Skip to main content

Mechanical Resilience

Vibration testing of mechanical resilience of bolometer sensors and sensor holders under ITER-relevant conditions


The ITER bolometer diagnostic will provide the measurement of the total radiation emitted from the plasma, a part of the overall energy balance. Up to 550 sensor channels will be installed in ITER in 71 cameras of various sizes and types. The sensor holder is the component inside those cameras to provide attachment and signal connections to the sensor itself. A design of a sensor holder has been proposed previously based on ceramic front and back plates with wire bonded contacts to the sensor and welded signal cables.

This concept can provide the reliable electrical connections required for ITER at temperatures up to 350 C and had been prototyped and proven to be manufacturable. In order to verify its resilience against mechanical loads as well as that of the sensors, sensor holder assemblies have been subjected to accelerations on a shaking table. The magnitude of the accelerations applied (in the frequency range from 5 Hz up to 1 kHz) have been deduced based on load definitions from ITER describing the floor response spectra for typical seismic events as well as the ones expected during disruptions due to electro-magnetically induced forces in bolometer cameras and port structures within which they are mounted.

A particular focus has been placed on testing whether it is beneficial to cover the bond wires with a ceramic paste to protect them against fatigue breaks due to vibrations. The tests demonstrated that the chosen sensor assembly is well capable of withstanding all applied loads without failures and thus demonstrating its structural integrity during the expected operations. Within the limited number of load cycles no need to apply the ceramic paste could be identified.

The ITER bolometer diagnostic shall provide the measurement of the total radiation emitted from the plasma, a part of the overall energy balance. Up to 550 sensor channels will be installed in ITER in up to 71 cameras of various sizes and types. The sensor holder is the component inside all those cameras that provides attachment and signal connections to the sensor itself. It might vary in shape within each camera, but concepts for implementing signal connections and handling of loads in all cameras are very similar, if not identical.

A design of a sensor holder has been proposed previously based on ceramic front and back plates with wire bonded contacts to the sensor and welded signal cables. This concept can provide the reliable electrical connections required for ITER at temperatures up to 350 C and had been prototyped and proven to be manufacturable. In order to verify the resilience of this design as well as that of prototype sensors against mechanical loads, a set of sensor holder assemblies have been manufactured and subjected to accelerations on a shaking table. The previous results from identified a high risk of breaking bond wires during thermal cycling in case a ceramic paste is applied to protect them against vibrations. Accordingly, a particular focus was placed in the current tests to compare the behaviour under mechanical loads with and without ceramic paste.

mechanical resilience, material strength, stress resistance, fracture toughness, fatigue resistance, elastic modulus, impact strength, load bearing capacity, ductility, hardness, durability, tensile strength, compressive strength, shear strength, toughness, plastic deformation, structural integrity, resilience engineering, high performance materials, advanced composites

#MechanicalResilience, #MaterialStrength, #StressResistance, #FractureToughness, #FatigueResistance, #ElasticModulus, #ImpactStrength, #LoadBearingCapacity, #Ductility, #Hardness, #Durability, #TensileStrength, #CompressiveStrength, #ShearStrength, #Toughness, #PlasticDeformation, #StructuralIntegrity, #ResilienceEngineering, #HighPerformanceMaterials, #AdvancedComposites

Comments

Post a Comment

Popular posts from this blog

Global Lighthouse Network

Smart, sustainable manufacturing: 3 lessons from the Global Lighthouse Network Launched in 2018, when more than 70% of factories struggled to scale digital transformation beyond isolated pilots, the Global Lighthouse Network set out to identify the world’s most advanced production sites and create a shared learning journey to up-level the global manufacturing community. In the past seven years, the network has grown from 16 to 201 industrial sites in more than 30 countries and 35 sectors, including the latest cohort of 13 new sites. This growing community of organizations is setting new standards for operational excellence, leveraging advanced technologies to drive growth, productivity, resilience and environmental sustainability. But what exactly is a Global Lighthouse and what has the network achieved? What is the Global Lighthouse Network? The Global Lighthouse Network is a community of operational facilities and value chains that harness digital technologies at scale to ac...
Post a Comment
Read more
 How Network Polarization Shapes Our Politics! Network polarization amplifies political divisions by clustering like-minded individuals into echo chambers, where opposing views are rarely encountered. This reinforces biases, reduces dialogue, and deepens ideological rifts. Social media algorithms further intensify this divide, shaping public opinion and influencing political behavior in increasingly polarized and fragmented societies. Network polarization refers to the phenomenon where social networks—both offline and online—become ideologically homogenous, clustering individuals with similar political beliefs together. This segregation leads to the formation of echo chambers , where people are primarily exposed to information that reinforces their existing views and are shielded from opposing perspectives. In political contexts, such polarization has profound consequences: Reinforcement of Biases : When individuals only interact with like-minded peers, their existing beliefs bec...
Post a Comment
Read more

Quantum Network Nodes

An operating system for executing applications on quantum network nodes The goal of future quantum networks is to enable new internet applications that are impossible to achieve using only classical communication . Up to now, demonstrations of quantum network applications  and functionalities   on quantum processors have been performed in ad hoc software that was specific to the experimental setup, programmed to perform one single task (the application experiment) directly into low-level control devices using expertise in experimental physics.  Here we report on the design and implementation of an architecture capable of executing quantum network applications on quantum processors in platform-independent high-level software. We demonstrate the capability of the architecture to execute applications in high-level software by implementing it as a quantum network operating system-QNodeOS-and executing test programs, including a delegated computation from a client to a server ...
Post a Comment
Read more