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CASE STUDY PRESENTATION

CASE STUDY PRESENTATION. Case number 2 : Design a Nb -Ti superconducting quadrupole with a 120mm aperture for the upgrade of the LHC interaction region operating at 1.9K. FERRAND, G./JECKLIN, N. / PURUSHOTHAMAN, S. / STODEL, M.H. / YUE, W. Our quadrupole design. Parameters:

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CASE STUDY PRESENTATION

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  1. CASE STUDY PRESENTATION Case number 2 : Design a Nb-Ti superconducting quadrupole with a 120mm aperture for the upgrade of the LHC interaction region operating at 1.9K FERRAND, G./JECKLIN, N. / PURUSHOTHAMAN, S. / STODEL, M.H. / YUE, W.

  2. Our quadrupoledesign Parameters: Number of cablelayers : 2 (Rutherford-likecable) Pitch angle Pitch length = 120 mm Compaction: Insulator : Rutherford cable : Quadrupole : Filling factor :

  3. Our quadrupole design Gradient as a function of coil width • Our choices : • Gradient = 140(T/m) • Coil width = 32(mm) / divided in 2 cables of 16(mm)

  4. Our quadrupole design Typical values of pitch angle Typical values of strand diameters NbTiNb3Sn NbTiNb3Sn Our choice : 0.8 mm Our choice : 14.93° Bruzzone, CAS, Erice (I) 25 April - 4 May 2013 Typical values of Cu/SC ratio (ratio btw. area of Cu and area of SC material) Typical values width/thickness compaction NbTiNb3Sn NbTiNb3Sn Our choice : Cw = -6.67% Cth= -10% Our choice : 1.56 Flükiger, CAS, Erice (I) 25 April - 4 May 2013 Bruzzone, CAS, Erice (I) 25 April - 4 May 2013 Flükiger, CAS, Erice (I) 25 April - 4 May 2013

  5. Load Line Calculation 100 % Intersection : 80% Margin : Limittemperature : 4 K

  6. Comparisonwith Nb3Sn Same parameters of the cableswith Nb3Sn 100 % 80% : Margin : Comparison 80% : NbTi – Vs – Nb3Sn

  7. Possible Layout Cancel: : Possible solution: Source : Todesco, USPAS 2012

  8. EM forces and stress atoperational conditions Sector approximation • a1 = 0.06 (m) • a2 = 0.0924 (m) • Jo-op= 396 (A/mm2) = 3.96 108 (A/m2) Comparison LHC Dipoles:

  9. Dimensioning 90 % of short-sample conditions : Ironshield: . Maximum force applied to the collar : = 2.1 (MN/m). Strain : From LHC dipolecollars data (includingmargins): 10 mm for . By analogy, for ourquadrupole, 15 (mm) must beenough, includingmargins.

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