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Ageing Tests of Materials for ALICE Conditions: Insights and Conclusions

This report details the ageing tests conducted on various materials used in the ALICE detector, including assessments under methane extrapolation conditions. Initial and secondary ageing tests revealed significant issues, particularly with materials exposed to methane, which demonstrated rapid degradation. The study estimated ageing rates and doses, indicating that while most tested materials are expected to perform well in the ALICE TPC, methane poses severe risks of breakdown within the first year. Future tests will investigate vacuum grease for O-rings to ensure safety and longevity.

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Ageing Tests of Materials for ALICE Conditions: Insights and Conclusions

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  1. AGEING STUDIES C. Garabatos, GSI Material tests update Ageing tests with Methane Extrapolation to ALICE conditions Extrapolation to STAR conditions

  2. Tested materials (*) ALICE: 34 h/cm C. Garabatos, GSI Darmstadt

  3. C. Garabatos, GSI Darmstadt

  4. Ne-CO2 [90-10] Gain ~ 24 000 C. Garabatos, GSI Darmstadt

  5. Gain with P10 C. Garabatos, GSI Darmstadt

  6. First ageing test:ended with Malter breakdown C. Garabatos, GSI Darmstadt

  7. Second ageing test:ended with Malter breakdown C. Garabatos, GSI Darmstadt

  8. Characterization of the Rate of ageing C. Garabatos, GSI Darmstadt

  9. Rate of ageing in ALICE with P10 C. Garabatos, GSI Darmstadt

  10. Estimation of rates and doses * Scale by factor 5 C. Garabatos, GSI Darmstadt

  11. Ageing predictions C. Garabatos, GSI Darmstadt

  12. Conclusions • Materials tested so far are most probably fine for the ALICE TPC • Methane is out of the question • It produces severe ageing well within the time scale of ALICE • IROCs would breakdown in the first year • Methane is a safety nightmare • Next test: Vacuum grease for O-rings C. Garabatos, GSI Darmstadt

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