may’02, trt workshop jack fowler – duke university sem analysis of wire from aging test #7 at...
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![Page 1: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/1.jpg)
May’02, TRT WorkshopJack Fowler – Duke University
SEM Analysis of Wire from Aging Test #7 at
Duke University Jack Fowler
![Page 2: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/2.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Module Test Layout
![Page 3: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/3.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Duke Wire Samples Analyzed
Xe-CO2 gas volume Wire 14 – Production wire with glass joint
Xe-CF4-CO2 gas volume Wire 19 - Production wire with glass encapsulated joint Wire 20 - Production wire with polyimide joint Wire 22 - Production wire with no joint Wire 23 - Production wire with PEEK joint Wire 31 – Pre-series wire with no wire joint
None of the wires shown were cleaned prior to installation into chamber
Wire analysis Performed at Analytical Instrumentation Facility at North Carolina State University
![Page 4: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/4.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 14 Glass Wire Joint
Gas Volume - Xe-CO2
Current - 14.8 A Charge ~ 2.5 to 3.0 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Light deposits of Na and
Cl
![Page 5: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/5.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 19 Glass Encapsulated Wire joint
Gas Volume - Xe-CO2 -CF4
Current - 16.6 A Charge ~ 2.4 to 2.9 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Few deposits
![Page 6: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/6.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Polyimide Wire Joint
Gas Volume - Xe-CO2 -CF4
Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr No visible change
![Page 7: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/7.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 14 Segment 4
Gas Volume - Xe-CO2
Glass Wire Joint Current - 14.8 A Charge ~ 2.5 to 3.0 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr No deposits
![Page 8: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/8.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 14 Segment 5
Gas Volume - Xe-CO2
Glass Wire Joint Current - 14.8 A Charge ~ 2.5 to 3.0 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr
![Page 9: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/9.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 14 Segment 5
Gas Volume - Xe-CO2
Glass Wire Joint Current - 14.8 A Charge ~ 2.5 to 3.0 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Fine Deposits are Na and
Cl
![Page 10: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/10.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 19 Segment 4
Gas Volume - Xe-CO2 -CF4
Glass Encap Wire Joint Current - 16.6 A Charge ~ 2.4 to 2.9 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores Gold etching and removal
![Page 11: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/11.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 19 Segment 4
Gas Volume - Xe-CO2 -CF4
Glass Encap Wire Joint Current - 16.6 A Charge ~ 2.4 to 2.9 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~ 15cc/hr Large pores Gold etching and removal Notice the loss of surface
definition and grain boundaries
![Page 12: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/12.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 19 Segment 5
Gas Volume - Xe-CO2 -CF4
Glass Encap Wire Joint Current - 16.6 A Charge ~ 2.4 to 2.9 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores Gold etching and removal
![Page 13: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/13.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 19 Segment 5
Gas Volume - Xe-CO2 -CF4
Glass Encap Wire Joint Current - 16.6 A Charge ~ 2.4 to 2.9 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores Gold etching and removal
![Page 14: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/14.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores Gold etching and removal
![Page 15: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/15.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores Gold etching and removal Again loss of surface
definition
![Page 16: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/16.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Area show at 2 kV beam
energy
![Page 17: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/17.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 5
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Surface is covered with
deposits
![Page 18: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/18.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 5
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Pores in surface Faint grain boundaries still
present Deposits are mainly Au
![Page 19: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/19.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Discolored region near
wire joint ~700 m
![Page 20: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/20.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Here is the section where
the transition occurs
![Page 21: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/21.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 20 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Very heavy gold damage This affect was seen on
both sides of the wire joint.
