event.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Timepix count rate capabilities for the applications with a periodic input signal

Tremsin¹,

Vallerga²,

McPhate³

et al. 2014

J. Inst.

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The capability of a Timepix readout to detect both position (with 55 μm accuracy) and time (with up to 10 ns resolution) of multiple simultaneous events enables novel non-destructive testing methods. The first generation Timepix ASIC provides timing only for one event per pixel per frame. With fast parallel readouts capable of > 1 KHz frame rates up to ∼ 3 × 106 counts cm−2s−1 can be detected with 10% overlap probability. For some applications, where incoming fluxes exceed this rate the event overlaps distort the measured timing signal. In this case many particles arriving late in the frame are not registered as many pixels are already occupied by preceding counts.In this paper we demonstrate how the count rate capability of Timepix readout can be increased in the experiments where incoming flux has a periodic structure. It is shown how the timing characteristics of input flux can be accurately reconstructed even for ∼ 80% pixel occupancy, where the probability of detection is reduced for the later events of the acquisition frame. The implementation of the correction algorithm is demonstrated for a UV flux varying with a 60 Hz frequency. The post-measurement reconstruction method is implemented for each individual pixel of the acquired images and thus can be applied even for the experiments where the incoming flux has a strong variation across the active area.

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“…However, time-of-flight analyzers have a much wider scope of application than commonly believed. For example, the mechanism of time-of-flight separation of electrons can be used in the construction of photoelectron spectrometers [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical search for time-of-flight focusing conditions and its application to the analysis of TOF mass analyzer schemes

Kambarova,

Saulebekov,

Trubitsyn

2024

Eng. Res. Express

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A method of searching for high-order time-of-flight focusing conditions based on data of numerical trajectory analysis of corpuscular-optical systems is presented. The method makes it possible to determine the maximum achievable order of focusing, the value of the independent variable (initial coordinate, initial angle, initial velocity or energy) relative to which the focusing is observed, as well as the spatial position of focus. The method has been tested on model problems. The corpuscular-optical properties of time-of-flight devices with known analytical solutions are investigated, and the uniqueness of their parameters in their class is shown.

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Complete momentum and energy resolved TOF electron spectrometer for time-resolved photoemission spectroscopy

Cited by 10 publications

References 3 publications

High resolution neutron resonance absorption imaging at a pulsed neutron beamline

High resolution neutron resonance absorption imaging at a pulsed neutron beamline

Optimization of Timepix count rate capabilities for the applications with a periodic input signal

Numerical search for time-of-flight focusing conditions and its application to the analysis of TOF mass analyzer schemes

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