lq mechanical behavior overview and next steps n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
LQ Mechanical Behavior Overview and Next Steps PowerPoint Presentation
Download Presentation
LQ Mechanical Behavior Overview and Next Steps

Loading in 2 Seconds...

play fullscreen
1 / 26

LQ Mechanical Behavior Overview and Next Steps - PowerPoint PPT Presentation


  • 80 Views
  • Uploaded on

LQ Mechanical Behavior Overview and Next Steps. 2 nd Joint HiLumi LHC – LARP Annual Meeting INFN Frascati – November 14 th to 16 th 2012 Helene Felice Paolo Ferracin. Work supported by the U . S. Department of Energy, under Contract No. DE-AC02-05CH11231 . Overview. Magnet Overview.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'LQ Mechanical Behavior Overview and Next Steps' - walter


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
lq mechanical behavior overview and next steps

LQ Mechanical Behavior Overviewand Next Steps

2nd Joint HiLumi LHC – LARP Annual Meeting

INFN Frascati – November 14th to 16th 2012

Helene Felice

Paolo Ferracin

Work supported by the U. S. Department of Energy, under Contract No. DE-AC02-05CH11231

overview
Overview
  • Magnet Overview
  • Mechanical analysis and SG data comparison
  • Next steps

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lq design overview
LQ Design overview
  • 90 mm aperture coils with Ti poles
  • Iron pads, masters, yokes, Al shell
  • Pre-load with bladders and keys
  • LQS01-2 Short-sample limits (4.5 K – 1.9 K)
    • Gss: 240 T/m – 267 T/m
    • Iss: 13.8 kA – 15.4 kA
    • Peak field: 12.3 T - 13.6 T
  • LQS03 Short sample limit
    • -Gss: 227 T/m – 250 T/m
    • Iss: 12.9 kA – 14.4 kA
    • Peak field: 11.5 T - 12.8 T
  • End support: plate and rods
  • Magnet/coil length: 3.7/3.4 m

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lq assembly
LQ assembly
  • Total of 60 gauges mounted (q and z)
  • 20 on shell, 32 on coil poles, 8 on rods
  • Four axial locations along coil length

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lq strain gauges
LQ strain gauges
  • Shell and coil stations
    • q and z gauges thermally compensated
    • 10 shell stations
    • 4 stations per coil
  • 2 gauges/rod => 1 signal/rod
  • Total of 60 gauges

Measurements presented here are averages of the various gauges

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

mechanical analysis typical stress distribution
Mechanical AnalysisTypical Stress distribution

Rod

Shell

Pole

  • Preload for 260 T/m
  • sq and eq at 300 K
  • target (3D): + 56 MPa
    • + 750 me
  • sq and eq at 4.3 K
  • target (3D): + 183 MPa
    • +2080 me
    • sq (MPa)
  • Preload for 240 T/m: 471 kN
  • sz and ez at 300 K
  • target (3D): +88 Mpa (178 kN)
    • +455 me
  • sz and ez at 4.3 K
  • target (3D): + 239 MPa
    • + 1138 me
  • Preload for 260 T/m
  • sq and eq at 300 K
  • target (3D): -82 MPa
    • -580 me
  • sq and eq at 4.3 K
  • target (3D): -157 MPa
    • -1031 me
  • sq (MPa)

End Contact pressure (Mpa)

NO gap

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqsd structure validation 2009
LQSD: structure validation (2009)
  • Loading and cool-down to 77K with instrumented aluminum dummy coils
  • Validation of the structure behavior

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs01a summary azimuthal stress
LQS01a SummaryAzimuthal stress

Radial shim thickness

LQS01a Gradient preload: 230-240 T/m

30 mils ~ 750 mm

LQS01b

LQS01a

From LQS01a to LQS01b

Reduction of the radial shimming from 30 to 15 mils

Fuji Test to confirm

Some unloading of the pole suggested lack of preload

Nominal

Oversized

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs01b summary azimuthal stress
LQS01b SummaryAzimuthal stress

Radial shim thickness

LQS01a Gradient preload: 230-240 T/m

LQS01b Gradient preload: 260-270T/m

15 mils ~ 375 mm

30 mils ~ 750 mm

LQS01b loading required a bladder pressure of 8000 psi = 55 MPa

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs02 summary azimuthal stress
LQS02 SummaryAzimuthal stress

Radial shim thickness

LQS01a Gradient preload: 230-240 T/m

LQS01b Gradient preload: 260-270T/m

LQS02 Gradient preload: 260-270 T/m

15 mils ~ 375 mm

15 mils ~ 375 mm

30 mils ~ 750 mm

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs03 assembly target and motivation
LQS03 assembly target and motivation
  • LQS03 assembly target were chosen identical to LQS02 assembly targets
    • Some uncertainty about the reason behind the lack of performance of LQS02
    • Concern about mid-plane block quenches
      • conservative approach in keeping the same preload
      • 1-to-1 comparison with LQS02 – only change of conductor
      • Unloading of the pole can be handled by a “healthy magnet” => TQS03a

