H. Felice and all 1

Collar Pack #2 Disassembly IncidentSummary and Plan

Helene FeliceHeng Pan, Dan Cheng, Xiaorong Wang, Soren Prestemon, Maxim Martchevsky,

Ahmet Pekedis, Matt Reynolds, Daryl Horler, Jason Duponte, Tom Lipton, Jordan Taylor

07/13/2015

H. Felice and all 2

• On 07/07/2015• During the collar pack #2 disassembly an incident happened:

• The upper coils shifted and collapsed

• Preliminary assessment immediately after incident • No one was injured• No assembly tooling were damaged• All collar stacks are intact.

07/13/2015

H. Felice and all 3

• Normal setup

• During the incident• The center coil support spud was not in place;• The technicians were removing the side collar pack, the steel angle block

was released

Context of the incident

Steel Angle block

Coil support spud

Assembly Table Assembly Table

Return End Return End

1- Disassemble the top collar stack 2 -Disassemble the collar stack #2

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H. Felice and all 4

Incident sequence

Return end view• Coil 104 fell onto the assembly table, • Coil 3 fell into coil 5• Red circles indicate the edge of the coil impacting

other coil or assembly table.

03 104

103 05

03 104

103 05

03

104

103 05

Return end view

Ready to disassemble Removed the collars Coils fell off

03 104

103 05 103

104

104

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H. Felice and all 5

Preliminary Assessment summarydetails in back-up slides

03

05103

104

Coil 103• No visual damage• Electrical tests ongoing –

delayed due to high humidity

Coil 3• Some local scratches (red

circle area) • All electrical tests ok

Coil 104• OL splice: epoxy delamination• Damaged wiring of the SG bridges

(temp comp), SG are intact• Indents on the coil OD• Bump on the midplane• All electrical tests ok

Coil 5• Sectioned wiring from bridges to

connector• Kapton GPI damage observed with

epoxy amange underneath where coil 104 SG impacted coil 5

• Electrical tests ongoing – delayed due to high humidity

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H. Felice and all 6

1st assessment following the incident

• Visual inspection presented at a dedicated meeting the day after the incident on 7/8/2015

• Electrical tests started on 07/07/2015 and ongoing• Continuity checks with hand-held meter:

o between PH and coilo between coil and end shoeso between IL and OL ends at both ends

• Take sequential R measurements for all coils. • Inductance measurements for all coils.• Impulse tests and compare with pre-assembly measurements.• Full set Hi-pot test (e.g., coil vs. PH, endshoe vs. endshoe and etc).

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H. Felice and all 7

Plan agreed on 07/08/2015

• Assessment of the coils continues this week (07/13/17) by LBNL to provide a more detailed description of the observations. Complete electrical tests.

• LARP management visit to LBNL for the MQXFA review: will take a look at the coils• CERN/LARP skype call on Friday : possible decision to move forward if coils are assessed

ok

• Early following week (07/20-22): report finalized

• Readiness review (if coils not ok) or decision meeting (if coils ok) week of 07/27

Possible spare coils• Coil 6: being impregnated• Coil 102: possible problematic splice• Coil 2: already tested in the mirror

Updated schedule will be presented soon

07/13/2015

Slides presented on 07/08/2015By Heng Pan, Dan Cheng and Helene Felice

Back-up slides

H. Felice and all 9

Incident pictures

Coil 104

Epoxy delaminated on the lead end splice area

Before incident

Before incident

07/13/2015

H. Felice and all 10

Incident pictures

Coil 104

Strain gauge wires broken Before incident

• The temperature compensator strain gauges were inspected, no damage.

• Need to be rewired.

Temperature compensator pad separated

07/13/2015

H. Felice and all 11

Incident pictures

Coil 104

• Dent observed in the GPI Kapton layer. No visible damage to the coil itself

07/13/2015

H. Felice and all 12

Incident pictures

Coil 104

• Bump on the midplane, dent observed in the Kapton GPI. Evidence of epoxy damage on the coil.

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H. Felice and all 13

Incident pictures

Coil 104

• Dent on the RE end shoe observed. It looks like the coil dropped on an object on the assembly table (not sure what).

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H. Felice and all 14

Incident pictures

Coil 05

• All strain gauge wires were cut.

Coil 03

Coil 05

03

05103

07/13/2015

H. Felice and all 15

Incident pictures

Coil 05

• Kapton GPI damage observed, likely due to catching the SG temperature compensator pad of Coil 104. Evidence of epoxy damage underneath.

Coils fell off

03

05103

104

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H. Felice and all 16

Incident pictures

Coil 03

• RE endshoe: Dents and scratches observed.

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H. Felice and all 17

Incident pictures

Coil 03

• Dents and scratches observed.

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H. Felice and all 18

Incident pictures

Coil 03

• Dents and scratches observed on the lead end.

Before incident

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H. Felice and all 19

Coil inspections

• Visual inspections• Electrical checks (priorities on 104, 3, 5):

• Continuity checks with hand-held meter:o between PH and coilo between coil and end shoeso between IL and OL ends at both ends

• Take sequential R measurements for all coils. • Inductance measurements for all coils.• Impulse tests and compare with pre-assembly measurements.• Full set Hi-pot test (e.g., coil vs. PH, endshoe vs. endshoe and etc).

Coil 104 Coil 03 Coil 05 Coil 103

Visual inspection √ √ √ √

Continuity check √ √ planned planned

Sequential R √ √ planned planned

Impulse test √ √ planned planned

Inductance measurement planed planed planed planned

Hi pot √ ongoing planned planned

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H. Felice and all 20

Coil inspections

0.00E+00 1.00E-05 2.00E-05 3.00E-05 4.00E-05 5.00E-05 6.00E-05

-2000

-1500

-1000

-500

0

500

1000

1500

2000

2500

MQXFS 104 Pre/Post Event Impulse Test

2000 V Pre Event 2000 V Post Event

0.00E+00 1.00E-05 2.00E-05 3.00E-05 4.00E-05 5.00E-05 6.00E-05

-2000

-1500

-1000

-500

0

500

1000

1500

2000

2500

SQXF 03 Pre/Post Event Impulse Test

2000 V Pre Event 2000 V Post Event

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Coil inspections

  Coil            

PHA01 2500/2500 PHA01          

PHA02 2500/2500           

PHB01 2500/2500 

PHA02        

PHB02 2500/2500    PHB01      

PHB03 2500/2500      PHB02 PHB03 PHB04    

PHB04 2500/2500        LE IL  

Endshoe

LE IL Endshoe 1000/1000 2500/2500 2500/2500       

LE OL Endshoe 1000/1000   

2500/2500 2500/2500 2500/2500 2500/2500 600/600RE IL

Endshoe

RE IL Endshoe 1000/1000 2500/2500 2500/2500       

RE OL Endshoe 1000/1000   

2500/2500 2500/2500 2500/2500 2500/2500 

600/600

Pole 500/500   

Coil104 – pre/post incident

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H. Felice and all 22

Summary and next steps

Electrical assessment• Coil 104 passed all the electrical tests listed in the slide 15.• Coil 03 passed the continuity test, sequential R test and impulse test, hi

pot test is ongoing.• Coils 05 and 103 will be electrically checked as well.

Repair plan:• GPI layers replacement• Repair/dress epoxy as necessary• Strain gauge repairs to 104 and 005• Schedule TBD

07/13/2015