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Ageing History 2005

Ageing History 2005. Niels, Gras, Eduard & Sebastian 18 January 2006. NIKHEF Experimental Hall. I: Module 002: Setup. Scintillator. Sr 90 b source. b (2.3 MeV). Module #2 Wire 24A. Wire 24A Analog Out. Wire 24A Digital Out. Irradiated from 20 May until 31 May almost day and night:

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Ageing History 2005

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  1. Ageing History 2005 Niels, Gras, Eduard & Sebastian 18 January 2006

  2. NIKHEF Experimental Hall I: Module 002: Setup Scintillator Sr90b source b (2.3 MeV) Module #2 Wire 24A Wire 24A Analog Out. Wire 24A Digital Out. • Irradiated from 20 May until 31 May almost day and night: • about 50% of time on the top, (240 cm by FE) • about 20% of time at 120 cm. • about 20% at 20 cm • about 10% in other position • One 5 m OT modules • Gas : Ar/CO2 70/30 LHCb Week at CERN, wednesday 8 June 2005. Eduard Simioni, NIKHEF Amsterdam.

  3. I: Module 002 90Sr scan after irradiation Neighbor: Straw 23 Irradiated: Straw 24 Neighbor: Straw 25

  4. II: Module 123B during irradiation: Gas Mixture studies Source profile Ar/CO2 68/32: zoom next page Total: 105 s=28 hour

  5. II: Module 123B during irradiation: Ar/CO2 68/32 Source profile interpolated

  6. II: Module 123B90Sr scan before and after irradiation Module irradiated at 16.4 cm from upper end (~476 cm from lower end)

  7. II: Module 123B90Sr scan before and after irradiation After irradiation: Before irradiation: Ratio: Irr/Non-irr: Damage upstream Source position: 474cm

  8. Oil bubbler: various setups Module Original setup during routine 90Sr scans Safety bubbler Module “No Oil” setup Water bubbler to see gas flow Module “Oil” setup with large oil contamination Oil bubbler to increase pollution

  9. III: Module 1009ADuring irradiation Module 1009: 1meter long test module Varied the gas flow 17-23 Nov 2005 • No ageing observed after 150 hours at 150 nA Of which 50 hours through oil bubbler with 2 l/hr No 90Sr scan done after the irradiation

  10. III: Module 1009A during beginning of irradiation: 17 Nov

  11. III: Module 1009A during end of irradiation: 23 Nov No ageing during 5 days!!

  12. IV: Module 2ADuring irradiation 24, 25 Nov 2005 • No ageing observed after 20 hours at 150 nA through oil bubbler with 2 l/hr

  13. IV: Module 2A during beginning of irradiation: 24 Nov

  14. IV: Module 2A during end of irradiation: 25 Nov No ageing during 2 days??

  15. IV: Module 2A90Sr scan before and after irradiation Module irradiated at 5 cm from upper end (~486 cm from lower end) ???

  16. IV: Module 2A90Sr scan before and after irradiation After irradiation: Before irradiation: Ratio: Irr/Non-irr: Damage upstream?? Source position: 484cm

  17. V: Module 123Set-up for testing module 123 Gas in: 20m stainless stell • Parameters: • Total irradiated area: ~25cm2 • Source: 55Fe • Voltage 1600V • Total current: ~400nA • Current in hottest straw: ~100nA • Total duration of irradiation: • 144h • Total integrated charge: ~200mC • Integrated charge in hottest straw: • ~50mC Gas bottle Upper side Irradiated area Reference area Panel ID: FP306B • Irradiated lower side • Flushed for many ideas • Irradiated upper side Lower side Exhaust: 1m SS + ~20m plastic

  18. V: Module 123Irradiation on LOWER side

  19. V: Module 123BIrradiation upper sideMeasurements before irradiation Beam profile Amplitude

  20. V: Evolution during irradiation

  21. V: Evolution during irradiation Ratio of signal amplitude: Irradiated/not irradiate

  22. V: Wire scans after irradiation (1): Irradiated spot at Nikhef Irradiated spot in Hd

  23. V: Wire scans after irradiation (2):

  24. V: Module 123Conclusions from HD Gas in: 20m stainless stell Gas bottle Upper side Irradiated area Reference area Ageing observed in irradiated area after 144hr at ~100 nA on upper side Panel ID: FP306B NO Ageing observed in irradiated area after 144hr at ~100 nA on lower side?? Lower side Exhaust: 1m SS + ~20m plastic

  25. Conclusions & Plans • Module 1009A (1m module) not understood. •  recheck • Module 2A: irradiated too close to the upper edge to draw conclusions

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