Heng Pan 672019 H Pan 2 Coilwedges and Coil pole interfaces QXF Coilpole contact Coilwedges contact CP1 Layer 1 coilpole CP2 Layer 2 coilpole CW11 Layer 1 coil block 3 wedge ID: 800330
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Slide1
Shear stress distributions at the coil/wedges and coil/pole interfaces (MQXFA1)---updates
Heng Pan
Slide26/7/2019
H. Pan
2
Coil/wedges and Coil/ pole interfaces (QXF)
Coil/pole contact
Coil/wedges contact
CP-1: Layer 1, coil/pole
CP-2: Layer 2, coil/pole
CW-11: Layer 1, coil block 3 / wedge
CW-12: Layer 1, coil block 4 / wedge
CW-21: Layer 2, coil block 1 / wedgeCW-22: Layer 2, coil block 2 / wedge
CP-2
CP-1
CW-11
CW-12
CW-21
CW-22
1
2
3
4
Slide36/7/2019
H. Pan
3
Axial load and thermal contraction rate
This analysis uses the following material properties provided by Eddie
Holik
.
Axial and azimuthal load in the model is remained same as used in the previous analysis:
206 kN /coil @R.T.; 292 kN @4.2 K(~100% of Fz
; old target, close to MQXFS1c);Azimuthal load is set 640
μm interference (reviewed in “MQXFA1 Assembly & Loading Readiness Review”:https://indico.fnal.gov/conferenceDisplay.py?confId=14044)
Material
E [GPa]
Poisson
ratio
Thermal contraction
coeff
293
K
4.3
K
293 K/4.3K
293 K -> 4.3K
R
θ
Z
Coil
*
20
20
0.3
2.26
e-3
3.86
e-
32.37e-3Pole (Titanium)1301300.31.74e-3Wedge (Al bronze)1101200.33.12e-3
*Note: In the previous analysis, the thermal contraction rate of coil blocks is 3.88e-3 isotropic
Slide46/7/2019
H. Pan
4
Shear stresses at interface CP-1 (Straight section)
Coil/pole interface --- Layer 1 CP-1 (straight section)
R.T.
4.2 K
130 T/m
Shear stress at the interface CP-1 averagely is < 5 MPa at nominal current (130 T/m)
Coil center
Coil end
Slide56/7/2019
H. Pan
5
Shear stresses at interface CP-2 (Straight section)
Coil/pole interface --- Layer 2 CP-2 (straight section)
R.T.
4.2 K
130 T/m
Shear stress at the interface CP-2 averagely is 4-7 MPa at nominal current (130 T/m)
Coil center
Coil end
Slide66/7/2019
H. Pan
6
Shear stresses at interface CW-12 (Straight section)
Coil/pole interface --- Layer 1 CW-12 (straight section)
R.T.
4.2 K
130 T/m
CW-12
Shear stress at the interface CW-12 reduced
from cool-down to nominal current (130 T/m).
The peak shear stress is ~13 MPa at 130
T/m
High shear stress area --- straight section/ end section
Slide76/7/2019
H. Pan
7
Shear stresses at interface CW-11 (Straight section)
Coil/pole interface --- Layer 1 CW-11 (straight section)
R.T.
4.2 K
130 T/m
Shear stress at the interface CW-12 reduced to from cool-down to nominal current (130 T/m).
The overall shear stress is ~3 MPa at 130 T/m.
CW-11
Slide86/7/2019
H. Pan
8
Shear stresses at interface CW-22 (Straight section)
Coil/pole interface --- Layer 2 CW-22 (straight section)
R.T.
4.2 K
130 T/m
Shear stress at the interface CW-22 reduced to from cool-down to nominal current (130 T/m).
The peak shear stress is ~9 MPa at 130 T/m.
CW-22
Slide96/7/2019
H. Pan
9
Shear stresses at interface CW-21 (Straight section)
Coil/pole interface --- Layer 2 CW-21 (straight section)
R.T.
4.2 K
130 T/m
Shear stress at the interface CW-21 reduced to from cool-down to nominal current (130 T/m).
The peak shear stress is ~6 MPa at 130 T/m.
CW-21