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Ageing studies since June 2006

Detailed analyses and comparisons of radiation damage patterns and outgassing results at NIKHEF and HD facilities since June 2006, showcasing agreement and differences in damage profiles. Investigating the effects of oxygen flushing and gas flow variations on ageing rates.

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Ageing studies since June 2006

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  1. Ageing studies since June 2006 Comparisons HD – NIKHEF damage, patterns, analyses Oxygen results Outgassing

  2. 55Fe Comparison NIKHEF – HD Agreement? HD NIKHEF

  3. Compare large area irradiation • HD: 9 keV X ray, radius ~50cm, 140 hrs, 50 nA (1520V): 80% damage • NI: 2mCu 90Sr, radius ~30cm, 14 hrs, 50 nA (1600V): 10% damage • Both: damage upstream, • Both: more damage in the center of the module gas

  4. Check region channel 1-10 • 3 measurements • Before irradiation • After irradiation • Rescan Ratio 2/1 Ratio 3/1 Ratio 3/2 ok lowish Conclusion: • Measurement 2 is suspiciously low around ch1-10 • The damaged area worsened from 0.3 to 0.25

  5. Single wire • Disconnected all wire, but wire 32. • Conclusion: • Ageing occurs independent of neighbors • Possibly can use a simple test module of 1 straw to investigate materials • Spots at 20, 40, 50 cm unclear…

  6. 55Fe Comparison NIKHEF – HD Agreement? HD NIKHEF

  7. 90Sr Comparison NIKHEF - HD Agreement? HD NIKHEF

  8. Analysis Comparison NIKHEF - HD Irradiation: 22hrs Ratio of gain NIKHEF analysis HD analysis Different definition of rings

  9. Analysis Comparison NIKHEF - HD Irradiation: 30hrs Ratio of gain NIKHEF analysis HD analysis Different definition of rings

  10. Small current 22 hrs, 125 nA 90Sr (test16) • Conditions: • Flow: Ar/CO2 20 l/hr • 1600V, 70/30, 90Sr • 22 hrs, 125 nA ~ 10mC • 166hrs, 2.5 nA ~ 1.5mC • Conclusions: • Maximum damage at small currents 166 hrs, 2.5 nA 90Sr Current profile:

  11. Flush with Oxygen: Ar/CO2/O2 70/27.5/2.5 • Conditions: • 1600V, 90Sr • Ar/CO2 70/30 20 l/hr • Ar/CO2/O2 70/27.5/2.5 10 l/hr • Conclusions: • With oxygen slower ageing • NB. Gas flow is lower… 22 hrs, Ar/CO2 70/30 (test16) 66 hrs, Ar/CO2/O2 70/27.5/2.5 (test16) Current profile

  12. Flush with Oxygen 68 hr @13cm Gas flow • Conditions: • Flow: Ar/CO2/O2 10 l/hr • 2mCu, 90Sr source Conclusions: • Oxygen ages slowly 68 hr @13cm 22 hr @23cm 68 hr @13cm 46 hr @23cm Compare to result from Heidelberg: 90 hr @13cm 46 hr @23cm

  13. Flush with Oxygen,vary gas flow Ar/CO2 70/30, 46hrs, 20 l/hr • Conditions: • Flow: Ar/CO2/O2 70/27.5/2.5 % • 2mCu, 90Sr source, 68 hrs Conclusions: • Oxygen ages slower by factor 3 • Larger flow, larger ageing 10 l/hr 20 l/hr

  14. Did oxygen flushing prevent ageing? After oxygen flushing, irradiated 16 hrs: • Test to prevent ageing • Conditions: • Flow: Ar/CO2 20 l/hr • 2mCu, 90Sr source on module surface, 16 hours • Conclusions: • Ageing as usual. • Irradiation after oxygen flushing does not prevent ageing gas U L No oxygen flushing, irradiated 22 hrs: Ratio Zoom

  15. Long term? Outgassing? 3B (30) - 12/4/2006 – 15hr 3B (7) - 18/1/2006 - 15hr • Conditions: • Flow: Ar/CO2 70/30 20 l/hr • January: in cleanroom • Feb – now: in lab • 2mCu, 90Sr source 3A (3) - 15/4/2006 – 23hr 3B (17) - 23/2/2006 - 15hr 3B (28) - 21/3/2006 – 21.5hr 3A (19) - 23/5/2006 – 22hr

  16. Long term?Outgassing? • Conditions: • Flow: Ar/CO2 70/30 20 l/hr • January: in cleanroom • Feb – now: in lab • 2mCu, 90Sr source 3A (3) - 15/4/2006 – 23hr 3B (7) - 18/1/2006 - 15hr 3B (17) - 23/2/2006 - 15hr 3A (19) - 23/5/2006 – 22hr 3B (28) - 21/3/2006 – 21.5hr 3A (27) - 19/6/2006 – 16hr 3A (29) - 15/8/2006 – 20hr 3B (30) - 12/4/2006 – 15hr

  17. Damage vs Time(module 3) • Conditions: • Flow: Ar/CO2 70/30 20 l/hr • 2mCu, 90Sr source • January: in cleanroom • Feb – now: in lab • Flushed for 140 days • ~65,000 liter gas normalization? 15hr 16hr careful... Also the ‘tape region’ is integrated here! 15hr 16hr • Point 4,7 is a bit strange: • Only 15,16 hrs of irradiation • More damage

  18. Ageing (22hr) before vacuum treatment Put 1m-module 1day, 6days under vacuum • Conditions: • Flow: Ar/CO2 70/30 • 2mCu, 90Sr source Conclusions: • Forced outgassing in vacuum helps?? Ageing (19hr) after vacuum treatment Ageing (19hr) after 6 days vacuum treatment Ageing (18hr) additional 50hrs flushing Note different scale!

  19. Irradiating after reversing gas flow • Conditions: • Flow: Ar/CO2 70/30 • 2mCu, 90Sr source Conclusions: • Reversing gas flow makes little recovery Gas flow 84 hrs irradiation Netto effect: Gas flow 91 hrs irradiation

  20. Additional damage after flushing?No irradiation! • Conditions: • Flow: Ar/CO2 70/30 • 2mCu, 90Sr source • Flush for 20 days at 20 l/hr between July 26 and August 15 Conclusions: • Additional damage after flushing Ratio of scans from Aug15 / Jul26 Original damage from irradiation:

  21. Different F-module: 002Test effect of fast flushing • Conditions: • Flow: Ar/CO2 70/30 % • 2mCu, 90Sr source~20hrs • Flushing: • 140 l/hr • Total 21,000 l of N2 Conclusions: • Flushing helps • gas flow not important Ageing (19hr) before flushing Ageing (19hr) after 7,400 l flushing Ageing (21hr) after 21,000 l flushing

  22. Damage vs TimeIrradiation profiles • Conditions: • Flow: Ar/CO2 70/30 20 l/hr • 2mCu, 90Sr source • Between 22Jun and Jul27: Flushed with N2 with 140 l/hr

  23. Improvement with Time Jun 22 • Conditions: • Flow: Ar/CO2 20 l/hr • 2mCu, 90Sr source • Between 22Jun and Jul27: • Flushed with N2 with 140 l/hr Jun 28 Jul 4 Jul 27 Aug 28 Aug 15

  24. Damage vs TimeCompare mod 2 and mod 3 • Conclusions: • Module 2 improves faster than module 3 3rd: 10% longer irr Compare to result from Heidelberg: Module 63 36.2 m3 100 days

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