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მთავარი > ძიების შედეგები: Neupert, Holger
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დახარისხება: შედეგების ჩვენება: გამავალი ფორმატი:
CERN Document Server 22 ჩანაწერია ნაპოვნი  1 - 10შემდეგიდასასრული  ჩანაწერთან გადასვლა: ძიებას დასჭირდა 0.87 წამი. 
1.
Hot electron enhanced photoemission from laser fabricated plasmonic photocathodes / Martinez-Calderon, Miguel (CERN) ; Groussin, Baptiste (CERN) ; Bjelland, Victoria (CERN ; Norwegian U. Sci. Tech.) ; Chevallay, Eric (CERN) ; Fedosseev, Valentin N (CERN) ; Himmerlich, Marcel (CERN) ; Lorenz, Pierre ; Manjavacas, Alejandro ; Marsh, Bruce A (CERN) ; Neupert, Holger (CERN) et al.
Photocathodes are key elements in high-brightness electron sources and ubiquitous in the operation of large-scale accelerators, although their operation is often limited by their quantum efficiency and lifetime. Here, we propose to overcome these limitations by utilizing direct-laser nanostructuring techniques on copper substrates, improving their efficiency and robustness for next-generation electron photoinjectors. [...]
2023 - 9 p. - Published in : 10.1515/nanoph-2023-0552 Fulltext: PDF;
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
2.
The Role of Hydrogen Incorporation into Amorphous Carbon Films in the Change of the Secondary Electron Yield / Bundaleski, Nenad (New Lisbon U.) ; Adame, Carolina F. (New Lisbon U.) ; Alves, Eduardo (IST, Lisbon ; Lisbon U.) ; Barradas, Nuno P. (IST, Lisbon ; Lisbon U.) ; Cerqueira, Maria F. (Minho U.) ; Deuermeier, Jonas (New Lisbon U.) ; Delaup, Yorick ; Ferraria, Ana M. (IST, Lisbon) ; Ferreira, Isabel M.M. (New Lisbon U.) ; Neupert, Holger (CERN) et al.
Over the last few years, there has been increasing interest in the use of amorphous carbon thin films with low secondary electron yield (SEY) to mitigate electron multipacting in particle accelerators and RF devices. Previous works found that the SEY increases with the amount of incorporated hydrogen and correlates with the Tauc gap. [...]
2023 - 20 p. - Published in : Int. J. Molecular Sci. 24 (2023) 12999 Fulltext: PDF;
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
3.
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
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
4.
Origin and Mitigation of the Beam-Induced Surface Modifications of the LHC Beam Screens / Petit, Valentine (CERN) ; Chiggiato, Paolo (CERN) ; Himmerlich, Marcel (CERN) ; Marinoni, Stefano (CERN) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Tavian, Laurent (CERN)
All over Run 2, the LHC beam-induced heat load on the cryogenic system exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpected high Secondary Electron Yield (SEY) of the beam screen surface in some LHC regions. [...]
2022 - 3 p. - Published in : JACoW IPAC 2022 (2022) 780-782 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.780-782
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
5.
Amorphous and Diamond-Like Carbon coatings for SEY reduction of dielectric materials for accelerating structure applications / Grudiev, Alexej (CERN) ; Neupert, Holger (CERN) ; Vollenberg, Wilhelmus (CERN) ; Jing, Chunguang (Euclid Techlabs LLC) ; Poddar, Shashi (Euclid Techlabs LLC) ; Freemire, Ben (Euclid Techlabs LLC)
Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology for future high energy physics machines and other applications. [...]
CERN-ACC-2022-0006 ; CLIC-Note-1175. - 2022 - 16.
Full text
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
6.
Beam-Induced Surface Modification of the LHC Beam Screens: The Reason for the High Heat Load in Some LHC Arcs? / Petit, Valentine (CERN) ; Chiggiato, Paolo (CERN) ; Himmerlich, Marcel (CERN) ; Iadarola, Giovanni (CERN) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Zanin, Danilo A (CERN)
All over Run 2, the LHC beam-induced heat load exhibited a wide scattering along the ring. Studies ascribed the heat source to electron cloud build-up, indicating an unexpectedly high Secondary Electron Yield (SEY) of the beam screen surface in some LHC regions. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 3479-3482 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3479-3482
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
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
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
8.
Beam-induced surface modifications as a critical source of heat loads in the Large Hadron Collider / Petit, Valentine (CERN) ; Taborelli, Mauro (CERN) ; Zanin, Danilo Andrea (CERN) ; Himmerlich, Marcel (CERN) ; Neupert, Holger (CERN) ; Chiggiato, Paolo (CERN) ; Iadarola, Giovanni (CERN)
Beam-induced heat loads on the cryogenic regions of the Large Hadron Collider (LHC) exhibit a wide and unexpected dispersion along the accelerator, with potential impact on the performance of its High-Luminosity upgrade. Studies related the heat load source to the avalanche multiplication of electrons at the surface of the beam vacuum chamber, a phenomenon known as electron could build-up. [...]
2021 - 10 p. - Published in : Commun. Phys. 4 (2021) 192 Fulltext: PDF;
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
9.
Secondary electron yield on cryogenic surfaces as a function of physisorbed gases / Kuzucan, Asena (CERN ; Vienna, Tech. U.) ; Neupert, Holger (CERN) ; Taborelli, Mauro (CERN) ; Störi, Herbert (TU Vienna)
Electron cloud is an important limitation for the operation of particle accelerators with intense positively charged beams and short bunch spacing. It occurs if the secondary electron yield (SEY) of the beam-pipe inner wall is sufficiently high to promote electron multiplication. [...]
2012 - Published in : J. Vac. Sci. Technol. A 30 (2012) 051401
დეტალური ჩანაწერი - მსგავსი ჩანაწერები
10.
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;
დეტალური ჩანაწერი - მსგავსი ჩანაწერები

CERN Document Server : 22 ჩანაწერია ნაპოვნი   1 - 10შემდეგიდასასრული  ჩანაწერთან გადასვლა:
ასევე იხილეთ: მსგავსი ავტორის სახელები
28 Neupert, H
3 Neupert, H.
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