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CERN Document Server 14 záznamov nájdených  1 - 10ďalší  skoč na záznam: Hľadanie trvalo 1.28 sekúnd. 
1.
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;
Úplný záznam - Podobné záznamy
2.
RF characterisation of laser treated copper surfaces for the mitigation of electron cloud in accelerators / Krkotic, Patrick (CERN) ; Calatroni, Sergio (CERN) ; Abdolvand, Amin (Dundee U.) ; Perez Fontenla, Ana Teresa (CERN) ; Neupert, Holger (CERN) ; Himmerlich, Marcel (CERN) ; Wackerow, Stefan (Dundee U.)
In accelerator beam chambers and RF waveguides, electron cloud and multipacting can be mitigated effectively by reducing the secondary electron yield (SEY). In recent years, it has been established that laser surface structuring is a very efficient method to create a copper surface with SEY close to or even below unity. [...]
2023 - 4 p. - Published in : JACoW IPAC2023 (2023) THPA137 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPA137
Úplný záznam - Podobné záznamy
3.
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;
Úplný záznam - Podobné záznamy
4.
Efficient Combination of Surface Texturing and Functional Coating for Very Low Secondary Electron Yield Surfaces and Rough Nonevaporable Getter Films / Himmerlich, Marcel (CERN) ; Zanin, Danilo A (CERN) ; Taborelli, Mauro (CERN) ; Granadeiro Costa, Angelo Rafael (CERN) ; Costa Pinto, Pedro (CERN) ; Lain Amador, Lucia (CERN) ; Vollenberg, Wilhelmus (CERN) ; Baris, Adrienn (CERN) ; Garcia‐Tabares Valdivieso, Elisa (CERN ; Carlos III U., Madrid) ; Perez Fontenla, Ana Teresa (CERN) et al.
The formation of a fissured copper surface by picosecond pulsed laser irradiation is combined with functional coatings consisting of Ti and amorphous carbon layers or a Ti–Zr–V compound film to fabricate surfaces with the maximum of the secondary electron yield being as low as 0.4. By structural and spectroscopic analysis of the formed surfaces it is demonstrated that both coatings enclose the nanostructures generated by redeposition of metal structures from the laser-induced plasma plume, keeping the initial topography intact. [...]
2022 - 8 p. - Published in : Advanced Materials Interfaces 10 (2022) 2201671 Fulltext: PDF;
Úplný záznam - Podobné záznamy
5.
Laser Engineered Surface Structures for Custom Design of Secondary Electron Yield / Bajek, David (U. Dundee) ; Wackerow, Stefan (U. Dundee) ; Sitko, Monika (CERN) ; Calatroni, Sergio (CERN) ; Girolama, Beniamino Di (CERN) ; Abdolvand, Amin (U. Dundee)
Secondary Electron Yield (SEY) [3, 5] occurs in a system when a primary electron impinges a material's surface and induces the emission of a 1 st and potentially 2 nd generation secondary electrons (see Figure 1, Left). The total number of secondary electrons per primary electron is the SEY. [...]
2019 - 1 p. - Published in : 10.1109/CLEOE-EQEC.2019.8873330
In : 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, Munich, Germany, 23 - 27 Jun 2019
Úplný záznam - Podobné záznamy
6.
Morphological and Chemical Characterization of Laser Treated Surface on Copper / Baudin, Lucie (CERN ; U. Evry) ; Sitko, Monika (CERN) ; Garion, Cédric (CERN) ; Chiggiato, Paolo (CERN) ; Delloro, Francesco (U. Evry) ; Gaslain, Fabrice (U. Evry) ; Sennour, Mohamed (U. Evry) ; Jeandin, Michel (U. Evry) ; Bajek, David (Dundee U.) ; Wackerow, Stefan (Dundee U.) et al.