LQ

TQS03

227 T/m

93% Iss

209 T/m

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs03 loading conditions
LQS03 Loading conditions

Radial shim thickness

LQS01a Gradient preload: 230-240 T/m

LQS01b Gradient preload: 260-270T/m

LQS02 Gradient preload: 260-270 T/m

LQS03 same preload as LQS02

15 mils ~ 375 mm

15 mils ~ 375 mm

30 mils ~ 750 mm

10 mils ~ 250 mm

56 MPa

-82 MPa

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

sg shell data during assembly
SG shell data during assembly

LQS01a

LQS01b

67 +/- 6 MPa

34 +/- 8 MPa

LQS02

LQS03

57 +/- 8 MPa

56 +/- 8 MPa

Shell SG behave consistently during assembly

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

sg rod data during assembly
SG Rod data during assembly

LQS01a

LQS01b

94 +/- 5 MPa

60 +/- 3 MPa

LQS02

LQS03

92 +/- 3 MPa

92 +/- 2 MPa

Rod SG behave consistently during assembly

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

sg coil pole pieces data
SG Coil Pole pieces data

LQS01b

+5 12 MPa

LQS01a

-107  26 MPa

LQS02

-69+/- 27 MPa

LQS03

After LQS01a:

-SG in compression

-Large spread

-77 +/- 21 MPa

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

sg shell data during cool down
SG shell data during cool-down

LQS01a

LQS01b

199+/- 8 MPa

147+/- 6 MPa

LQS02

177+/- 9MPa

183+/- 9MPa

Shell SG behave consistently during cool-down

LQS03

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

sg rod data during cool down
SG rod data during cool-down

LQS01a

LQS01b

239+/- 9 MPa

197+/- 11 MPa

LQS03

LQS02

LQS03

230+/- 10 MPa

Rod SG behave consistently during cool-down

235+/- 10 MPa

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

sg coil pole pieces strain data during cool down
SG Coil Pole pieces strain data during cool-down

LQS01a

-179+/- 104 me

LQS01b

LQS03

LQS02

Pole SG remain difficult to trust during cool-down

-764+/- 372 me

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs03 sg investigation
LQS03 SG Investigation
  • No correlation in terms of station location
  • No correlation in terms of coil
  • No correlation between T and Z
  • Amplitude of SG signals is inconsistent with magnet performance
  • Impact on the magnet performance are unclear:
    • No signs of mechanical motion recorded during training
    • No clear precursor to quench
  • Temperature compensator might be in cause
  • SG de-bonding?
  • Might require a visual inspection

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

excitation
Excitation

LQS01a

LQS03

  • LQS03
  • SG in tension still respond to excitation
  • Slightly different rate of unloading observed from one coil to the other
  • 1 station shows sign of unloading

LQS01b

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs03 warm up shell and rods sg
LQS03 Warm upShell and rods SG
  • Shell remains consistent
  • Usual relaxation after the first test

716 +/- 101 me

584 +/- 101 me

  • Rods recover their initial tension

485+/- 15 me

495+/- 15 me

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lqs03 warm up coil pole sg
LQS03 Warm upCoil pole SG
  • After warm-up, the pole SG do not recover the initial strain and still read some tension

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

lq series summary on mechanical performance
LQ series: Summary on mechanical performance
  • Trust in the capability of the structure to provide required preload:
    • LQSD
    • Linear unloading of the poles monitored by SG
  • Shell and rods are behaving according to the FEM
  • BUT
  • Absolute value of pole pieces SG cannot be trusted
  • Challenge resides in the coil size and matching between pads and coil OD
  • Impact on the magnet performance are unclear:
    • No signs of mechanical motion recorded during training

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice

next steps lqs03b
Next steps – LQS03b
  • Option 1: increase of preload
  • Some concern:
      • Risk of damaging the outer layer
        • Mid-plane quenches in LQS02
        • Signs of pole unloading in LQS02
      • Limit in bladder pressure
        • LQS03: 7500 psi (52 Mpa)
  • Option 2
  • A this point: complete disassembly seems to be the way to learn something
    • 3 to 4 months from magnet at LBL to magnet ready to be shipped to FNAL
    • After disassembly: coil inspection – 2 possible outcomes:
      • Signs of damage on the SG => repair => reassembly
      • No sign of damage of the SG => ?

2nd Joint HiLumi LHC - LARP Annual Meeting - H. Felice