configuration J Munilla F Toral CIEMAT Common Coil update Remarks 2 Main challenging specifications to be reached in the mechanical design are ID: 930733
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Slide1
16 T dipole in common coil configuration
J. Munilla, F. Toral - CIEMAT
Slide2Common Coil
update: Remarks
2Main
challenging
specifications
to
be
reached
in
the
mechanical
design
are:
Compressive
loads
in
all
directions
for
the
coil
Von Mises stress (
Coil
) up
to
150 MPa (
warm
), 200 MPa (
cold
)
Avoid
frictional
sliding
of
coil
surfaces
Low
distorsion
on
wire
arrangement
from
magnetic
forces
Moderate
principal stress
value
for
iron
at
cold
Limited
size
Slide3Common Coil
update: Remarks
3First
conclusions
:
It
is
not possible to meet all of them given magnetic designMain constraints seem to be:Small distance from coil to aperture (it affects to the SC efficiency)Height/Width ratio vs Vertical/Horizontal forces. (Should be easier using more coils, but it results in larger magnet outer diameter)
Main
challenging
specifications
to
be
reached
in
the
mechanical
design
are:
Compressive
loads
in
all
directions
for
the
coil
Von Mises stress (
Coil
) up
to
150 MPa (
warm
), 200 MPa (
cold
)
Avoid
frictional
sliding
of
coil
surfaces
Low
distorsion
on
wire
arrangement
from
magnetic
forces
Moderate
principal stress
value
for
iron
at
cold
Limited
size
Slide4Common Coil
scheme: main constraints
4
Such
an
small
distance (2,5 mm) from cable to 50 mm diameter aperture is not enough to support the horizontal preload.But increasing this value would result in lowering SC efficiency.
Slide5Common Coil
scheme: Main constraints
5
Vertical
dimension
shrinks
more
than
horizontal (absolute value), and magnetic vertical force tries also to reduce height. Coils could suffer buckling during vertical preloading at this slender configurationOn the other hand, horizontal magnetic force is much larger so horizontal preload needs to be high also
Slide6Common Coil
update: Remarks
6
First
conclusions
:
It
is not possible to meet all of them given magnetic designMain constraints seem to be:Small distance
from
coil
to
aperture
(
it
affects
to
the
SC efficiency)Height/Width ratio vs Vertical/Horizontal forces. (Should be easier using more coils, but it results in larger magnet)
Could any of them be slightly overpassed?If so, different possibilities can be reached:In FCC17 week concept design, there are some sliding surfacesIn these slides, a concept with some traction stress (small) is shown
Main
challenging
specifications
to
be
reached
in
the
mechanical
design
are:
Compressive
loads
in
all
directions
for
the
coil
Von Mises stress (
Coil
) up
to
150 MPa (
warm
), 200 MPa (
cold
)
Avoid
frictional
sliding
of
coil
surfaces
Low
distorsion
on
wire
arrangement
from
magnetic
forces
Moderate
principal stress
value
for
iron
at
cold
Limited
size
Slide7Mechanical concept
7
d=910 mm
Interference ≈0,1 mm
No interference
Slide8Mechanical
concept:
Coils
8
Change lateral pad stiffness distribution, so preload is not focused over the thin supporting structure in the mid-coil plane
Intermediate supports partially release accumulated force between coils
Inner supports split assembly
Slide9Results: Horizontal Stress
Assembly
Cold
16 T
Slide10Results: Vertical Stress
AssemblyCold
16 T
Less than +
10
Mpa
for local value
Slide11Results: VM Stress
AssemblyCold
16 T
Slide12Results: Horizontal Displacement
AssemblyFrom Assembly to Cold
From cold to 16 T
Slide13Results: Vertical Displacement
Assembly
From Assembly to Cold
From cold to 16 T
Slide14Results: VM Stresses
at 16 TSupporting structure (642 MPa)
Iron (147 MPa)
SS Cylinder (262 MPa)
Slide15Conclusions
15
OPEN SUPPORT (16T)
Displ
.
X COILS (mm)
0,58 / 0,40
Displ
.
Y COILS (mm)0,03 / -0,23σVM Support (MPa)527CLOSED SUPPORT (KEYS) (16T)Displ. X COILS (mm)0,275 / 0,11Displ. Y COILS (mm)0,52 / -0,25σVM Support (MPa)1059CLOSED SUPPORT (LIMITED PRELOAD)
(16T)
Displ
.
X COILS (mm)
0,42
/
0,25
Displ
.
Y COILS (mm)
0,05
/ -0,25
σ
VM
Support (MPa)650Max. Local Traction at coils10 MPa
Slide16Conclusions
16
Conceptual
design
of a
common
coil
magnetic design has been exploredGiven the optimum design based on magnetic requirements, mechanical behavior was explored but it seems to be very difficult to comply all the specifications criteria.
Three
main
options
were
explored
along
previous months. They
can be
classified
according to the amount of preload involved at warm assembly. All of them were explored from the beginning to sligthly evaluate the most typical options on concept designs,
manufacturing methods, materials,…At this stage, an option which complies all the criteria could not be found.Possibilities could be on some
changes
on
the
magnetic
design
,
or
at
the
specifications
/
initial
constraints
Thank
you
for
your
attention