Electron multipacting and electron cloud have been identified as being the major limiting factors for the beam quality or for the cryogenic system of high-intensity positive particles accelerators. Among conditioning operational techniques and other surface structuration techniques used to decrease the Secondary Electron Yield (SEY) of surfaces, laser surface treatment is a promising method to treat in situ and at atmospheric pressure copper surface of the vacuum chamber. [...]
2019 - 7 p. - Published in : Key Eng. Mater. 813 (2019) 254-260
Úplný záznam - Podobné záznamy
7.
High-performance thermal emitters based on laser-engineered metal surfaces / Zolotovskaya, Svetlana A (U. Dundee) ; Wackerow, Stefan (U. Dundee) ; Neupert, Holger (CERN) ; Barnes, Michael J (CERN) ; Cid, Lorena Vega (CERN) ; Teissandier, Benoit (CERN) ; Fontenla, Ana Teresa Perez (U. Dundee) ; Abdolvand, Amin (U. Dundee)
Effective thermal management is of paramount importance for all high-temperature systems operating under vacuum. Cooling of such systems relies mainly on radiative heat transfer requiring high spectral emissivity of surfaces, which is strongly affected by the surface condition. Pulsed laser structuring of stainless steel in air resulted in the spectral hemispherical emissivity values exceeding 0.95 in the 2.5–15 µm spectral region [...]
2020 - 10 p. - Published in : Optical Materials Express 10 (2020) 622-631
Úplný záznam - Podobné záznamy
8.
Optimization of the secondary electron yield of laser-structured copper surfaces at room and cryogenic temperature / Calatroni, Sergio (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Perez Fontenla, Ana Teresa (CERN) ; Taborelli, Mauro (CERN) ; Neupert, Holger (CERN) ; Himmerlich, Marcel (CERN) ; Chiggiato, Paolo (CERN) ; Bajek, David (Dundee U.) ; Wackerow, Stefan (Dundee U.) ; Abdolvand, Amin (Dundee U.)
Electron cloud (e-cloud) mitigation is an essential requirement for proton circular accelerators in order to guarantee beam stability at a high intensity and limit the heat load on cryogenic sections. Laser-engineered surface structuring is considered a credible process to reduce the secondary electron yield (SEY) of the surfaces facing the beam, thus suppressing the e-cloud phenomenon within the high luminosity upgrade of the LHC collider at CERN (HL-LHC). [...]
2020 - 10 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 033101 Fulltext: PDF;
Úplný záznam - Podobné záznamy
9.
High Performance Thermal Emitters Based on Laser Engineered Surfaces / Zolotovskaya, Svetlana A (U. Dundee) ; Wackerow, Stefan (U. Dundee) ; Neupert, Holger (CERN) ; Barnes, Michael J (CERN) ; Cid, Lorena V (CERN) ; Teissandier, Benoit (CERN) ; Abdolvand, Amin (U. Dundee)
In systems experiencing high temperature load, especially those under vacuum, radiative heat transfer plays a significant role. The key material parameter in heat transfer by radiation is spectral emissivity. [...]
2019 - 1 p. - Published in : 10.1109/CLEOE-EQEC.2019.8873315
In : 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, Munich, Germany, 23 - 27 Jun 2019, pp.8873315
Úplný záznam - Podobné záznamy
10.
Role of surface microgeometries on electron escape probability and secondary electron yield of metal surfaces / Bajek, D (U. Dundee) ; Wackerow, S (U. Dundee) ; Zanin, D A (CERN) ; Baudin, L (CERN) ; Bogdanowicz, K (CERN) ; Valdivieso, E Garcia-Tabares (CERN) ; Calatroni, S (CERN) ; Di Girolamo, B (CERN) ; Sitko, M (CERN) ; Himmerlich, M (CERN) et al.
The influence of microgeometries on the Secondary Electron Yield (SEY) of surfaces is investigated. Laser written structures of different aspect ratio (height to width) on a copper surface tuned the SEY of the surface and reduced its value to less than unity. [...]
2020 - 8 p. - Published in : Sci. Rep. 10 (2020) 250 Fulltext: PDF;
Úplný záznam - Podobné záznamy

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