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CERN Document Server 找到 2,036 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 0.23 秒. 
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Status of the Fatigue Studies on the CLIC Accelerating Structures / Calatroni, S (CERN) ; Heikkinen, Samuli Tapio (Helsinki University of Technology, Finland ; CERN) ; Neupert, H (CERN) ; Wuensch, Walter (CERN)
The need for high accelerating gradients for the future multi-TeV e+e- Compact Linear Collider (CLIC) imposes considerable constraints on the materials of the accelerating structures. The surfaces exposed to high pulsed RF (Radio Frequency) currents are subject to cyclic thermal stresses which are expected to induce surface break up by fatigue [...]
CERN-AB-2006-031; CLIC-Note-678.- Geneva : CERN, 2006 - 4 p. Fulltext: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.858
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High Power RF Induced Thermal Fatigue in the High Gradient CLIC Accelerating Structures / Arnau-Izquierdo, G (Helsinki U. of Tech.) ; Calatroni, S (Helsinki U. of Tech.) ; Heikkinen, S (Helsinki U. of Tech.) ; Neupert, N (CERN) ; Wuensch, W (CERN)
The need for high accelerating gradients for the CLIC (Compact Linear Collider) imposes considerable constraints on the materials of the accelerating structures. [...]
CERN-OPEN-2007-013 ; CLIC-Note-708. - 2007 - 13.
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3.
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Evolution of surface topography in dependence on the grain orientation during surface thermal fatigue of polycrystalline copper / Aicheler, M (CERN) ; Arnau-Izquierdo, G (CERN) ; Taborelli, M (CERN) ; Calatroni, S (CERN) ; Neupert, H (CERN) ; Wuensch, W (CERN) ; Sgobba, S (CERN)
Surface degradation due to cyclic thermal loading plays a major role in the Accelerating Structures (AS) of the future Compact Linear Collider (CLIC) In this article results on surface degradation of thermally cycled polycrystalline copper as a function of the orientation of surface grains are presented Samples with different grain sizes were subjected to thermal fatigue using two different methods and were then characterized using roughness measurements and Orientation Imaging Scanning-Electron-Microscopy (OIM-SEM) Samples fatigued by a pulsed laser show the same trend in the orientation-fatigue damage accumulation as the sample fatigued by pulsed Radio-Frequency-heating (RF) it is clearly shown that 11 1 1] surface grains develop significantly more damage than the surface grains oriented in {[}100] and three reasons for this behaviour are pointed out Based on observations performed near grain boundaries their role in the crack initiation process is discussed The results are in good agreement with previous findings and can be Interpreted on the basis of existing theories Finally the fatigue effects Induced by the two different applied types of thermal cycling are compared (C) 2010 Elsevier Ltd All rights reserved
2011 - Published in : Int. J. Fatigue 33 (2011) 396-402
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Thermo-structural analysis of the rf-induced pulsed surface heating of the CLIC accelerating structures / Huopana, Jouni Juhani (Oulu U.) ; Heikkinen, Samuli Tapio (Helsinki U. of Tech.)
The CLIC (Compact LInear Collider) is being studied at CERN as a potential multi-TeV e+e- collider. [...]
CERN-OPEN-2007-002 ; CLIC-Note-702. - 2006 - 24.
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5.
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Status of Studies and Tests on the CLIC High-gradient Accelerating Structures / Aksakal, H ; Braun, H H ; Calatroni, S ; Carron, G ; Corsini, R ; Döbert, S ; Fandos,, R ; Grudiev, A ; Heikkinen, S ; Jensen, E et al.
CARE-Note-2006-026-ELAN ; CARE-ELAN-Document-2006-017. - 2006.
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6.
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Thermal fatigue issues in high-gradient particle accelerators / Heikkinen, Samuli Tapio (CERN) ; Calatroni, Sergio (CERN) ; Neupert, Holger (CERN)
The CLIC (Compact LInear Collider) is being studied at CERN (European Organization for Nuclear Research) as a possible future high-energy (0.5-5 TeV centre-of-mass) physics facility. [...]
CERN-OPEN-2006-004 ; CLIC-Note-648. - 2006 - 5.
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7.
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Fatigue Testing of Materials by UV Pulsed Laser Irradiation / Calatroni, S (CERN) ; Neupert, H (CERN) ; Taborelli, M (CERN)
The energy dissipated by the RF currents in the cavities of pulsed high-power linacs induces cycles of the surface temperature. In the case of the CLIC main linac the expected amplitude of the thermal cycles is above fifty degrees, for a total number of pulses reaching 1011. [...]
CERN-TS-2004-004-MME; CLIC-Note-615.- Geneva : CERN, 2004 - 4 p. Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.557 - Please contact the library if you need to access this document.
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Material Selection and Characterization for High Gradient RF Applications / Arnau-Izquierdo, G ; Calatroni, S ; Heikkinen, S ; Ramsvik, T ; Sgobba, Stefano ; Taborelli, M ; Wuensch, W
The selection of candidate materials for the accelerating cavities of the Compact Linear Collider (CLIC) is carried out in parallel with high power RF testing. The maximum DC breakdown field of copper, copper alloys, refractory metals, aluminium and titanium have been measured with a dedicated setup. [...]
CERN-OPEN-2007-025; CLIC-Note-725.- Geneva : CERN, 2007 - 4 p. Access to fulltext document: PDF;
In : 22nd Particle Accelerator Conference, Albuquerque, NM, USA, 25 - 29 Jun 2007, pp.2197-2199
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Thermally Induced Ultra High Cycle Fatigue of Copper Alloys of the High Gradient Accelerating Structures / Heikkinen, Samuli
In order to keep the overall length of the compact linear collider (CLIC), currently being studied at the European Organization for Nuclear Research (CERN), within reasonable limits, i.e [...]
CERN-THESIS-2010-203 TKK-ME-DIS-10 ; CLIC-Note-859. - Helsinki : Helsinki U. of Tech., 2010 - 122.

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dc breakdown conditioning and breakdown rate of metals and metallic alloys under ultrahigh vacuum / Descoeudres, A (CERN) ; Ramsvik, T (CERN) ; Calatroni, S (CERN) ; Taborelli, M (CERN) ; Wuensch, W (CERN)
RF accelerating structures of the Compact Linear Collider (CLIC) require a material capable of sustaining high electric field with a low breakdown rate and low induced damage. Because of the similarity of many aspects of DC and RF breakdown, a DC breakdown study is underway at CERN in order to test candidate materials and surface preparations, and have a better understanding of the breakdown mechanism under ultra-high vacuum in a simple setup. [...]
CERN-OPEN-2010-004; CLIC-Note-780.- Geneva : CERN, 2009 - 12 p. - Published in : Phys. Rev. Spec. Top. Accel. Beams 12 (2009) 032001 APS Published version, local copy: PDF; Preprint: PDF;
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