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