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CERN Document Server Sök i 9 journaler efter:  Sökningen tog 1.34 sekunder. 
1.
Estimation of the thermal radiation induced desorption yield for hydrogen and helium at liquid helium temperatures / Jenninger, Berthold (CERN) ; Bez, Elena (CERN) ; Stöltzel, Anke (CERN) ; Rooijakkers, Fleur (CERN) ; Tiirinen, Eino (CERN)
Infrared radiation induced desorption of adsorbed molecules from cryogenic surfaces can lead to potentially detrimental pressure limitation in cryogenic UHV/XHV systems. For a sub-monolayer coverage, we determined the corresponding yields for hydrogen and helium exposed to room temperature radiation to be in the order of 1·10−4 and 0.02 m2(W·s)−1 respectively. [...]
2024 - 4 p. - Published in : Vacuum 233 (2025) 113931 Fulltext: PDF;
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2.
Cleaning of laser-induced periodic surface structures on copper by gentle wet chemical processing / Lorenz, Pierre (TROPOS, Leibniz) ; Ehrhardt, Martin (TROPOS, Leibniz) ; Lotnyk, Andriy (TROPOS, Leibniz) ; Griebel, Jan (TROPOS, Leibniz) ; Zimmer, Klaus (TROPOS, Leibniz) ; Zajadacz, Joachim (TROPOS, Leibniz) ; Himmerlich, Marcel (CERN) ; Bez, Elena (CERN ; Leipzig U.) ; Taborelli, Mauro (CERN) ; Rosenow, Steffen (Leipzig U.) et al.
•Cleaning of 365 nm LIPSS from debris of with microemulsions has been demonstrated.•Excellent debris and particles removal while maintaining the LIPSS pattern were found.•The cleaning mechanism is dominated of selective dissolution of nanomaterial and oxides. Laser-induced periodic surface structures (LIPSS) attract considerable attention due to the manifold applications enabled by these self-organised structures ranging from optical colouring to bio-mimicking or wetting effects. [...]
2024 - 10 p. - Published in : Appl. Surf. Sci. 679 (2025) 161115 Fulltext: PDF;
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3.
Pulse Duration Dependence of Infrared Laser-Induced Secondary Electron Yield Reduction of Copper Surfaces / Lorenz, Pierre (TROPOS, Leibniz) ; Bez, Elena (CERN ; Leipzig U.) ; Himmerlich, Marcel (CERN) ; Ehrhardt, Martin (CERN) ; Taborelli, Mauro (CERN) ; Zimmer, Klaus
The irradiation of metals with ultrashort laser pulses enables the rapid and cost-effective production of nanostructured surfaces with a wide range of industrial applications. The laser-induced surface roughening modifies the interaction processes upon electron impact, leading to a modification of the secondary electron emission [...]
2023 - 6 p. - Published in : 10.2961/jlmn.2023.03.2002 Fulltext: PDF;
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4.
Out of focus ultrafast processing of metals for reduced secondary electron yield / Uren, Robin (U. Dundee) ; Din, A (U. Dundee) ; Wackerow, S (U. Dundee) ; Bez, E (CERN) ; Pfeiffer, S (CERN) ; Rimoldi, M (CERN) ; Himmerlich, M (CERN) ; Taborelli, M (CERN) ; Abdolvand, A (U. Dundee)
We have demonstrated out-of-focus ultrafast pulsed laser processing of copper with a variable working distance, without the need for mechanical movement. This was achieved by employing a diffractive optical element. [...]
2023 - 13 p. - Published in : Opt. Mater. Express 13 (2023) 1228 Fulltext: PDF;
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5.
Laser-induced periodic surface structuring for secondary electron yield reduction of copper: dependence on ambient gas and wavelength / Nivas, Jijil JJ (INFN, Naples ; Naples U. ; U. Naples (main) ; CNR-SPIN, Naples) ; Hu, Meilin (U. Naples (main)) ; Valadan, Mohammadhassan (INFN, Naples ; Naples U.) ; Salvatore, Marcella (U. Naples (main) ; Naples U.) ; Fittipaldi, Rosalba (INFN, Naples ; Naples U. ; U. Salerno (main)) ; Himmerlich, Marcel (CERN) ; Bez, Elena (CERN ; Leipzig U.) ; Rimoldi, Martino (CERN) ; Passarelli, Andrea (INFN, Naples ; Naples U.) ; Oscurato, Stefano L (U. Naples (main)) et al.
