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Microfocusing of the FERMI@Elettra FEL beam with a K–B active optics system: Spot size predictions by application of the WISE code.

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Title: Microfocusing of the FERMI@Elettra FEL beam with a K–B active optics system: Spot size predictions by application of the WISE code.
Authors: Raimondi, L.1 lorenzo.raimondi@elettra.trieste.it, Svetina, C.1, Mahne, N.1, Cocco, D.2, Abrami, A.1, De Marco, M.1, Fava, C.1, Gerusina, S.1, Gobessi, R.1, Capotondi, F.1, Pedersoli, E.1, Kiskinova, M.1, De Ninno, G.1,3, Zeitoun, P.4, Dovillaire, G.5, Lambert, G.4, Boutu, W.6, Merdji, H.6, Gonzalez, A.I.6, Gauthier, D.3
Source: Nuclear Instruments & Methods in Physics Research Section A. May2013, Vol. 710, p131-138. 8p.
Subjects: Free electron lasers, Metrology, Diffraction gratings, Photon beams, Physical optics, Photon transport theory, Prediction theory
Abstract: Abstract: FERMI@Elettra, the first seeded EUV-SXR free electron laser (FEL) facility located at Elettra Sincrotrone Trieste has been conceived to provide very short (10–100fs) pulses with ultrahigh peak brightness and wavelengths from 100nm to 4nm. A section fully dedicated to the photon transport and analysis diagnostics, named PADReS, has already been installed and commissioned. Three of the beamlines, EIS-TIMEX, DiProI and LDM, installed after the PADReS section, are in advanced commissioning state and will accept the first users in December 2012. These beam lines employ active X-ray optics in order to focus the FEL beam as well as to perform a controlled beam-shaping at focus. Starting from mirror surface metrology characterization, it is difficult to predict the focal spot shape applying only methods based on geometrical optics such as the ray tracing. Within the geometrical optics approach one cannot take into account the diffraction effect from the optics edges, i.e. the aperture diffraction, and the impact of different surface spatial wavelengths to the spot size degradation. Both these effects are strongly dependent on the photon beam energy and mirror incident angles. We employed a method based on physical optics, which applies the Huygens–Fresnel principle to reflection (on which the WISE code is based). In this work we report the results of the first measurements of the focal spot in the DiProI beamline end-station and compare them to the predictions computed with Shadow code and WISE code, starting from the mirror surface profile characterization. [Copyright &y& Elsevier]
Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Microfocusing of the FERMI@Elettra FEL beam with a K–B active optics system: Spot size predictions by application of the WISE code.
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  Data: <searchLink fieldCode="AR" term="%22Raimondi%2C+L%2E%22">Raimondi, L.</searchLink><relatesTo>1</relatesTo><i> lorenzo.raimondi@elettra.trieste.it</i><br /><searchLink fieldCode="AR" term="%22Svetina%2C+C%2E%22">Svetina, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mahne%2C+N%2E%22">Mahne, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cocco%2C+D%2E%22">Cocco, D.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Abrami%2C+A%2E%22">Abrami, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22De+Marco%2C+M%2E%22">De Marco, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fava%2C+C%2E%22">Fava, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gerusina%2C+S%2E%22">Gerusina, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gobessi%2C+R%2E%22">Gobessi, R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Capotondi%2C+F%2E%22">Capotondi, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pedersoli%2C+E%2E%22">Pedersoli, E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kiskinova%2C+M%2E%22">Kiskinova, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22De+Ninno%2C+G%2E%22">De Ninno, G.</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Zeitoun%2C+P%2E%22">Zeitoun, P.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Dovillaire%2C+G%2E%22">Dovillaire, G.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Lambert%2C+G%2E%22">Lambert, G.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Boutu%2C+W%2E%22">Boutu, W.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Merdji%2C+H%2E%22">Merdji, H.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Gonzalez%2C+A%2EI%2E%22">Gonzalez, A.I.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Gauthier%2C+D%2E%22">Gauthier, D.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+A%22">Nuclear Instruments & Methods in Physics Research Section A</searchLink>. May2013, Vol. 710, p131-138. 8p.
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  Data: Abstract: FERMI@Elettra, the first seeded EUV-SXR free electron laser (FEL) facility located at Elettra Sincrotrone Trieste has been conceived to provide very short (10–100fs) pulses with ultrahigh peak brightness and wavelengths from 100nm to 4nm. A section fully dedicated to the photon transport and analysis diagnostics, named PADReS, has already been installed and commissioned. Three of the beamlines, EIS-TIMEX, DiProI and LDM, installed after the PADReS section, are in advanced commissioning state and will accept the first users in December 2012. These beam lines employ active X-ray optics in order to focus the FEL beam as well as to perform a controlled beam-shaping at focus. Starting from mirror surface metrology characterization, it is difficult to predict the focal spot shape applying only methods based on geometrical optics such as the ray tracing. Within the geometrical optics approach one cannot take into account the diffraction effect from the optics edges, i.e. the aperture diffraction, and the impact of different surface spatial wavelengths to the spot size degradation. Both these effects are strongly dependent on the photon beam energy and mirror incident angles. We employed a method based on physical optics, which applies the Huygens–Fresnel principle to reflection (on which the WISE code is based). In this work we report the results of the first measurements of the focal spot in the DiProI beamline end-station and compare them to the predictions computed with Shadow code and WISE code, starting from the mirror surface profile characterization. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Diffraction gratings
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      – SubjectFull: Prediction theory
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      – TitleFull: Microfocusing of the FERMI@Elettra FEL beam with a K–B active optics system: Spot size predictions by application of the WISE code.
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