Backward transition radiation in the extreme ultraviolet region as a tool for the transverse beam profile diagnostic

Сухих, Л.; Kube, G.; Bajt, Saša; Lauth, W.; Popov, Yu. A.; Потылицын, А. П.

doi:10.1103/physrevstab.17.112805

Cited by 13 publications

(10 citation statements)

References 15 publications

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“…In order to further increase the sensitivity to a level of sub-micron spatial resolution [18], the techniques proposed in the present work could in principle be combined with detection schemes at smaller wavelengths using OTR in the UV and EUV spectral region [19].…”

Section: Resultsmentioning

confidence: 99%

“…In Fig. 13 the results of a calculation for 0.5  (19) and this parameter is considered as the ultimate resolution of an imaging optics based on an ideal lens using isotropic light emission from a point source. For the following it is more convenient to compare the different PSF characteristics based on the FWHM (full width at half maximum).…”

Section: Discussionmentioning

confidence: 99%

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Spatial resolution improvement for an optical transition radiation monitor by asymmetric light collection

Potylitsyn¹,

Сухих²,

Kube³

et al. 2018

Opt. Express

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The applicability of Optical Transition Radiation (OTR) for measurements of micron sized transverse electron beam profiles is limited not only by the optical system resolution which has a fundamental limit imposed by the uncertainty principle. In the case of OTR generation, a single electron crossing the boundary between vacuum and screen cannot be considered as a single emitting point with isotropic angular distribution. On the contrary, the radiation is emitted from an area with a transverse range that is defined by the radial extension of the electron's Lorentz contracted Coulomb field and is typically estimated as γλ (with γ the Lorentz factor and λ the wavelength of observation). The OTR angular distribution has a characteristic "funnel" shape. As a result the one-dimensional image of a single electron measured with an ideal thin lens has a double lobe shape, and the resolution of any OTR based imaging system is determined by this double lobe function which is also known as OTR Point Spread Function (PSF). As a consequence, the reconstruction of micron sized electron beam profiles is hampered not only due to the fundamental diffraction limit, but also due to the PSF lobe shape. In this paper we present two approaches to improve the spatial resolution of an OTR monitor based on asymmetric light collection using a traditional optical system which allows blocking of one of the lobes. With such a scheme, an OTR PSF can be achieved that is comparable to the one of an ideal point source (Airy distribution).

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Spatial resolution improvement for an optical transition radiation monitor by asymmetric light collection

Potylitsyn¹,

Сухих²,

Kube³

et al. 2018

Opt. Express

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show abstract

“…In order to allow beam profile measurements in the presence of the instability, transition radiation based imaging in the EUV spectral region was successfully tested [385,386]. Another possibility which was demonstrated to work properly is to eliminate the COTR influence by using a fast gated camera in combination with a scintillator screen (so-called temporal separation) [387,388].…”

Section: Instrumentation Examplesmentioning

confidence: 99%

Beam Diagnostic Requirements: an Overview

Kube

2020

Preprint

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Beam diagnostics and instrumentation are an essential part of any kind of accelerator. There is a large variety of parameters to be measured for observation of particle beams with the precision required to tune, operate, and improve the machine. In the first part, the basic mechanisms of information transfer from the beam particles to the detector are described in order to derive suitable performance characteristics for the beam properties. However, depending on the type of accelerator, for the same parameter, the working principle of a monitor may strongly differ, and related to it also the requirements for accuracy. Therefore, in the second part, selected types of accelerators are described in order to illustrate specific diagnostics needs which must be taken into account before designing a related instrument.

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“…In Refs. [17,18] it was demonstrated that backward transition radiation in the extreme ultraviolet (EUV) spectral region (λ ≈ 19 nm) can be used for beam profile imaging. While EUV transition radiation has sufficient intensity for beam diagnostics applications, the main disadvantage in this spectral region is the strong radiation absorption in any material, making it necessary to install the entire monitor setup in a vacuum system.…”

Section: Introductionmentioning

confidence: 99%

Simulation of transition radiation based beam imaging from tilted targets

Сухих

Kube

Потылицын

2017

Phys. Rev. Accel. Beams

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Transverse beam profile diagnostics in linear electron accelerators is usually based on direct imaging of a beam spot via visible transition radiation. In this case the fundamental resolution limit is determined by radiation diffraction in the optical system. A method to measure beam sizes beyond the diffraction limit is to perform imaging dominated by a single-particle function (SPF), i.e. when the recorded image is dominated not by the transverse beam profile but by the image function of a point source (single electron). Knowledge of the SPF for an experimental setup allows one to extract the transverse beam size from an SPF dominated image. This paper presents an approach that allows one to calculate two-dimensional SPF dominated beam images, taking into account the target inclination angle and the depth-of-field effect. In conclusion, a simple fit function for beam size determination in the case under consideration is proposed and its applicability is tested under various conditions.

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Backward transition radiation in the extreme ultraviolet region as a tool for the transverse beam profile diagnostic

Cited by 13 publications

References 15 publications

Spatial resolution improvement for an optical transition radiation monitor by asymmetric light collection

Spatial resolution improvement for an optical transition radiation monitor by asymmetric light collection

Beam Diagnostic Requirements: an Overview

Simulation of transition radiation based beam imaging from tilted targets

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