One of the main limitations for future high-performance accelerators operating with positively charged particles is the formation of an electron-cloud inside the beam vacuum chamber, giving rise to instabilities. The Secondary Electron Yield (SEY) of the beam-facing surfaces gives a measure of the mechanism which drives this phenomenon. [...]
2023 - 11 p. - Published in : Appl. Surf. Sci. 622 (2023) 156908 Fulltext: PDF;
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6.
Picosecond pulsed 532 nm laser system for roughening and secondary electron yield reduction of inner surfaces of up to 15 m long tubes / Bez, Elena (CERN ; Leipzig U.) ; Himmerlich, Marcel (CERN) ; Beaudou, Benoit (XLIM, Limoges) ; Portilla, Ana Karen Reascos (CERN) ; Wackerow, Stefan (U. Dundee) ; Rimoldi, Martino (CERN) ; Pfeiffer, Stephan (CERN) ; Wiesendanger, Markus (Zurich U.) ; Benabid, Fetah (XLIM, Limoges) ; Taborelli, Mauro (CERN) et al.
Laser-induced surface structuring is a promising method to suppress electron mulitpacting in the vacuum pipes of particle accelerators. Electrons are scattered inside the rough surface structure, resulting in a low Secondary Electron Yield (SEY) of the material. [...]
2023 - 11 p. - Published in : Rev. Sci. Instrum. 94 (2023) 103007 Fulltext: PDF;
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7.
Secondary electron yield engineering of copper surfaces using ultra short infrared laser pulses / Lorenz, Pierre ; Himmerlich, Marcel (CERN) ; Ehrhardt, Martin ; Bez, Elena (CERN) ; Bogdanowicz, Karolina (CERN) ; Taborelli, Mauro (CERN) ; Zimmer, Klaus
The texturing of copper surfaces with ultrashort laser pulses leads to microscopic groove formation but results also in nanostructure development at the surface. Both structure types, micro- and nanostructures, are influenced by the laser processing parameters such as the laser power, the scanning speed, the repetition rate, and the line spacing. [...]
2022 - Published in : 10.1117/12.2609463
In : Laser-based Micro- and Nanoprocessing XVI, San Francisco, California, United States, 22 -27 Jan 2022
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8.
Influence of wavelength and accumulated fluence at picosecond laser-induced surface roughening of copper on secondary electron yield / Bez, Elena (CERN ; Leipzig U.) ; Himmerlich, Marcel (CERN) ; Lorenz, Pierre ; Ehrhardt, Martin ; Gunn, Aidan Graham (CERN) ; Pfeiffer, Stephan (CERN) ; Rimoldi, Martino (CERN) ; Taborelli, Mauro (CERN) ; Zimmer, Klaus ; Chiggiato, Paolo (CERN) et al.
Ultrashort-pulse laser processing of copper is performed in air to reduce the secondary electron yield (SEY). By UV (355 nm), green (532 nm), and IR (1064 nm) laser-light induced surface modification, this study investigates the influence of the most relevant experimental parameters, such as laser power, scanning speed, and scanning line distance (represented as accumulated fluence) on the ablation depth, surface oxidation, topography, and ultimately on the SEY. [...]
2023 - 10 p. - Published in : J. Appl. Phys. 133 (2023) 035303 Fulltext: PDF;
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9.
A Reliable Monitoring and Control System for Vacuum Surface Treatments / Tagg, Joseph (CERN) ; Bez, Elena (CERN) ; Himmerlich, Marcel (CERN) ; Reascos Portilla, Ana Karen (CERN)
Secondary electron yield (SEY) of beam-screens in the LHC puts limits on the performance of the accelerator. To ramp up the luminosity for the HiLumi LHC project, the vacuum surface coatings team are coming up with ways to treat the surfaces to control the electron cloud and bring the SEY down to acceptable levels. [...]
2022 - 5 p. - Published in : JACoW ICALEPCS2021 (2022) 492-496 Fulltext: PDF;
In : 18th International Conference on Accelerator and Large Experimental Physics Control Systems, Online, 18 - 22 Oct 2021, pp.492-496
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