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Meister H, Kannamüller M, Koll J, et al. Reliability issues for a bolometer detector for ITER at high operating temperatures. Rev Sci Instrum. 2012;83(10):10D724doi: 10.1063/1.4740256.
Meister, H., Kannamüller, M., Koll, J., Pathak, A., Penzel, F., Trautmann, T., Detemple, P., Schmitt, S., & Langer, H. (2012). Reliability issues for a bolometer detector for ITER at high operating temperatures. The Review of scientific instruments, 83(10), 10D724. https://doi.org/10.1063/1.4740256
Meister, H, et al. "Reliability issues for a bolometer detector for ITER at high operating temperatures." The Review of scientific instruments vol. 83,10 (2012): 10D724. doi: https://doi.org/10.1063/1.4740256
Meister H, Kannamüller M, Koll J, Pathak A, Penzel F, Trautmann T, Detemple P, Schmitt S, Langer H. Reliability issues for a bolometer detector for ITER at high operating temperatures. Rev Sci Instrum. 2012 Oct;83(10):10D724. doi: 10.1063/1.4740256. PMID: 23126898.
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Rev Sci Instrum. 2012 Oct;83(10):10D724. doi: 10.1063/1.4740256.

Reliability issues for a bolometer detector for ITER at high operating temperatures.

The Review of scientific instruments

H Meister, M Kannamüller, J Koll, A Pathak, F Penzel, T Trautmann, P Detemple, S Schmitt, H Langer

Affiliations

  1. Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching, Germany. [email protected]

PMID: 23126898 DOI: 10.1063/1.4740256

Abstract

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.

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