Measurements of the energy distribution of a high brightness rubidium ion beam

G. ten Haaf, S.H.W. Wouters, D.F.J. Nijhof, P.H.A. Mutsaers, E.J.D. Vredenbregt

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Uittreksel

The energy distribution of a high brightness rubidium ion beam, which is intended to be used as the source for a focused ion beam instrument, is measured with a retarding field analyzer. The ions are created from a laser-cooled and compressed atomic beam by two-step photoionization in which the ionization laser power is enhanced in a build-up cavity. Particle tracing simulations are performed to ensure the analyzer is able to resolve the distribution. The lowest achieved full width 50% energy spread is (0.205 ± 0.006) eV, which is measured at a beam current of 9 pA. The energy spread originates from the variation in the ionization position of the ions which are created inside an extraction electric field. This extraction field is essential to limit disorder-induced heating which can decrease the ion beam brightness. The ionization position distribution is limited by a tightly focused excitation laser beam. Energy distributions are measured for various ionization and excitation laser intensities and compared with calculations based on numerical solutions of the optical Bloch equations including ionization. A good agreement is found between measurements and calculations.

TaalEngels
Pagina's12-20
Aantal pagina's9
TijdschriftUltramicroscopy
Volume190
DOI's
StatusGepubliceerd - 5 apr 2018

Vingerafdruk

Rubidium
rubidium
Ion beams
Ionization
Luminance
energy distribution
brightness
ion beams
ionization
analyzers
Ions
Atomic beams
lasers
Photoionization
Laser excitation
Lasers
Focused ion beams
atomic beams
tracing
beam currents

Citeer dit

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title = "Measurements of the energy distribution of a high brightness rubidium ion beam",
abstract = "The energy distribution of a high brightness rubidium ion beam, which is intended to be used as the source for a focused ion beam instrument, is measured with a retarding field analyzer. The ions are created from a laser-cooled and compressed atomic beam by two-step photoionization in which the ionization laser power is enhanced in a build-up cavity. Particle tracing simulations are performed to ensure the analyzer is able to resolve the distribution. The lowest achieved full width 50{\%} energy spread is (0.205 ± 0.006) eV, which is measured at a beam current of 9 pA. The energy spread originates from the variation in the ionization position of the ions which are created inside an extraction electric field. This extraction field is essential to limit disorder-induced heating which can decrease the ion beam brightness. The ionization position distribution is limited by a tightly focused excitation laser beam. Energy distributions are measured for various ionization and excitation laser intensities and compared with calculations based on numerical solutions of the optical Bloch equations including ionization. A good agreement is found between measurements and calculations.",
author = "{ten Haaf}, G. and S.H.W. Wouters and D.F.J. Nijhof and P.H.A. Mutsaers and E.J.D. Vredenbregt",
note = "Copyright {\circledC} 2018 Elsevier B.V. All rights reserved.",
year = "2018",
month = "4",
day = "5",
doi = "10.1016/j.ultramic.2018.03.014",
language = "English",
volume = "190",
pages = "12--20",
journal = "Ultramicroscopy",
issn = "0304-3991",
publisher = "Elsevier",

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Measurements of the energy distribution of a high brightness rubidium ion beam. / ten Haaf, G.; Wouters, S.H.W.; Nijhof, D.F.J.; Mutsaers, P.H.A.; Vredenbregt, E.J.D.

In: Ultramicroscopy, Vol. 190, 05.04.2018, blz. 12-20.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Measurements of the energy distribution of a high brightness rubidium ion beam

AU - ten Haaf,G.

AU - Wouters,S.H.W.

AU - Nijhof,D.F.J.

AU - Mutsaers,P.H.A.

AU - Vredenbregt,E.J.D.

N1 - Copyright © 2018 Elsevier B.V. All rights reserved.

PY - 2018/4/5

Y1 - 2018/4/5

N2 - The energy distribution of a high brightness rubidium ion beam, which is intended to be used as the source for a focused ion beam instrument, is measured with a retarding field analyzer. The ions are created from a laser-cooled and compressed atomic beam by two-step photoionization in which the ionization laser power is enhanced in a build-up cavity. Particle tracing simulations are performed to ensure the analyzer is able to resolve the distribution. The lowest achieved full width 50% energy spread is (0.205 ± 0.006) eV, which is measured at a beam current of 9 pA. The energy spread originates from the variation in the ionization position of the ions which are created inside an extraction electric field. This extraction field is essential to limit disorder-induced heating which can decrease the ion beam brightness. The ionization position distribution is limited by a tightly focused excitation laser beam. Energy distributions are measured for various ionization and excitation laser intensities and compared with calculations based on numerical solutions of the optical Bloch equations including ionization. A good agreement is found between measurements and calculations.

AB - The energy distribution of a high brightness rubidium ion beam, which is intended to be used as the source for a focused ion beam instrument, is measured with a retarding field analyzer. The ions are created from a laser-cooled and compressed atomic beam by two-step photoionization in which the ionization laser power is enhanced in a build-up cavity. Particle tracing simulations are performed to ensure the analyzer is able to resolve the distribution. The lowest achieved full width 50% energy spread is (0.205 ± 0.006) eV, which is measured at a beam current of 9 pA. The energy spread originates from the variation in the ionization position of the ions which are created inside an extraction electric field. This extraction field is essential to limit disorder-induced heating which can decrease the ion beam brightness. The ionization position distribution is limited by a tightly focused excitation laser beam. Energy distributions are measured for various ionization and excitation laser intensities and compared with calculations based on numerical solutions of the optical Bloch equations including ionization. A good agreement is found between measurements and calculations.

U2 - 10.1016/j.ultramic.2018.03.014

DO - 10.1016/j.ultramic.2018.03.014

M3 - Article

VL - 190

SP - 12

EP - 20

JO - Ultramicroscopy

T2 - Ultramicroscopy

JF - Ultramicroscopy

SN - 0304-3991

ER -