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CERN Document Server Pronađeno je 9 zapisa  Pretraživanje je potrajalo 0.58 sekundi 
1.
Cryogenic surface resistance of copper: Investigation of the impact of surface treatments for secondary electron yield reduction / Calatroni, Sergio (CERN) ; Arzeo, Marco (CERN) ; Aull, Sarah (CERN) ; Himmerlich, Marcel (CERN) ; Costa Pinto, Pedro (CERN) ; Vollenberg, Wilhelmus (CERN) ; Di Girolamo, Beniamino (CERN) ; Cruikshank, Paul (CERN) ; Chiggiato, Paolo (CERN) ; Bajek, David (U. Dundee) et al.
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. [...]
2019 - 9 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 063101 Fulltext from Publisher: PDF;
Detaljnije - Slični zapisi
2.
Rigorous Data Processing and Automatic Documentation of SRF Cold Tests / Hernández-Chahín, Karim (CERN ; Unlisted, MX) ; Aull, Sarah (CERN) ; Fernández López, Pablo (CERN) ; Schwerg, N (CERN) ; Stapley, Niall (CERN)
Performance curves for SRF cavities are derived from primary quantities which are processed by software. Commonly, the mathematical implementation of this analysis is hidden in software such as Excel or LabVIEW, making it difficult to verify or to trace, while text-based programming like Python and MATLAB require some programming skills for review and use. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-SRF2017-TUPB069 Fulltext: PDF;
In : 18th International Conference on RF Superconductivity, Lanzhou, China, 17 - 21 Jul 2017, pp.TUPB069
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3.
Material options for the superconducting rf system of the Future Circular Collider / Aull, Sarah ; Brunner, Olivier (CERN) ; Butterworth, Andy (CERN) ; Schwerg, Nikolai
The design of the superconducting RF (SRF) systems of the Future Circular Collider (FCC) machine variants requires a thorough comparison of the different options for cavity material, oper- ating temperature and frequency. We collected representative SRF performance data at different frequencies and temperatures of bulk niobium as the standard technology and of niobium thin films as a potential alternative and develop a perspective for future performance for all material- frequency-temperature combinations as function of accelerating gradient. [...]
CERN-ACC-2018-0019.- Geneva : CERN, 2018 Fulltext: PDF;
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4.
Diagnostic developments at CERN’s SRF testing facility / Macpherson, Alick (CERN) ; Aull, Sarah (CERN) ; Benoit, Antoine (CERN) ; Fernández López, Pablo (CERN) ; Hernández-Chahín, Karim (Mexico, ININ ; CERN) ; Jarrige, Christophe (CERN) ; Junginger, Tobias (Helmholtz-Zentrum, Berlin ; Alberta U. ; TRIUMF) ; Maesen, Pierre (CERN) ; Schirm, Karl (CERN) ; Torres-Sanchez, Roberto (CERN) et al.
As part of CERN’s re-establishment of an SRF cold testing facility for bulk niobium cavities, diagnostic instrumentation and testing procedures on our vertical cryostat have been upgraded, with particular attention given to quench location, ambient magnetic field control, thermometry and thermal cycling techniques. In addition, preparation and measurement procedures have been addressed, allowing for improved measurement of cavity properties and detailed study of transient effects during the course of cavity testing..
2015 - 5 p. - Published in : 10.18429/JACoW-SRF2015-TUPB080 Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUPB080
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5.
Secondary electron yield of SRF materials / Aull, Sarah (CERN ; Siegen U.) ; Junginger, Tobias (CERN) ; Knobloch, Jens (Helmholtz-Zentrum, Berlin ; Siegen U.) ; Neupert, Holger (CERN)
The secondary electron yield (SEY) describes the number of electrons emitted to the vacuum per arriving electron at the surface. For a given geometry, the SEY is the defining factor for multipacting activity. [...]
2015 - 5 p. - Published in : 10.18429/JACoW-SRF2015-TUPB050 Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUPB050
Detaljnije - Slični zapisi
6.
Material quality & SRF performance of Nb films grown on Cu via ECR plasma energetic condensation / Valente-Feliciano, Anne-Marie (Jefferson Lab) ; Aull, Sarah (CERN) ; Eremeev, Grigory (Jefferson Lab) ; Proslier, Thomas (Argonne (main)) ; Reece, Charles (Jefferson Lab) ; Spradlin, Joshua (Jefferson Lab)
The RF performance of bulk Nb cavities has continuously improved over the years and is approaching the intrinsic limit of the material. Although some margin seems still available with processes such as N surface doping, long term solutions for SRF surfaces efficiency enhancement need to be pursued. [...]
