irradiation tests module 3b

9 Jan 2006 1

Irradiation Tests Module 3B

Many tests, see last slide for overview

Irradiate small area: 2x2 cm2, with 2 mCu 90Sr, 2 cm distance (~200 nA)

Source profile

NB: gas flow from Upper to Lower

Position1 485cm

L-wire 64

ULGas flow

9 Jan 2006 2

History Module 3• Construction:

12 May 2004

• Flushed with Ar/CO2, 10 l/hr: 9 June 2006 – 29 June 2004

• (Humidity of gas on input : Tdew=-76 0C, 17 June 2004)• 18 June 2004: Tdew=-22 0C• 22 June 2004: Tdew=-33 0C• 29 June 2004: Tdew=-35 0C

Total gas flow ~4800 liter

• Medium Scale Test: flushed in C-frame, 76 l/hr (7 modules) 7 April 2005 – End of May ~7500 liter

• Flushed with Ar/CO2, 10 l/hr (2.5 – 20): 6 Jan 2006 – present

• Date Time Tmitchell Tcorrected H20 content(ppm)• 23-1-2006 18h28 -38 -35.5 212.3• 24-1-2006 9h26 -41 -37.89 163.4• 24-1-2006 18h25 -41 -37.89 163.4• 25-1-2006 -43.8 -41.00 115.6• 26-1-2006 16h26 -48 -45.66 67.1

~5000 liter

NB: Remarkably, the humidity of the module did not increase between 2004 and 2006 !

9 Jan 2006 3

VI: Module 3B 90Sr scan before and after 1st

irradiationModule irradiated at 486 cm from lower end

9 Jan 2006 4

VI: Module 3B 90Sr scan before and after 1st

irradiation

After irradiation:

Before irradiation:

Ratio: Irr/Non-irr:

Source position: 484cm

9 Jan 2006 5

VI: Module 3B 90Sr scan before and after 2nd

irradiationModule irradiated at 462 cm from lower end

9 Jan 2006 6

VI: Module 3B 90Sr scan before and after 2nd

irradiation

After irradiation:

Before irradiation:

Ratio: Irr/Non-irr:


9 Jan 2006 7

VI: Module 3B 90Sr scan before and after 3rd irradiation L-

sideModule irradiated at 23 cm from lower end

9 Jan 2006 8

VI: Module 3B 90Sr scan before and after 3rd irradiation:

L-side

After irradiation:

Before irradiation:

Ratio: Irr/Non-irr:


9 Jan 2006 9

VI: Module 3B 5th irradiation: upper side, around straw 32 60

hoursSource profile (linear): Source profile (logar.):

9 Jan 2006 10

VI: Module 3B 90Sr scan before and after 5th irradiation 60

hoursModule irradiated at 430 cm from lower end

9 Jan 2006 11

VI: Module 3B 90Sr scan before and after 5th irradiation: 60

hours

After irradiation:

Before irradiation:

Ratio: Irr/Non-irr:


9 Jan 2006 12

VI: Module 3B 90Sr scan before and after 6th

irradiationBy accident gas flow: off…Irradiated 4 hours with HV8 hours without HV

Used 2 sourcesSource collimated circular at 442 cmSource collimated with slit at 475 cm (used for 90Sr scans)

Point collimated Slit collimated

9 Jan 2006 13

VI: Module 3B 90Sr scan before and after 6th irradiation: No gas

flow!

After 6th irradiation:

Before 6th irradiation:

Ratio: Irr/Non-irr:

Source positions: 442cm and 475 cm

Point collimated: 442 cm• effect is circular, as expected

Slit collimated: 475 cm• gain increased!?

No gas flowOnly 4 hrs at HV=1600V

!

