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Experimental study of rf pulsed heating / Laurent, L (SLAC) ; Heikkinen, S (CERN) ; Nantista, C (SLAC) ; Dolgashev, V (SLAC) ; Higashi, Y (KEK, Tsukuba) ; Aicheler, M (CERN) ; Tantawi, S (SLAC) ; Wuensch, W (CERN)
Cyclic thermal stresses produced by rf pulsed heating can be the limiting factor on the attainable reliable gradients for room temperature linear accelerators. This is especially true for structures that have complicated features for wakefield damping. [...]
2011 - Published in : Phys. Rev. Spec. Top. Accel. Beams 14 (2011) 041001 APS Published version, local copy: PDF;

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(91)

An Experimental Investigation on Cavity Pulsed Heating / Laurent, L (SLAC) ; Dolgashev, V A (SLAC) ; Nantista, C D (SLAC) ; Tantawi, S G (SLAC) ; Aicheler, M (CERN) ; Heikkinen, S T (CERN) ; Wuensch, W (CERN) ; Higashi, Y (KEK, Tsukuba)
Cavity pulsed heating experiments have been conducted at SLAC National Accelerator Laboratory in collaboration with CERN and KEK. These experiments were designed to gain a better understanding on the impact of high power pulsed magnetic fields on copper and copper alloys. [...]
2010 Published version from LINAC10: PDF;
In : 25th Linear Accelerator Conference, Tsukuba, Japan, 12 - 17 Sep 2010, pp.MOP076

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(82)

Influence of grain orientation on evolution of surface features in fatigued polycrystalline copper: a comparison of thermal and uniaxial mechanical fatigue results / Aicheler, M (CERN)
Surface state plays a major role in the crack nucleation process of pure metals in the High-Cycle-Fatigue (HCF) as well as in the Ultra-High-Cycle-Fatigue (UHCF) regime. Therefore, in studies dealing with HCF or UHCF, special attention is paid to the evolution of surface degradation during fatigue life. [...]
2010 - Published in : J. Phys.: Conf. Ser. 240 (2010) 012051

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(78)

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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(74)

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.
Fulltext

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(65)

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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(64)

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures / Casalegno, Valentina (Polytech. Turin) ; Perero, Sergio (Polytech. Turin) ; Ferraris, Monica (Polytech. Turin) ; Taborelli, Mauro (CERN) ; Izquierdo, Gonzalo Arnau (CERN) ; Sgobba, Stefano (CERN) ; Salvo, Milena (Polytech. Turin)
Alumina dispersion-strengthened copper, Glidcop, is used widely in high-heat-load ultra-high-vacuum components for synchrotron light sources (absorbers), accelerator components (beam intercepting devices), and in nuclear power plants. Glidcop has similar thermal and electrical properties to oxygen free electrical (OFE) copper, but has superior mechanical properties, thus making it a feasible structural material; its yield and ultimate tensile strength are equivalent to those of mild-carbon steel. [...]
2018 - 13 p. - Published in : Materials 11 (2018) 1658 Fulltext: PDF;

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(63)

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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(60)

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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Thermal Fatigue of Polycrystalline Copper in CLIC Accelerating Structures: Surface Roughening and Hardening as a Function of Grain Orientation / Aicheler, M (CERN)
The accelerating structures of CLIC will be submitted to 2 x 1010 thermal-mechanical fatigue cycles, arising from Radio Frequency (RF) induced eddy currents, causing local superficial cyclic heating. In order to assess the effects of superficial fatigue, high temperature annealed OFE Copper samples were thermally fatigued with the help of pulsed laser irradiation. [...]
2010 Published version from LINAC10: PDF;
In : 25th Linear Accelerator Conference, Tsukuba, Japan, 12 - 17 Sep 2010, pp.MOP069

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