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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Chiggiato, Paolo
European Organization for Nuclear Research
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Study of selected mild steels for application in vacuum systems of future gravitational wave detectorscitations
- 2019Role of the different chemical components in the conditioning process of air exposed copper surfacescitations
- 2019Cryogenic surface resistance of coppercitations
- 2019Cryogenic surface resistance of copper:Investigation of the impact of surface treatments for secondary electron yield reductioncitations
- 2017Amorphous Carbon Thin Film Coating of the SPS Beamline: Evaluation of the First Coating Implementation
- 2016Vacuum Performance of Amorphous Carbon Coating at Cryogenic Temperature with Presence of Proton Beams
- 2015Recommissioning of the COLDEX Experiment at CERN
- 2014Development of Aluminium Vacuum Chambers for the LHC Experiments at CERN
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article
Cryogenic surface resistance of copper
Abstract
The surface resistance of copper samples with an amorphous carbon (a-C) coating or with laser surface structuring, the surface treatments of choice for electron cloud suppression in critical cryogenic sectors of the high-luminosity upgrade of the Large Hadron Collider (HL-LHC), has been measured for the first time at a cryogenic temperature using the quadrupole resonator at CERN. Three different frequencies of relevance for evaluating beam impedance effects, namely, 400, 800, and 1200 MHz, have been investigated. No significant increase in surface resistance is observed for the a-C coating, compared to plain copper. In the case of laser structuring, the surface resistance depends on the direction of the surface currents relative to the laser-engraved groove pattern. The increase is minimal for parallel patterns, but in the perpendicular case the surface resistance increases considerably. Radio frequency (rf) heating from wake losses would then also increase in the HL-LHC case; however, the reduction in the power deposited onto the cold surfaces thanks to electron cloud suppression would still outweigh this effect.