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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: - PowerPoint PPT Presentation
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9 Jan 2006 1
Ageing History 2005Niels, Gras, Eduard & Sebastian
18 January 2006Test Mod Wire Date Source Current/
strawDuration Tests 90Sr Scans
I 002A 24L 20-31 May 2005
2 mCu 90Srcollimated
~3 nA 11 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
II 123B All Upper (usual profile)
21,22 Nov 2005
20 mCu 90Sr <150 nA N hours at 15 cm from upper end
Flow test, ageing by accident
19,24 Nov
III 1009A
All Upper (usual profile)
18,23 Nov2005
20 mCu 90Sr <150 nA 4 days at 15 cm from upper end
With/withoutOil bubbler
25 Oct, 17 Nov
IV 002A All Upper (usual profile)
24,26 Nov 2005
20 mCu 90Sr <150 nA 2 days at 15 cm from upper end
With/withoutOil bubbler
28 Nov
V 123B 11-18UpperHD
Dec 2005 55Fe? <100 nA 144 hours at 20 cm from upper end
Repeat in HD Tested with 55Fe
9 Jan 2006 2
I: Module 002: Setup
• One 5 m OT modules
• Gas : Ar/CO2 70/30NIKHEF
Experimental Hall
LHCb Week at CERN, wednesday 8 June 2005. Eduard Simioni, NIKHEF Amsterdam.
Sr90 source
Module #2Wire 24A
Scintillator
(2.3 MeV)
Wire 24AAnalog Out.
Wire 24ADigital 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 2006 3
I: Module 002 90Sr scan after irradiation
Neighbor:Straw 23
Neighbor:Straw 25
Irradiated:Straw 24
9 Jan 2006 4
II: Module 123B during irradiation: Gas Mixture
studies
Total: 105 s=28 hourAr/CO2 68/32: zoom next page
Source profile
9 Jan 2006 5
II: Module 123B during irradiation: Ar/CO2 68/32
interpolated
Source profile
9 Jan 2006 6
II: Module 123B 90Sr scan before and after
irradiationModule irradiated at 16.4 cm from upper end (~476 cm from lower end)
9 Jan 2006 7
II: Module 123B 90Sr scan before and after
irradiation
After irradiation:
Before irradiation:
Ratio: Irr/Non-irr:
Source position: 474cmDamage upstream
9 Jan 2006 8
Oil bubbler: various setups
Module
Module
Original setup during routine 90Sr scans
“Oil” setup with large oil contamination
Module “No Oil” setup
Safety bubbler
Water bubblerto see gas flow
Oil bubbler to increase pollution
9 Jan 2006 9
III: Module 1009ADuring irradiation
Module 1009: 1meter long test moduleVaried the gas flow
No ageing observed after 150 hours at 150 nAOf which 50 hours through oil bubbler with 2 l/hr
No 90Sr scan done after the irradiation
17-23 Nov 2005
9 Jan 2006 10
III: Module 1009A during beginning of irradiation: 17
Nov
9 Jan 2006 11
III: Module 1009A during end of irradiation: 23 Nov
No ageing during 5 days!!
9 Jan 2006 12
IV: Module 2ADuring irradiation
No ageing observed after 20 hours at 150 nAthrough oil bubbler with 2 l/hr
24, 25 Nov 2005
9 Jan 2006 13
IV: Module 2A during beginning of irradiation: 24
Nov
9 Jan 2006 14
IV: Module 2A during end of irradiation: 25 Nov
No ageing during 2 days??
9 Jan 2006 15
IV: Module 2A 90Sr scan before and after
irradiationModule irradiated at 5 cm from upper end (~486 cm from lower end)
???
9 Jan 2006 16
IV: Module 2A 90Sr scan before and after
irradiation
After irradiation:
Before irradiation:
Ratio: Irr/Non-irr:
Source position: 484cmDamage upstream??
9 Jan 2006 17
V: Module 123Set-up for testing module 123
Gasbottle
Lowerside
Upperside
Gas in: 20mstainless stell
Exhaust: 1m SS+ ~20m plastic
Irradiatedarea
Referencearea
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
Panel ID: FP306B
1) Irradiated lower side2) Flushed for many ideas3) Irradiated upper side
9 Jan 2006 18
V: Module 123Irradiation on LOWER side
9 Jan 2006 19
V: Module 123BIrradiation upper side
Measurements before irradiation
Beam profile Amplitude
9 Jan 2006 20
V: Evolution during irradiation
9 Jan 2006 21
V: Evolution during irradiation
Ratio of signal amplitude: Irradiated/not irradiate
9 Jan 2006 22
V: Wire scans after irradiation (1):
Irradiated spot in Hd Irradiated spot at Nikhef
9 Jan 2006 23
V: Wire scans after irradiation (2):
9 Jan 2006 24
V: Module 123Conclusions from HD
Gasbottle
Lowerside
Upperside
Gas in: 20mstainless stell
Exhaust: 1m SS+ ~20m plastic
Irradiatedarea
Referencearea
Panel ID: FP306B
Ageing observed in irradiated area
after 144hr at ~100 nAon upper side
NO Ageing observed in irradiatedarea after 144hr at ~100 nAon lower side??
9 Jan 2006 25
Conclusions & Plans
• Module 1009A (1m module) not understood. recheck
• Module 2A: irradiated too close to the upper edge to draw conclusions