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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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Reliability issues for a bolometer detector for ITER at high operating temperatures.

H Meister1, M Kannamüller, J Koll

  • 1Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany. meister@ipp.mpg.de

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|November 7, 2012
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Summary
This summary is machine-generated.

New ITER bolometer detector prototypes with thick platinum absorbers show promise but require further development. Thermal cycling tests revealed reliability issues at high temperatures, necessitating design improvements to mitigate membrane stress.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Diagnostics
  • Materials Science

Background:

  • The International Thermonuclear Experimental Reactor (ITER) requires advanced diagnostics for plasma monitoring.
  • Bolometers are crucial for measuring plasma radiation and power balance.
  • Detector prototypes with thicker platinum (Pt) absorbers were developed for enhanced performance.

Purpose of the Study:

  • To characterize the performance and reliability of new ITER bolometer detector prototypes.
  • To investigate the impact of thick Pt absorbers on detector calibration and thermal stability.
  • To identify and address sources of stress and potential failure mechanisms in the detector membranes.

Main Methods:

  • Laboratory characterization of detector prototypes, including calibration parameter analysis.
  • Thermal cycling tests up to 450 °C to assess high-temperature reliability.
  • Profilometry measurements to detect membrane deformation.
  • Finite Element Analysis (FEA) to model stress distribution and identify areas for geometric optimization.

Main Results:

  • Calibration parameters demonstrated linear dependencies, consistent with thinner absorber prototypes.
  • Prototypes with thick Pt absorbers exhibited insufficient reliability during thermal cycling to 450 °C.
  • Profilometry and FEA revealed significant membrane stress, particularly around absorber corners, caused by deposition processes.
  • FEA simulations suggested geometric modifications to reduce intrinsic membrane stress.

Conclusions:

  • While initial calibration is promising, the reliability of thick Pt-absorber bolometer prototypes at ITER operating temperatures remains a challenge.
  • Internal stresses induced during absorber deposition significantly impact membrane integrity.
  • Further geometric optimization and material process improvements are essential for developing robust bolometer detectors for ITER.