19 Oct 2006 1

NIKHEF update

3 lines of attack: 1) Heating (Mod 30)

• 3 days at 45 C, 4 days at 48 C• Q1: Change in geometry, gas tightness,

gain?• Q2: Effect on ageing?

2) Flushing (Mod 2)• Improves rapidly, but suddenly worse• Q: why??

3) HV training (Mod 3)• Damage reappears after 200 hrs• Q: 200hrs of irradiation, or time constant?

19 Oct 2006 2

1) Heating Mod 30Setup

19 Oct 2006 3

1) Heating Mod 30Temperature: 1st heating 3

daysProcedure1) Module 30 is heated

while flushing with CO2

2) One day at 35C3) 3 days at 48 C4) 4 days at 48 C

Logbook

22-29Sep Measure dimension, gas tightness

29Sep 35C 1 day

29Sep-2 Oct

48C 3 days

2-4 Oct Measure dimension, gas tightness

4 Oct Flush 24 hrs, then irradiate

6-10 Oct 48C >4 days

10 Oct Measure dimension, gas tightness

10 Oct Flush 24 hrs, then irradiate

Sep29

Oct 2

19 Oct 2006 4

1) Heating Mod 30Temperature: 2nd heating 4

daysProcedure1) Module 30 is heated

while flushing with CO2

2) One day at 35C3) 3 days at 48 C4) 4 days at 48 C

Logbook

22-29Sep Measure dimension, gas tightness

29Sep 35C 1 day

29Sep-2 Oct

48C 3 days

2-4 Oct Measure dimension, gas tightness

4 Oct Flush 24 hrs, then irradiate

6-10 Oct 48C >4 days

10 Oct Measure dimension, gas tightness

10 Oct Flush 24 hrs, then irradiate

Oct 5

Oct 6

19 Oct 2006 5

1) Heating Mod 30Geometry: Flatness

Flatness:• Module is flat to +/- 200 μm• Change after heating <100 μm

33.0

33.5

34.0

34.5

35.0

0 1 2 3 4 5 6 7 8

Y (sticker)

Z (

mm

) Row III

Row II

Row I

33.0

33.5

34.0

34.5

35.0

0 1 2 3 4 5 6 7 8

Y (sticker)

Z (

mm

) Row III

Row II

Row I

Before After

Row III II I

19 Oct 2006 6

1) Heating Mod 30Geometry: Length

Length:• Module shrinked by 1.03±0.10mm• Module shrinked by additional 0.38±0.10mm

These shifts are easily seen by eye…

Date a b Average (a+b)/2Nominal: 2.46mm

Delta

22Sep

3.69 2.88 3.28 +0.82

25Sep

3.55 3.21 3.38 +0.92

3 Oct 2.74 2.03 2.38 -0.08

5 Oct 2.27 2.16 2.21 -0.25

10 Oct

2.30 1.55 1.92 -0.54

12.92mm

8.0mma

b

moduletable

a+b/2

19 Oct 2006 7

1) Heating Mod 30Geometry: Width

Width:• Module shrinked by 100 μm +/- 50

μm

Average width of module

339.40

339.50

339.60

339.70

339.80

339.90

340.00

340.10

340.20

340.30

1 2 3 4 5 6 7

sticker number

wid

th (

mm

)

19 Oct 2006 8

1) Heating Mod 30Geometry: Shape

Before

After Consistency check of decreased width:~ -100μm

Shape:• Straight within +/-100μm

19 Oct 2006 9

1) Heating Mod 30Gas Tightness

Before

1st heating

2nd heating

Date Leakage Flow (l/s)

22Sep

1.5 10-5

25Sep

1.1 10-5

3 Oct 2.8 10-5

5 Oct 0.4 10-5

10 Oct

4.0 10-5

10 Oct

1.8 10-5Gas tightness:• OK, Unchanged: 1.5 10-5 l/s ± 1.5 10-5 l/s• Corresponding to 0.007mb/min

19 Oct 2006 10

1) Heating Mod 30

Ageing

Sep 4, after 6 days of flushing

Sep 19, after HV training

Oct 4, after 3 days at 48 C

Ageing:• No sign of improvement

after 3+4 days at 48 C!• Module became very noisy??

Oct 11, after 3+4 days at 48 C

Scan after

Scan before

19 Oct 2006 11

Conclusions:

• Module 30 follows initial pattern from mod 2• What happened with module 2 ??

Briefly opened when moved from setup to setup Gas had finished before worsening of module 2 Flushing is only temporary benificial !? similar for heating??

2) Long term flushing

Module 63

36.2 m3

Compare to result from Heidelberg:

100 days

M002 ?!?

Heating of M030!?

19 Oct 2006 12

2) Long term flushingdips in Module 3?

