9 Jan Ageing History 2005 Niels, Gras, Eduard & Sebastian 18 January 2006 TestModWireDateSourceCurrent/st raw DurationTests 90 Sr Scans I002A24L20-31 May mCu 90 Sr collimated ~3 nA11 days, of which 5 days very close middle print, 3 days at 120 cm, 3 days at 20 cm Rate test, ageing by accident 6,13 Jun II123BAll Upper (usual profile) 21,22 Nov mCu 90 Sr<150 nAN hours at 15 cm from upper end Flow test, ageing by accident 19,24 Nov III1009AAll Upper (usual profile) 18,23 Nov mCu 90 Sr<150 nA4 days at 15 cm from upper end With/without Oil bubbler 25 Oct, 17 Nov IV002AAll Upper (usual profile) 24,26 Nov mCu 90 Sr<150 nA2 days at 15 cm from upper end With/without Oil bubbler 28 Nov V123B11-18 Upper HD Dec Fe?<100 nA144 hours at 20 cm from upper end Repeat in HDTested with 55 Fe

9 Jan I: Module 002: Setup One 5 m OT modules Gas : Ar/CO 2 70/30 NIKHEF Experimental Hall LHCb Week at CERN, wednesday 8 June Eduard Simioni, NIKHEF Amsterdam. Sr 90  source Module #2 Wire 24A Scintillator  (2.3 MeV) 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

9 Jan I: Module Sr scan after irradiation Neighbor: Straw 23 Neighbor: Straw 25 Irradiated: Straw 24

9 Jan II: Module 123B during irradiation: Gas Mixture studies Total: 10 5 s=28 hour Ar/CO2 68/32: zoom next page Source profile

9 Jan II: Module 123B during irradiation: Ar/CO2 68/32 interpolated Source profile

9 Jan II: Module 123B 90 Sr scan before and after irradiation Module irradiated at 16.4 cm from upper end (~476 cm from lower end)

9 Jan II: Module 123B 90 Sr scan before and after irradiation After irradiation: Before irradiation: Ratio: Irr/Non-irr: Source position: 474cm Damage upstream

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

9 Jan III: Module 1009A During irradiation Module 1009: 1meter long test module Varied the gas flow  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 Nov 2005

9 Jan III: Module 1009A during beginning of irradiation: 17 Nov

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

9 Jan IV: Module 2A During irradiation  No ageing observed after 20 hours at 150 nA through oil bubbler with 2 l/hr 24, 25 Nov 2005

9 Jan IV: Module 2A during beginning of irradiation: 24 Nov

9 Jan IV: Module 2A during end of irradiation: 25 Nov No ageing during 2 days??

9 Jan IV: Module 2A 90 Sr scan before and after irradiation Module irradiated at 5 cm from upper end (~486 cm from lower end) ???

9 Jan IV: Module 2A 90 Sr scan before and after irradiation After irradiation: Before irradiation: Ratio: Irr/Non-irr: Source position: 484cm Damage upstream??

9 Jan V: Module 123 Set-up for testing module 123 Gas bottle Lower side Upper side Gas in: 20m stainless stell Exhaust: 1m SS + ~20m plastic Irradiated area Reference area Parameters: - Total irradiated area: ~25cm 2 - Source: 55 Fe - 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 Panel ID: FP306B 1)Irradiated lower side 2)Flushed for many ideas 3)Irradiated upper side

9 Jan V: Module 123 Irradiation on LOWER side

9 Jan V: Module 123B Irradiation upper side Measurements before irradiation Beam profile Amplitude

9 Jan V: Evolution during irradiation

9 Jan V: Evolution during irradiation Ratio of signal amplitude: Irradiated/not irradiate

9 Jan V: Wire scans after irradiation (1): Irradiated spot in Hd Irradiated spot at Nikhef

9 Jan V: Wire scans after irradiation (2):

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

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