![Page 22: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/22.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 22 Segment 4
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~ 15cc/hr Large pores Notice large regions where
it appears that gold surface is uneven, possibly islands removed
![Page 23: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/23.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 22 Segment 4
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores All surfaces appear in the
same condition
![Page 24: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/24.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 22 Segment 5
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores and islands
![Page 25: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/25.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 22 Segment 5
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current - 15.4 A Charge ~ 2.3 to 2.7 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores
![Page 26: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/26.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 23 Segment 3
Gas Volume - Xe-CO2 -CF4
PEEK Wire Joint Current - 7.4 A Charge ~ 0.8 to 1.0C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Fine deposits Grain definition is reduced
![Page 27: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/27.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 23 Segment 3
Gas Volume - Xe-CO2 -CF4
PEEK Wire Joint Current - 7.4 A Charge ~ 0.8 to 1.0C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Fine deposits Grain definition is reduced
![Page 28: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/28.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 23 Segment 4
Gas Volume - Xe-CO2 -CF4
PEEK Wire Joint Current - 7.4 A Charge ~ 0.8 to 1.0C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Fine deposits Grain definition is reduced
![Page 29: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/29.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 23 Segment 5
Gas Volume - Xe-CO2 -CF4
PEEK Wire Joint Current - 7.4 A Charge ~ 0.8 to 1.0C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Fine deposits Grain definition is reduced
![Page 30: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/30.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 31 Segment 4
Wire - thin plated preseries
Gas Volume - Xe-CO2 -CF4
Current - 8.9 A Charge ~ 1.2 to 1.5 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Large pores Heavy gold damage
![Page 31: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/31.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 31 Segment 7
Wire - thin plated preseries
This region was visibly darkened during removal
Gas Volume - Xe-CO2 -CF4
Current - 8.9 A Charge ~ 1.2 to 1.5 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Small deposits
![Page 32: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/32.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Wire 31 Segment 7
Wire - thin plated preseries
This region was visibly darkened during removal
Gas Volume - Xe-CO2 -CF4
Current - 8.9 A Charge ~ 1.2 to 1.5 C/cm Exposed Time ~ 1680 hrs Target Flow Rate ~
15cc/hr Small deposits of F
![Page 33: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/33.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire Samples Analyzed
Xe-CO2 gas volume Wire 2 – Production wire with polyimide joint
Xe-CF4-CO2 gas volume Wire 18 - Production wire with no joint Wire 19 - Production wire with polyimide joint Wire 39 - Production wire with polyimide joint
None of the wires shown were cleaned prior to installation into chamber
Wire analysis Performed at Analytical Instrumentation Facility at North Carolina State University
![Page 34: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/34.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 2 Segment 1
Gas Volume - Xe-CO2
Polyimide Wire Joint Current – 1.4 A Charge ~ 3.3 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr C deposits
![Page 35: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/35.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 2 Segment 1
Gas Volume - Xe-CO2
Polyimide Wire Joint Current – 1.4 A Charge ~ 3.3 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr C deposits and Pores Fine white deposits
![Page 36: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/36.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 2 Segment 4
Gas Volume – Xe-CO2
Polyimide Wire Joint Current – 1.4 A Charge ~ 3.3 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr C deposits
![Page 37: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/37.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 2 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.4 A Charge ~ 3.3 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr Few pores Good surface grain
definition
![Page 38: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/38.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 2 Segment 7
Gas Volume - Xe-CO2
Polyimide Wire Joint Current – 1.4 A Charge ~ 3.3 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr More C deposits than in
earlier segments
![Page 39: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/39.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 2 Segment 7
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.4 A Charge ~ 3.3 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr More C deposits than in
earlier segments Loss of grain definition
from segment 4
![Page 40: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/40.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 18 Segment 4
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current – 1.7A Charge ~ 2.4 C/cm Exposed Time – 408 hrs Target Flow Rate ~15
cc/hr Large C deposits
![Page 41: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/41.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 18 Segment 5
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current – 1.7A Charge ~ 2.4 C/cm Exposed Time – 408 hrs Target Flow Rate ~15
cc/hr Large C deposits Some large pores
![Page 42: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/42.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 18 Segment 5
Gas Volume - Xe-CO2 -CF4
No Wire Joint Current – 1.7A Charge ~ 2.4 C/cm Exposed Time – 408 hrs Target Flow Rate ~15
cc/hr Some loss of grain
definition
![Page 43: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/43.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 19 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.0 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr C deposits Some small pores Surface is smoother than
wire 18
![Page 44: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/44.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 19 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.0 C/cm Exposed Time – 672 hrs Target Flow Rate ~15 cc/hr Slight decrease in grain
definition Some small pores
![Page 45: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/45.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 19 Segment 5
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~4.0 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr Surface has many small C
deposits Some porosity
![Page 46: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/46.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 19 Segment 5
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.0 C/cm Exposed Time – 672 hrs Target Flow Rate ~15
cc/hr Small pores around grain
boundaries Some porosity
![Page 47: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/47.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 39 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.9 C/cm Exposed Time – 816 hrs Target Flow Rate ~15
cc/hr Surface smooth in
appearance Many large C deposits
![Page 48: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/48.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 39 Segment 4
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.9 C/cm Exposed Time – 816 hrs Target Flow Rate ~15
cc/hr Many C deposits Loss of grain definition
![Page 49: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/49.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 39 Segment 5
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.9 C/cm Exposed Time – 816 hrs Target Flow Rate ~15
cc/hr Surface smooth in
appearance Large C deposits
![Page 50: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/50.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
IU Wire 39 Segment 5
Gas Volume - Xe-CO2 -CF4
Polyimide Wire Joint Current – 1.7A Charge ~ 4.9 C/cm Exposed Time – 816 hrs Target Flow Rate ~15
cc/hr Surface is smoother Less grain definition C deposits
![Page 51: May’02, TRT Workshop Jack Fowler – Duke University SEM Analysis of Wire from Aging Test #7 at Duke University Jack Fowler](https://reader035.vdocument.in/reader035/viewer/2022062807/5697c02c1a28abf838cd8e06/html5/thumbnails/51.jpg)
May’02, TRT WorkshopJack Fowler, Duke HEP
Summary
It is clear that the wire is damaged in Duke wires and the surface has changed in Indiana wires
Wire damage may be more a function of time exposed to gas as opposed to the amount of accumulated charge
Duke wires have > double the exposure time IU wires have higher accumulated charge
Xe-CO2 wire only exhibit small pores on surface
Xe-CF4-CO2 wires show some heavy damage, both Au removal and deposits
There is trace fluorine detected on the surface of the wire