High beam-current density of a 10-keV nano-focus X-ray source

P. F. Wang; Q. L. Dong; W. P. Li; J. B. Liu

doi:10.1016/j.nima.2019.06.049

High beam-current density of a 10-keV nano-focus X-ray source

P. F. Wang
, Q. L. Dong
, W. P. Li^*
, J. B. Liu

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The electron beam-current density at a target greatly affects imaging intensity and contrast when using a low-energy nano-focus X-ray source. This paper proposes a new electron gun comprising a 10-keV nano-focus X-ray source with a single-pole magnetic lens to improve its effective brightness and beam-current density. After analyzing the effect of the electric field on the extended Schottky emission, we first optimized the anode with high effective brightness and a fine virtual spot with enough intensity for nano-focus X-ray imaging. High effective beam-current density was then obtained by optimizing the position, geometry and electrical supplies of the single-pole magnetic lens. The effective brightness of this electron gun is 1.70×10⁸ A•cm⁻²•sr⁻¹, and the nano-focus X-ray source has a spot size of 41 nm when its tube current is 2 μA. This electron gun achieves higher beam current density (1.6×10⁵A•cm⁻²), and its collimated landing beam efficiently transports the beam current in the X-ray source.

Original language	English
Pages (from-to)	475-478
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	940
DOIs	https://doi.org/10.1016/j.nima.2019.06.049
State	Published - 1 Oct 2019

Keywords

Beam current density
Electron gun
X-ray source

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10.1016/j.nima.2019.06.049

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title = "High beam-current density of a 10-keV nano-focus X-ray source",

abstract = "The electron beam-current density at a target greatly affects imaging intensity and contrast when using a low-energy nano-focus X-ray source. This paper proposes a new electron gun comprising a 10-keV nano-focus X-ray source with a single-pole magnetic lens to improve its effective brightness and beam-current density. After analyzing the effect of the electric field on the extended Schottky emission, we first optimized the anode with high effective brightness and a fine virtual spot with enough intensity for nano-focus X-ray imaging. High effective beam-current density was then obtained by optimizing the position, geometry and electrical supplies of the single-pole magnetic lens. The effective brightness of this electron gun is 1.70×108 A•cm−2•sr−1, and the nano-focus X-ray source has a spot size of 41 nm when its tube current is 2 μA. This electron gun achieves higher beam current density (1.6×105A•cm−2), and its collimated landing beam efficiently transports the beam current in the X-ray source.",

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note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = oct,

day = "1",

doi = "10.1016/j.nima.2019.06.049",

language = "英语",

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T1 - High beam-current density of a 10-keV nano-focus X-ray source

AU - Wang, P. F.

AU - Dong, Q. L.

AU - Li, W. P.

AU - Liu, J. B.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - The electron beam-current density at a target greatly affects imaging intensity and contrast when using a low-energy nano-focus X-ray source. This paper proposes a new electron gun comprising a 10-keV nano-focus X-ray source with a single-pole magnetic lens to improve its effective brightness and beam-current density. After analyzing the effect of the electric field on the extended Schottky emission, we first optimized the anode with high effective brightness and a fine virtual spot with enough intensity for nano-focus X-ray imaging. High effective beam-current density was then obtained by optimizing the position, geometry and electrical supplies of the single-pole magnetic lens. The effective brightness of this electron gun is 1.70×108 A•cm−2•sr−1, and the nano-focus X-ray source has a spot size of 41 nm when its tube current is 2 μA. This electron gun achieves higher beam current density (1.6×105A•cm−2), and its collimated landing beam efficiently transports the beam current in the X-ray source.

AB - The electron beam-current density at a target greatly affects imaging intensity and contrast when using a low-energy nano-focus X-ray source. This paper proposes a new electron gun comprising a 10-keV nano-focus X-ray source with a single-pole magnetic lens to improve its effective brightness and beam-current density. After analyzing the effect of the electric field on the extended Schottky emission, we first optimized the anode with high effective brightness and a fine virtual spot with enough intensity for nano-focus X-ray imaging. High effective beam-current density was then obtained by optimizing the position, geometry and electrical supplies of the single-pole magnetic lens. The effective brightness of this electron gun is 1.70×108 A•cm−2•sr−1, and the nano-focus X-ray source has a spot size of 41 nm when its tube current is 2 μA. This electron gun achieves higher beam current density (1.6×105A•cm−2), and its collimated landing beam efficiently transports the beam current in the X-ray source.

KW - Beam current density

KW - Electron gun

KW - X-ray source

UR - https://www.scopus.com/pages/publications/85068213514

U2 - 10.1016/j.nima.2019.06.049

DO - 10.1016/j.nima.2019.06.049

M3 - 文章

AN - SCOPUS:85068213514

SN - 0168-9002

VL - 940

SP - 475

EP - 478

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

ER -

High beam-current density of a 10-keV nano-focus X-ray source

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Keywords

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