9 Jan 2006 14

VI: Module 3B 7th irradiation: upper side, around straw 32

20 l/hrSource profile (linear): Source profile (logar.):

9 Jan 2006 15

VI: Module 3B 90Sr scan before and after 7th irradiation 20

l/hrGas flow: 20 l/hrSource at 390 cmIrradiated 15 hours

9 Jan 2006 16

VI: Module 3B 90Sr scan before and after 7th irradiation: 20 l/hr



Ratio: Irr/Non-irr:

Source positions: 390cm

Gas flow: 20 l/hr

9 Jan 2006 17

VI: Module 3B 8th irradiation: upper side, around straw 32 2.5

l/hrSource profile (linear): Source profile (logar.):

9 Jan 2006 18

VI: Module 3B 90Sr scan before and after 8th irradiation 2.5

l/hrGas flow: 2.5 l/hrSource at 375 cmIrradiated 15 hours

9 Jan 2006 19

VI: Module 3B 90Sr scan before and after 8th irradiation: 2.5 l/hr



Ratio: Irr/Non-irr:

Source positions: 375 cm

Gas flow: 2.5 l/hr

9 Jan 2006 20

VI: Module 3B 90Sr scan before and after 9th irradiation 2 sourcesGas flow: 10 l/hr2 sources Does the 1st source eats the pollutions??Irradiated 15 hours

Used 2 sourcesSource collimated circular at 340 cmSource collimated with slit at 360 cm (used for 90Sr scans)

9 Jan 2006 21

VI: Module 3B 90Sr scan before and after 9th irradiation: 2

sources



Ratio: Irr/Non-irr:

Source positions: 340 and 460 cm

Two sources:

9 Jan 2006 22

VI: Module 3B 90Sr scan before and after 10th irradiation

dryer??Gas flow: 20 l/hrSource at 310 cmIrradiated 15 hours

Wire locator

Humidity on output: Tdew= -43 oC <200 ppm

9 Jan 2006 23

VI: Module 3B 90Sr scan before and after 10th irradiation:

dryer??



Ratio: Irr/Non-irr:


Gas flow: 20 l/hrHumidity: <200 ppm

9 Jan 2006 24

VI: Module 3B 11th irradiation: upper side, around straw 32 dry: 20-30

ppmSource profile (linear): Source profile (logar.):

9 Jan 2006 25

VI: Module 3B 90Sr scan before and after 11th irradiation dry: 20-

30 ppmGas flow: 20 l/hrSource at 415 cmIrradiated 15 hours

Humidity on output: Tdew= -51 oC 20-30 ppm

9 Jan 2006 26

VI: Module 3B 90Sr scan before and after 11th irradiation: dry: 20-30 ppm



Ratio: Irr/Non-irr:


Gas flow: 20 l/hrHumidity: 20-30 ppm

9 Jan 2006 27

Humidity

23 Jan

29 Jan

9 Jan 2006 28

ConclusionsTest

Date

Source 90Sr L-Wire w. max current

Position(cm)

Gas flow(l/hr)

Irradiation Time (hr)

Humidity(ppm)

Max gain drop

1 6 Jan 2mCu, <100nA/strawCollimator: point

58 484 10 12 - -20%

2 10 Jan

2mCu, <100nA/strawCollimator: point

58 462 10 8 - -10%

3 11 Jan


54 20 10 12 - -50%

4 12 Jan


58 430 10 15 - -20%

5 13 Jan


32 430 10 60 - -80%

6 17 Jan


32 440 0 4 - -10%

20mCu, <100nA/strawCollimator: slit

32 475 0 4 - -5% +2.5%

7 18 jan


32 390 20 15 ~1000 -50%

8 19 Jan


32 375 2.5 15 - -10%

9 20 Jan


32 340 10 14 - -5-10% (downstream)

20mCu, <100nA/strawCollimator: slit

32 360 10 14 - -20% (upstream)

10 24 jan


32 310 20 15 <200 -50%

11 28 jan


32 415 20 15 20-30 -50%

Position1 485cm

L-wire 64

ULGas flow

irradiation tests module 3b

Documents

irradiation tests module

irradiationafter irradiation

sideafter irradiation

hoursafter irradiation

lowergas flowhistory

source profile logar

source positions

ctotal gas flow