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16 T dipole in common coil 16 T dipole in common coil

16 T dipole in common coil - PowerPoint Presentation

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16 T dipole in common coil - PPT Presentation

configuration J Munilla F Toral CIEMAT Common Coil update Remarks 2 Main challenging specifications to be reached in the mechanical design are ID: 930733

mpa coil cold coils coil mpa coils cold stress magnetic horizontal design results vertical support common assembly mechanical main

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Slide1

16 T dipole in common coil configuration

J. Munilla, F. Toral - CIEMAT

Slide2

Common 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

Slide3

Common 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

Slide4

Common 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.

Slide5

Common 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

Slide6

Common 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

Slide7

Mechanical concept

7

d=910 mm

Interference ≈0,1 mm

No interference

Slide8

Mechanical

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

Slide9

Results: Horizontal Stress

Assembly

Cold

16 T

Slide10

Results: Vertical Stress

AssemblyCold

16 T

Less than +

10

Mpa

for local value

Slide11

Results: VM Stress

AssemblyCold

16 T

Slide12

Results: Horizontal Displacement

AssemblyFrom Assembly to Cold

From cold to 16 T

Slide13

Results: Vertical Displacement

Assembly

From Assembly to Cold

From cold to 16 T

Slide14

Results: VM Stresses

at 16 TSupporting structure (642 MPa)

Iron (147 MPa)

SS Cylinder (262 MPa)

Slide15

Conclusions

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

Slide16

Conclusions

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