Irradiation Tests Module 3B

1
Irradiation Tests Module 3B
Irradiate small area 2x2 cm2, with 2 mCu 90Sr, 2
cm distance (200 nA)
NB gas flow from Upper to Lower
Source profile
Gas flow

• Many tests, see last slide for overview

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

NB Remarkably, the humidity of the module did
not increase between 2004 and 2006 !
3
VI Module 3B 90Sr scan before and after 1st
irradiation
Module irradiated at 486 cm from lower end
4
VI Module 3B 90Sr scan before and after 1st
irradiation
After irradiation
Before irradiation
Ratio Irr/Non-irr
Source position 484cm
5
VI Module 3B 90Sr scan before and after 2nd
irradiation
Module irradiated at 462 cm from lower end
6
VI Module 3B 90Sr scan before and after 2nd
irradiation
After irradiation
Before irradiation
Ratio Irr/Non-irr
Source position 462cm
7
VI Module 3B 90Sr scan before and after 3rd
irradiation L-side
Module irradiated at 23 cm from lower end
8
VI Module 3B 90Sr scan before and after 3rd
irradiation L-side
After irradiation
Before irradiation
Ratio Irr/Non-irr
Source position 20cm
9
VI Module 3B 5th irradiation upper side,
around straw 32 60 hours
Source profile (linear)
Source profile (logar.)
10
VI Module 3B 90Sr scan before and after 5th
irradiation 60 hours
Module irradiated at 430 cm from lower end
11
VI Module 3B 90Sr scan before and after 5th
irradiation 60 hours
After irradiation
Before irradiation
Ratio Irr/Non-irr
Source position 430cm
12
VI Module 3B 90Sr scan before and after 6th
irradiation

• By accident gas flow off
• Irradiated
• 4 hours with HV
• 8 hours without HV

• Used 2 sources
• Source collimated circular at 442 cm
• Source collimated with slit at 475 cm (used for
  90Sr scans)

Point collimated
Slit collimated
13
VI Module 3B 90Sr scan before and after 6th
irradiation No gas flow!
After 6th irradiation
!
Before 6th irradiation
Ratio Irr/Non-irr

• Point collimated 442 cm
• effect is circular, as expected
• Slit collimated 475 cm
• gain increased!?
• No gas flow
• Only 4 hrs at HV1600V

Source positions 442cm and 475 cm
14
VI Module 3B 7th irradiation upper side,
around straw 32 20 l/hr
Source profile (linear)
Source profile (logar.)
15
VI Module 3B 90Sr scan before and after 7th
irradiation 20 l/hr
Gas flow 20 l/hr Source at 390 cm Irradiated 15
hours
16
VI Module 3B 90Sr scan before and after 7th
irradiation 20 l/hr
After 7th irradiation
Before 7th irradiation
Ratio Irr/Non-irr

• Gas flow 20 l/hr

Source positions 390cm
17
VI Module 3B 8th irradiation upper side,
around straw 32 2.5 l/hr
Source profile (linear)
Source profile (logar.)
18
VI Module 3B 90Sr scan before and after 8th
irradiation 2.5 l/hr
Gas flow 2.5 l/hr Source at 375 cm Irradiated 15
hours
19
VI Module 3B 90Sr scan before and after 8th
irradiation 2.5 l/hr
After 8th irradiation
Before 8th irradiation
Ratio Irr/Non-irr

• Gas flow 2.5 l/hr

Source positions 375 cm
20
VI Module 3B 90Sr scan before and after 9th
irradiation 2 sources
Gas flow 10 l/hr 2 sources ? Does the 1st
source eats the pollutions?? Irradiated 15 hours

• Used 2 sources
• Source collimated circular at 340 cm
• Source collimated with slit at 360 cm (used for
  90Sr scans)

21
VI Module 3B 90Sr scan before and after 9th
irradiation 2 sources
After 9th irradiation
Before 9th irradiation
Ratio Irr/Non-irr

• Two sources

Source positions 340 and 460 cm
22
VI Module 3B 90Sr scan before and after 10th
irradiation dryer??
Gas flow 20 l/hr Source at 310 cm Irradiated 15
hours
Humidity on output Tdew -43 oC ? lt200 ppm
Wire locator
23
VI Module 3B 90Sr scan before and after 10th
irradiation dryer??
After 8th irradiation
Before 8th irradiation
Ratio Irr/Non-irr

• Gas flow 20 l/hr
• Humidity lt200 ppm

Source positions 310 cm
24
VI Module 3B 11th irradiation upper side,
around straw 32 dry 20-30 ppm
Source profile (linear)
Source profile (logar.)
25
VI Module 3B 90Sr scan before and after 11th
irradiation dry 20-30 ppm
Gas flow 20 l/hr Source at 415 cm Irradiated 15
hours
Humidity on output Tdew -51 oC ? 20-30 ppm
26
VI Module 3B 90Sr scan before and after 11th
irradiation dry 20-30 ppm
After 8th irradiation
Before 8th irradiation
Ratio Irr/Non-irr

• Gas flow 20 l/hr
• Humidity 20-30 ppm

Source positions 415 cm
27
Humidity
29 Jan
23 Jan
28
Conclusions
Gas flow
Test 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, lt100nA/straw Collimator point 58 484 10 12 - -20
2 10 Jan 2mCu, lt100nA/straw Collimator point 58 462 10 8 - -10
3 11 Jan 2mCu, lt100nA/straw Collimator point 54 20 10 12 - -50
4 12 Jan 2mCu, lt100nA/straw Collimator point 58 430 10 15 - -20
5 13 Jan 2mCu, lt100nA/straw Collimator point 32 430 10 60 - -80
6 17 Jan 2mCu, lt100nA/straw Collimator point 32 440 0 4 - -10
20mCu, lt100nA/straw Collimator slit 32 475 0 4 - -5 2.5
7 18 jan 2mCu, lt100nA/straw Collimator point 32 390 20 15 1000 -50
8 19 Jan 2mCu, lt100nA/straw Collimator point 32 375 2.5 15 - -10
9 20 Jan 2mCu, lt100nA/straw Collimator point 32 340 10 14 - -5-10 (downstream)
20mCu, lt100nA/straw Collimator slit 32 360 10 14 - -20 (upstream)
10 24 jan 2mCu, lt100nA/straw Collimator point 32 310 20 15 lt200 -50
11 28 jan 2mCu, lt100nA/straw Collimator point 32 415 20 15 20-30 -50