TRD Production at GSI Joerg Hehner TRD Collaboration Meeting Bucharest

Overview Joerg Hehner TRD Collaboration Meeting Bucharest Status L5C1/L4C1 - Glue System - Testing the Properties - Summary

30 Radiators Frames glued 21 Radiator Frames wired 23 Padplanes glued 2 Padplanes bad Joerg Hehner TRD Collaboration Meeting Bucharest Production Status L5C1

19 Moduls tested with Fe55 Source Closed with Tape Gas ArCO 2 70/30 HV-Anode 1620 V, HV-Drift V O 2 Concentration below 30ppm, Flush 40l/h, 8h up to know Dark Current < 1nA Joerg Hehner TRD Collaboration Meeting Bucharest Testing Status L5C1

Finally glued Chamber 2 Modul tested with Roentgen Source Gas ArCO 2 70/30 HV-Anode 1620 V, HV-Drift V O 2 Concentration below 10ppm, Flush 40l/h, 8h up to know Dark Current < 1nA Joerg Hehner TRD Collaboration Meeting Bucharest Testing Status L5C1

11 Radiators Frames glued 5 Radiator Frames wired 5 Padplanes glued Joerg Hehner TRD Collaboration Meeting Bucharest Production Status L4C1

1 Moduls tested with Fe55 Source Closed with Tape Gas ArCO 2 70/30 HV-Anode 1620 V, HV-Drift V O 2 Concentration below 30ppm, Flush 40l/h, 8h up to know Dark Current < 1nA Joerg Hehner TRD Collaboration Meeting Bucharest Testing Status L4C1

Problem with Glue System Joerg Hehner TRD Collaboration Meeting Bucharest Used Araldit AW 106/AW116 with Hardener HV953U - Sticky surface after curing time - Problem in Producing Hardener HV 953 U since 2004

Decision Joerg Hehner TRD Collaboration Meeting Bucharest Stop the TRD Production Mechanical and electrical Properties Chemical Composition was changed - Get a Charge of an modifcated Hardener to test the mech. and electr. Properties

Test mechanical Properties Joerg Hehner TRD Collaboration Meeting Bucharest cured Glue min. 24h under different climatic Conditions Shore Hardness is 60 - Observed Different Surface Quality, it depends on the Huminidity and the retention time in Air Humidity rel. 2% - 50% Temperature 23 º C – 40 º C one Sample cured in Nitrogen Atmosphere

Test Electrical Properties Joerg Hehner TRD Collaboration Meeting Bucharest under different Climatic Conditions Volume Resistivity 300 G – 8 T Ohm cm Humidity rel. 2% - 50% Temperature 23 º C – 40 º C one Sample has cured in Nitrogen Atmosphere

CONCLUSION Joerg Hehner TRD Collaboration Meeting Bucharest Orderd and distributed Hardener to finished the TRD Production - Additional Ageing Test

SUMMARY Joerg Hehner TRD Collaboration Meeting Bucharest Delay of 6 weeks in the Production Scale - 4 L5C1and 4 L4C1 finished to shipped to HD End of October - Production Mode to build 2 TRD Chambers / 7 Working Days

Joerg Hehner TRD Collaboration Meeting Bucharest Thank you Sandra Schwab, Anja B. Steffen Gert Augustinski, Andre Radu, Heinz W. Daues and all the Students