Garching bei Munchen, Germany
Garching bei Munchen, Germany
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Dalawai S.P.,Shivaji University | Gadkari A.B.,GKG College | Shinde T.J.,KRP - Mechatec Engineering GbR | Vasambekar P.N.,Shivaji University
International Journal of ChemTech Research | Year: 2014

The nano crystalline Ni0.8Zn0.2Fe2O4powder was prepared by co-precipitation method and deposited on alumina substrate by screen printing method. The powder was characterized by XRD, FT-IR and SEM techniques. The XRD study shows the cubic spinel structure. The crystallite size is 26.32nm. The FT-IR spectrum shows two absorption bands near 400cm-1 and 600cm-1 corresponding to tetrahedral and octahedral sites respectively. The SEM study shows irregular shape grainsand average size is 0.85μm. The ferrite thick films show higher sensitivity to Cl2than ethanol and LPG at room temperature.

Langer H.,KRP - Mechatec Engineering GbR | Steinbicker A.,KRP - Mechatec Engineering GbR | Meister H.,Max Planck Institute for Plasma Physics (Garching) | Zauner C.,KRP - Mechatec Engineering GbR
Fusion Engineering and Design | Year: 2015

The thermal design of diagnostic components for the ITER bolometer diagnostic is of critical importance with respect to survivability, reliability and performance. To support the development of bolometer camera prototypes for ITER, KRP-M has performed the thermal analysis to determine the temperature distribution, to identify critical items and uncertainties, and to optimize the camera design to achieve low detector temperatures. The analysis has been carried out in close interaction with tests for reducing the uncertainties of those parameters responsible for the highest variations in the results and for verifying the simulation model. Special tests have been designed and performed by KRP-M for determining emissivity and thermal contact conductivity parameters. For a prototype of the bolometer camera, a thermal balance test has been designed and used to verify the FE model. © 2015 Elsevier B.V. All rights reserved.

Kim B.Y.,National Fusion Research Institute | Ahn H.J.,National Fusion Research Institute | Bak J.S.,National Fusion Research Institute | Choi C.H.,ITER Organization | And 2 more authors.
Fusion Engineering and Design | Year: 2012

The ITER vacuum vessel gravity supports located in the lower level shall sustain loads in radial, toroidal and vertical directions. The hinge type VVGS consists of two hinges, upper and lower blocks and dowels. In order to develop the design concept and verify the structural integrity of the hinge system, the design analysis has been performed in detail. Inclination of 15° for the hinge based supporting system was introduced to provide centering force to make stable equilibrium state of the vacuum vessel. Due to this inclination the hinges are rotated by the radial expansion of the VV during operation and baking, respectively. If a dowel is seized in the hinge, the supporting system can be highly stressed due to the restrained displacement in the seized dowel. Therefore, solid lubricant coatings were suggested on dowels in order to avoid seizing in the sliding area. In this work, several sets of coupons were made with different coating materials to investigate the effect according to the selection of coating material. Also, a test facility was designed to cover the ITER relevant loading and boundary conditions, e.g. vacuum condition, temperature, contact pressure, cycles, etc. From those test results, the optimized coating method was found to avoid seizure of dowel in the ITER VVGS. © 2012 Elsevier B.V.

Meister H.,Max Planck Institute for Plasma Physics (Garching) | Kannamuller M.,Max Planck Institute for Plasma Physics (Garching) | Koll J.,Max Planck Institute for Plasma Physics (Garching) | Pathak A.,Max Planck Institute for Plasma Physics (Garching) | And 5 more authors.
Review of Scientific Instruments | Year: 2012

The first detector prototypes for the ITER bolometer diagnostic featuring a 12.5 μm thick Pt-absorber have been realized and characterized in laboratory tests. The results show linear dependencies of the calibration parameters and are in line with measurements of prototypes with thinner absorbers. However, thermal cycling tests up to 450°C of the prototypes with thick absorbers demonstrated that their reliability at these elevated operating temperatures is not yet sufficient. Profilometer measurements showed a deflection of the membrane hinting to stresses due to the deposition processes of the absorber. Finite element analysis (FEA) managed to reproduce the deflection and identified the highest stresses in the membrane in the region around the corners of the absorber. FEA was further used to identify changes in the geometry of the absorber with a positive impact on the intrinsic stresses of the membrane. However, further improvements are still necessary. © 2012 Euratom.