2015 - 4 p. - Published in : 10.18429/JACoW-SRF2015-TUPB029 Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUPB029
Detaljnije - Slični zapisi
7.
Developments on SRF coatings at CERN / Sublet, Alban (CERN) ; Aull, Sarah (CERN) ; Bártová, Barbora (CERN) ; Calatroni, Sergio (CERN) ; Richard, Thibaut (CERN) ; Rosaz, Guillaume (CERN) ; Taborelli, Mauro (CERN) ; Therasse, Mathieu (CERN) ; Venturini Delsolaro, Walter (CERN) ; Zhang, Pei (CERN)
The thin films techniques applied to Superconducting RF (SRF) has a long history at CERN. A large panel of cavities have been coated from LEP, to LHC. [...]
2015 - 5 p. - Published in : 10.18429/JACoW-SRF2015-TUPB027 Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUPB027
Detaljnije - Slični zapisi
8.
On the understanding of Q-slope of niobium thin films / Aull, Sarah (CERN) ; Junginger, Tobias (CERN) ; Knobloch, Jens (Helmholtz-Zentrum, Berlin ; Siegen U.) ; Sublet, Alban (CERN) ; Valente-Feliciano, Anne-Marie (Jefferson Lab) ; Venturini Delsolaro, Walter (CERN) ; Zhang, Pei (CERN)
The Q-slope of niobium coated copper cavities at medium fields is still the limiting factor for the application the Nb/Cu technology in accelerators. This paper presents a dedicated study of a niobium coating with bulk-like characteristics which shows a Q-slope comparable to bulk Nb at 400 MHz and 4 K. [...]
2015 - 7 p. - Published in : 10.18429/JACoW-SRF2015-TUBA03 Fulltext: PDF;
In : 17th International Conference on RF Superconductivity, Whistler, Canada, 13 - 18 Sep 2015, pp.TUBA03
Detaljnije - Slični zapisi
9.
Experimental evidence for electric surface resistance in niobium / Junginger, Tobias (Helmholtz-Zentrum, Berlin) ; Aull, Sarah (CERN) ; Weingarten, Wolfgang (CERN) ; Welsch, Carsten Peter (Liverpool U.)
Identifying the loss mechanisms of niobium cavities enables an accurate determination of applications for future accelerator projects and points to research topics required to mitigate current limitations. For several cavities an increasing surface resistance above a threshold field, saturating at higher field has been observed. [...]
arXiv:1302.2802.- 2017-08-17 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 3500607 Fulltext: PDF; External links: 00001 Surface resistance of an elliptical \unit[1300]{MHz} bulk niobium cavity at \unit[2]{K}. Data taken by Romanenko et al. \cite{Romanenko2013}; 00000 Schematic view of energy states at thermal equilibrium near the interface of superconducting niobium and niobium-pentoxide Nb2O5; (left) after exposure to a positive and (right) to a negative electric field $E_\bot$. Note that the population of occupied electron states in Nb$_2$O$_2$ is modified after the exposure of the electric field which indicates current flow. The degree of half-toning indicates the density of states. E$_F$ is the Fermi energy and $\Delta$ is the energy gap of superconducting niobium.; 00002 Surface resistance $R\msub{S}$ of a niobium film sample tested with Quadrupole Resonator at \unit[400]{MHz} (\unit[2.5]{K} (blue), \unit[4]{K} (magenta)) and \unit[800]{MHz} (\unit[2.5]{K} (black), \unit[4]{K} (red). $R\msub{S}$ was obtained under the assumption that all losses are solely caused by the surface magnetic field.; 00003 Electric surface resistance at \unit[400]{MHz} (\unit[2.5]{K} (blue), \unit[4]{K} (magenta)) and \unit[800]{MHz} (\unit[2.5]{K} (black), \unit[4]{K} (red)) of a niobium film sample. The lines show predictions from a collective least squares multiparameter fit to a data set comprising 183 values $R\msub{S}(f,T,E)$. The data dsiplayed is the same as in Fig. \ref{figure:RB_NbCU} without losses independent on field strength. These were subtracted from each curve. All field dependent losses are assumed to be caused by the surface electric field.
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