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CASE STUDY 1: Group 1C. Nb 3 Sn Quadrupole Magnet. R. Bonomi R. Kleindienst J. Munilla Lopez M. Chaibi E. Rogez. CERN Accelerator School, Erice 2013. GOAL. LHC upgrade requires quadrupole magnets with larger apperture .

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r bonomi r kleindienst j munilla lopez m chaibi e rogez

CASE STUDY 1: Group 1C

Nb3SnQuadrupole Magnet

R. Bonomi

R. Kleindienst

J. Munilla Lopez

M. Chaibi

E. Rogez

CERN Accelerator School, Erice 2013

slide2

GOAL

  • LHC upgrade requires quadrupole magnets with larger apperture.
  • Design proposal for Nb3Sn superconducting quadrupole with 150 mm aperture for operation at 1.9 K.
  • Study includes coil design, magnetic and mechanical properties.

CERN Accelerator School, Erice 2013

slide3

COIL WIDTH

  • The magneticgradientdepends on thewidthofthecoil
  • Adding additional coilwidthleadstodiminishingrewards
  • A relativelythin design was chosenas a compromisebetweencostandgradient

-> 2 coils of 10 mm width

  • Twolayerschosentoallowmorepossibilities in design forminimizingfielderrors

3

CERN Accelerator School, Erice 2013

slide4

CABLE PARAMETERS

t

w

4

CERN Accelerator School, Erice 2013

slide5

LOAD LINE

  • Loadline plottedforourconfiguration
  • Short sample and operational parameterscomputed
  • Higher fieldgradientpossiblewith(118 T/m vs. 83 T/m)
  • Temperaturestabilitymarginhigherby~3K

CERN Accelerator School, Erice 2013

slide6

COIL LAYOUT

  • Coil layout used to compensate higher order multipoles
  • Each sector used to cancel out next non-forbiddenorder

CERN Accelerator School, Erice 2013

slide7

MECHANICAL DESIGN

  • Mechanical Design shouldavoidtensile stress
  • Thinshellapproximationused(26%)
  • Forces computedusingformula:
  • Iron yokesupporting 90% ofIss
  • Collarthickness 20 mm for a maximum stress of 70 MPa
  • Thicknessofshrinkingcylinder12 mm forupto 100 MPa

-> Useof Aluminium possible

CERN Accelerator School, Erice 2013

slide9

ISSUES: YBCO vs. Bi2212

  • Both are cuprites, the SC isconfinedtotheCuO plane, mechanism not fullyunderstood
  • In bothcases high criticalcurrentin singlecrystals, howeverseverlyloweredby grain boundries!
  • Bi2212, unlike YBCO canbeformedtoroundwiresusing power in tubeprocess
  • Compactionandheatinghave large impact on SC-properties, large parameterspacetooptimize

CERN Accelerator School, Erice 2013

slide10

ISSUES: SC COIL DESIGN

  • The block-coil geometry naturally suppresses extrinsic losses, which typically constitute ~half of all ac losses, which are reduced in the block-coil geometry by the aspect ratio of the cable, typically 10:1
  • The simple equivalent block-coil design requires 20% less superconductor than the cosθ design of the same aperture and field strength.
  • Furthermore, one of the characteristics of the block-coil model is its scalability. After having studied the basic characteristics of a small aperture block coil magnets, an attempt could be made to design a large aperture magnet in a fast and efficient way by scaling up both the dimension of the aperture and the number of the blocks.

CERN Accelerator School, Erice 2013

slide11

ISSUES: ASSEMBLY PROCEDURE

  • Pre-stress isneededtobesurethatnotensilestresses will beapplied on thecoil
  • Pre-stress isusuallyloweredwhenthemagnetiscooled down
  • Enoughamountofpre-stress toremainatcompressivestateofstressesateveryoperationconditionisneeded.
  • As a generalrule, pre-stress shouldbeassmallasneededtoaccomplishthiscondition, plus somesafetymarginofsomeMpaastypicalvalue (0-30 MPa)

CERN Accelerator School, Erice 2013