History: 21Mar – 12Apr:

28Mar-11Apr: opened module15Apr – 23May:

25Apr-10May: played with water bottle10May-15May: module not connected

23May – 19Jun: 6Jun: Change Ar bottle 6Jun – 19 Jun: Addition of O2

19Jun-15Aug20Jun-14Jul: module not connected

Mod

Date Loc I(nA)

Time (hrs)

1 3B 18Jan cleanroom

190 15

2 3B 23Feb

Lab 150 15

3 3B 21Mar

Lab 150 21.5

4 3B 12Apr

Lab 150 15

5 3A 15Apr

Lab 180 23

6 3A 23May

Lab 140 22

7 3A 19Jun Lab 150 16

8 3A 15Aug

Lab 150 2028Mar: opened moduleduring 14days

10May: opened moduleduring 5days

6Jun: flushed with 4% O2 for 13days

20Jun: opened moduleduring 24days

19 Oct 2006 13

3) HV trainingGas flow

Conditions: Flow: Ar/CO2 70/30, 20 l/hr Irradiation: 2mCu, 90Sr source Sequence:

1) HV training ~40 hrs 1870 and 1920V2) Irradiate 340 hrs3) HV training 18 hrs 1910 V

Conclusions: A second HV training helps again

340 hrs

After HV

After HV

Lower?

2nd HV training

1st HV training

NB: 700 hrs ~ 2.5 106 s ~ 3 months nominal LHC

340+350 hrs

Rel

.gai

n

3rd HV training

Lower??

19 Oct 2006 14

3) HV trainingQuestion:1) Does it prevent ageing during 200 hrs of irradiation2) Or does it prevent ageing for 200 hrs of flushing… It looks like 1) But untrained part improves!?

2nd HV training

1st HV training

3rd HV training

8 days of flushing

3 days of flushing

??

Gain indeed went upRatio 10Oct/3 Oct:

3Oct

29Sep-3Oct

10Oct

19 Oct 2006 15

3) HV training

Question:• Is ageing also prevented at previously

unirradiated spots (pos. 190cm) ? Marginally…

• This seems in contradiction with measurements of Aug 20 on unirradiated spot (pos. 200cm)

20hrs

96hrs

Deepest point Integrated loss over surface

19 Oct 2006 16

1) Heating Mod 30: high currents cured?

• After heating: many channels with high current1) Loose wire tension? (shorter module?) 2) Loose wire tension? (loose soldering?)3) Deformation of straw?4) Humidity in module?5) Broken feedthrough board?

• After additional 3 days of flushing: high currents disappeared!

Scan after heating:

Scan after heating and additional 3 days of flushing:

19 Oct 2006 17

Development of Currents: ch1; the side

19 Oct 2006 18

Development of Currents: ch64; the side

19 Oct 2006 19

Development of Currents: ch33; irradiated

19 Oct 2006 20

Development of Currents: ch27; ?

19 Oct 2006 21

1) Heating Mod 30

Ageing

Sep 4, after 6 days of flushing

Sep 19, after HV training

Oct 4, after 3 days at 48 C

Ageing:• No sign of improvement

after 3+4 days at 48 C!• Module became very noisy??

Oct 11, after 3+4 days at 48 C

Oct 16, 7days heating +4days flushing

19 Oct 2006 22

Ageing after Heating+Flushing

Ageing:• No sign of improvement

after 3+4 days at 48 C• Some improvement after

flushing, but is it more than expected? Slope is nicely steep But is there a factor 5?

3+4 days heating+4 days flushing

3+4 days heating

(heated module)

19 Oct 2006 23

A closer look: compare(using deepest point definition)

3+4 days heating+4 days flushing

3+4 days heating

Conclusion?

11 days heating+3 days flushing

Heidelberg

17 days heating

19 Oct 2006 24

A closer look: compare using HD definition

3+4 days heating+4 days flushing

3+4 days heating

• HD: ~90hrs 55Fe• NI: ~20hrs 90Sr

Conclusion?Is there a steeper slope

when we heat?

11 days heating+3 days flushing

Heidelberg

17 days heating

19 Oct 2006 25

Summary HD – NIKHEF data

• HD: ~90hrs 55Fe• Mod 20 and Mod 7 heated• Mod 7: 186 hr irradiation!

• NI: ~20hrs 90Sr

Mod 20+7 have steeper slope??

NB: Mod 7 2x the irradiation

Mod 7

• Mod 20Mod 20

19 Oct 2006 26

3.2m Module: an oldy…

• What is the 3.2m module? Construction date: 2001 Used in 2001 testbeam for TDR Straws glued to panels with

Araldite or Stycast??

• 16 channels connected

LHCb-2001-098

19 Oct 2006 27

Irradiating 3.2m Mod

20 hrs

20+22 hrs

23 hrs

118 hrsGas flow

• Two irradiations, 2 mCu 44 hrs 118 hrs

very little damage

164 hrs

19 Oct 2006 28

Irradiation 3.2m Mod

very little damage 3.2m: 15% after 200hrs Mod3: 35% after 200hrs

• Progressing in time• Independent of definition

Compare to F-mod 3:

3.2 m module (2001):