Download presentation
Presentation is loading. Please wait.
1
Cosq configuration - Mechanics
BARBARA CAIFFI on behalf of INFN team: G. Bellomo, P. Fabbricatore, S.Farinon, V. Marinozzi, M. Sorbi , A.M. Ricci and G. Volpini
2
Outlook Optimised inter-beam distance lead to new e.m. configurations → new optimized mechanics configuration have been found. Steel Pad: -single aperture -double aperture -sensitivity analysis on titanium pole notch dimension -longitudinal forces Iron Pad: Preliminary 3D E.M. analysis: - optimization of harmonics and peak field both for sides with and without connections for the configuration with the iron pad Conclusions
3
Inter-beam distance Mechanics sensitive to inter-beam distance: with optimized pad dimension, 250 mm inter-beam distance introduces asymmetry in the mechanics structure d=250 mm d=204 mm ENERGIZATION ENERGIZATION Contact pressure [MPa] Contact pressure [MPa]
4
Single Aperture: Steel Pad ANSYS Model
Al alloy Bladder&Key: -Key 1: length=30 mm, thickness=2 mm, interference 0.6 mm; -Key 2 : length=10 mm, thickness 2 mm, interference 0.01 mm; Steel Pad: - rectangular shaped - cut vertically - hole 20 mm radius for rods Iron yoke: - 375 mm external radius -cut at 45o Al Alloy shell: -55 mm thick Iron Key2 Steel 1.5 mm insulation Key1 112 mm 102 mm 375 mm 55 mm
5
Single Aperture: Steel Pad Contact Pressure & VM stress
Assembly Cool Down 16T Contact Pressure [Pa] sVMpeak=116 MPa sVMpeak=210 MPa sVMpeak=165 MPa VM stress [Pa]
6
Single Aperture: Steel Pad VM stress on Mechanical Structures
ASSEMBLY COOL DOWN ENERGIZATION (16T) YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:457 MPa smax:1100 MPa smax:736 MPa IRON YOKE ASSEMBLY COOL DOWN ENERGIZATION (16T) YIELD LIMIT smax:436 MPa YIELD LIMIT YIELD LIMIT smax:686 MPa smax:1100 MPa
7
Single Aperture: Steel Pad VM stress on Mechanical Structures
Ti Pole ASSEMBLY COOL DOWN ENERGIZATION (16T) YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:900 MPa smax:900 MPa smax:1130 MPa smax:330 MPa Al Alloy Shell ASSEMBLY COOL DOWN ENERGIZATION (16T) YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:247 MPa smax:370 MPa smax:660 MPa
8
Single Aperture: Steel Pad Conductor Displacement
Cool Down 16T 2 1 2 1 Displacement due to energization with respect to cool down: Dx1= 248 mm Dx2= 160 mm
9
Single Aperture: Steel Pad Sensitivity on Ti nose notch dimensions
Ti Pole reference ASSEMBLY VM stress[Pa] VM stress[Pa] q=82o(Dx =-1 mm) q=85o Contact Pressure [Pa] ENERGIZATION (16T) Contact Pressure [Pa]
10
Double Aperture: Steel Pad ANSYS Model
Bladder&Key: -Key1, key4: length=30 mm, thickness=2 mm, interference 0.6 mm; -Key2, key3: length=10 mm, thickness 2 mm, interference 0.01 mm; Steel Pad: - rectangular shape - cut vertically - hole 20 mm radius for rods Iron yoke: - 375 mm external radius -cut at 45o Al Alloy shell: -75 mm thick Key3 Key2 Key4 Key1
11
Double Aperture: Steel Pad Contact Pressure & VM stress
Assembly Cool Down 16T Contact Pressure [Pa] sVMpeak=160 MPa sVMpeak=206 MPa sVMpeak=180 MPa VM stress [Pa]
12
Double Aperture: Steel Pad VM stress on Mechanical Structures
ASSEMBLY COOL DOWN ENERGIZATION (16T) YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:960 MPa smax:576 MPa smax:900 MPa IRON YOKE ASSEMBLY COOL DOWN ENERGIZATION (16T) YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:672 MPa smax:316 MPa smax:650 MPa
13
Double Aperture: Steel Pad VM stress on Mechanical Structures
Ti Pole ASSEMBLY COOL DOWN ENERGIZATION (16T) smax:1000 MPa smax:300 MPa smax:1050 MPa YIELD LIMIT YIELD LIMIT YIELD LIMIT Al Alloy Shell COOL DOWN ENERGIZATION (16T) ASSEMBLY YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:390 MPa smax:420 MPa smax:790 MPa
14
Double Aperture: Steel Pad Conductor displacements
Cool Down 16T 1 2 1 2 3 4 3 4 Displacement due to energization with respect to cool down: Dx1= -36 mm Dx2=-148 mm Dx3= 330 mm Dx4= 231 mm
15
Double Aperture: Steel Pad Longitudinal Forces
𝐹 𝑧 = 𝜕𝐸 𝜕𝑧 ∼ 𝐸 𝐿 Total stored 2D magnetic energy = Longitudinal force F z=0.6 MN (From ANSYS, ¼ of the model ) Maximum tensile pressure applied by rods : 200 MPa Two rods for each ¼ , area of a single rod A=pR2=1.26E-3 m2 (R=0.02 m) Total force applied by the rods Frods=200E6*1.26E-3*2=0.5 MN -> 85% of the longitudinal force
16
Double Aperture: Iron Pad ANSYS Model
Bladder&Key: -Key1,k ey4: length=30 mm, thickness=2 mm, interference 0.6 mm; -Key2, key3: length=10 mm, thickness 2 mm, interference 0.01 mm; Iron Pad: - rectangular shape - cut vertically - hole 20 mm radius for rods Iron yoke: - 375 mm external radius -cut at 45o Al Alloy shell: -75 mm thick
17
Double Aperture: Iron Pad VM stress & contact pressure
ASSEMBLY COOL DOWN ENERGIZATION Contact pressure [Pa] Contact pressure [Pa] Contact pressure Pa] VM stress[Pa] VM stress[Pa] VM stress[Pa] sVM MAX=160 MPa sVM MAX=191 MPa sVM MAX=200 MPa
18
Double Aperture: Iron Pad VM stress on mechanical structures
COOL DOWN ENERGIZATION ASSEMBLY YIELD LIMIT YIELD LIMIT YIELD LIMIT smax:750 MPa smax:740 MPa At warm smax=430 MPa on iron, 700MPa of yield strength is required. Rods holes position could be optimized to decrease the stress on the iron.
19
Preliminary 3D E.M. analysis
Preliminary analysis on harmonics and peak field has been performed both for the side with and without connections, using the Roxie code. The configuration with the iron pad has been studied so far. Connection side Side opposite to connections
21
Conclusions Promising mechanical and e.m. configurations have been found with reduced inter-beam distance (204 mm instead of 250 mm); Both single and double aperture configurations fulfil constrains on mechanical stress on the conductors and on the mechanical structures, as well as good contact pressure between the conductors and the titanium poles. Notches in the 1st and 2nd layer poles are mandatory to achieve good contact pressure, though they increase the mechanical stresses on Ti, in particular at warm. The sensitivity on the dimension of the notch is not very strict. A solution with the iron pad was also investigated and gave interesting results. Stress on the conductors and contact pressure fulfil the required criteria. A yield strength of at least 500 MPa is mandatory for the iron. A preliminary 3D E.M. analysis has been performed on the iron pad configuration. Integrated harmonics are close to unit except for b2=62. Bpeak =14.6 T.
Similar presentations