Agostinetti P.,Consorzio RFX | Palma M.D.,Consorzio RFX | Bello S.D.,Consorzio RFX | Heinemann B.,Max Planck Institute for Plasma Physics (Garching) | And 4 more authors.
Journal of Nuclear Materials | Year: 2011

The optimal behaviour of copper as heat sink material makes it suitable for many components of nuclear fusion devices subjected to cyclic heat loads with high power densities. In particular, this material is considered for several water cooled components for the ITER Neutral Beam Injector, like the ion source and the acceleration grids. The electro-deposition technique permits to obtain complex geometric shapes (with small cooling channels and embedded magnets) and to have good mechanical properties at the same time, due to the high purity and to the very small grain size. Consequently, the thermo-mechanical properties of electro-deposited pure copper are considered as a crucial aspect for the design of the new generation fusion experimental devices. This paper presents an exhaustive test campaign aimed at investigating the properties of this material. © 2011 EURATOM. Published by Elsevier B.V. All rights reserved.

Christoph Z.,KRP - Mechatec Engineering GbR | Reindl M.,KRP - Mechatec Engineering GbR | Robin L.B.,ITER Organization | Choi C.H.,ITER Organization | Ahn H.J.,National Fusion Research Institute
Fusion Engineering and Design | Year: 2014

The ITER vacuum vessel support structure is composed of nine circumferentially distributed hinges which have to comply with the gravity and multi-axial disruption loads in the MN range but also allow a radial expansion of the vacuum vessel during bake-out and operation. In a first test campaign under thermal vacuum conditions (200 °C, 1e-6 mbar) and under a load of up to 770 kN the coating and material for the hinges have been selected. A 1/3rd downscaled Mock Up has been designed, analyzed by FEM and manufactured. First tests to verify the gravity load (1.7 MN) and radial expansion (simulated by rotation of the dowel) have been performed successfully. Now a two-axis load test for verifying the most significant VDE loading is going to be performed. For this high load mechanical tests, a special test rig has been developed with a capability of 5 MN vertical and 2 MN toroidal loads. © 2014 Elsevier B.V.

Zauner C.,KRP - Mechatec Engineering GbR | Klammer J.,KRP - Mechatec Engineering GbR | Hartl M.,Kayser Threde GmbH | Kampf D.,Kayser Threde GmbH | And 5 more authors.
Fusion Engineering and Design | Year: 2013

Considering multi-physics requirements and loads in the early design phase as well as during the later experimental verification is especially important for the design of fusion devices due to the extreme environmental conditions and loads. Typical disciplines in design of fusion devices are thermodynamics, structural-mechanics, electro-magnetics, and optics. The interaction of these disciplines as well as an efficient approach to implement this interaction in numerical and experimental simulations is presented as applied at the new JET KL11 divertor endoscope design and verification process. The endoscope's first pictures already showed the very good performance of the instrument. © 2013 Elsevier B.V. All rights reserved.

Meister H.,Max Planck Institute for Plasma Physics (Garching) | Langer H.,KRP - Mechatec Engineering GbR | Schmitt S.,Fraunhofer Institute for Chemical Technology
Fusion Engineering and Design | Year: 2016

Bolometer sensors are a key component to determine the total radiation and the radiation profile in fusion devices. For future devices like ITER the need arose to develop new sensors in order to adapt to loads, in particular neutron irradiation and enhanced thermal loads. The method proposed here to deal effectively with the stresses in the absorber and its supporting membrane is to support the absorber by flexure hinges, thus allowing deformations in all dimensions and reducing stresses. First, a design for the flexure hinges is proposed. Then finite-element analyses (FEA) have been carried out to investigate expected deformations due to residual stresses from the manufacturing process as well as due to additional thermal loads at 450. °C. The results showed stress levels below the expected tensile strength of Si. In addition, calculations show that the proposed design is expected to provide acceptable cooling time constants. Thus, prototypes based on the proposed design have been manufactured. Measurements of their deformation at room temperature are in agreement with predictions from FEA. Also, all prototypes were successfully subjected to thermal cycling up to 450. °C without any failures, thus demonstrating a successful development. However, for future application as bolometer sensor, a change in calibration parameters is expected: a factor of five for the heat capacity and a factor of two for the cooling time constant. Further prototypes including meanders and electrical contacts need to be developed and tested to finally validate if flexure hinges are a viable means for bolometer sensors at high operating temperatures. © 2016.

Krodel M.,ECM Engineered Ceramic Materials GmbH | Zauner C.,KRP - Mechatec Engineering GbR
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

During the past years, ECM together with its industrial partners designed, manufactured and tested several complex light weighted structures of its proprietary ceramic material €HB-Cesic. The opto-mechanical structures have fulfilled extreme stability requirements under typical non stabilized space environment. In this paper we report from a recent example of such extremely thermal stable structure as well as about some heritage structures for similar applications. © 2015 SPIE.

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