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

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Presentation transcript:

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

TPC C.M C. Garabatos, GSI Darmstadt2 Tested materials MaterialS/F (h/cm)mC/cmResult Tedlar 1 (*)0.33.2OK Araldit OK Araldit DP OK Araldit OK Araldit OK Tedlar 2 (*)2.24.3OK (*) ALICE: 34 h/cm

TPC C.M C. Garabatos, GSI Darmstadt3

TPC C.M C. Garabatos, GSI Darmstadt4 Ne-CO 2 [90-10] Gain ~

TPC C.M C. Garabatos, GSI Darmstadt5 Gain with P10

TPC C.M C. Garabatos, GSI Darmstadt6 First ageing test: ended with Malter breakdown

TPC C.M C. Garabatos, GSI Darmstadt7 Second ageing test: ended with Malter breakdown

TPC C.M C. Garabatos, GSI Darmstadt8 Characterization of the Rate of ageing

TPC C.M C. Garabatos, GSI Darmstadt9 Rate of ageing in ALICE with P10

TPC C.M C. Garabatos, GSI Darmstadt10 Estimation of rates and doses BOEdN/dYSec. track length (cm) wire length (cm) # of wires wire pitch (cm) Ne (cm -1 )Gain Trig. rate (Hz) ALICE 8000x STAR 650x Method charge density (C) current (nA/cm) dose (mC/cm) ALICE Marek Max. (TDR) 0.5  /20cm in 10 yr ALICE Marek Sector 3.0  /sector in 10 yr ALICE BOE Sector 1.0  /sector in 10 yr STAR BOE Sector.0002  /sector *.035* in 3 months * Scale by factor 5

TPC C.M C. Garabatos, GSI Darmstadt11 Ageing predictions

TPC C.M C. Garabatos, GSI Darmstadt12 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