magnets - cern...close to the coil , flux is turning , creating a longitudinal compression, near the...
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![Page 1: MAGNETS - CERN...Close to the coil , flux is turning , creating a longitudinal compression, Near the median plane, part of the flux is returning inside the coil around a zero field](https://reader034.vdocuments.net/reader034/viewer/2022052320/608313f60d9e0640877c58a9/html5/thumbnails/1.jpg)
CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 1
Solenoids
CERN Accelerator School
Bruges , Belgium June 16-25 , 2009
Antoine
DAËL, CEA , Saclay, france
MAGNETS
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 2
A few things that I know about solenoids….
Flux tubesFormulasHomogeneityBitter MagnetSolenoid lenseCMSIseult
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 3
Maxwell equations : think Flux
The phenomenons are perfectly known.
All the day we obey to Maxwell equations to create magnetic field.
The representation of flux tubes is a very powerful method.
Flux is going from North to south
James Clerk MAXWELL
« Think Flux »
Do Coilsplease
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 4Courtesy of Pr Y.Iwasa
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 5
Maxwell’s equations for magneto-statics
Maxwell’s equations have been solved by different methods.
The precision request is in the range of 10-6
Sophisticated computer codes have been developed on a large scale due for RMN & MRI industryThese codes need 3D analytical representation of the field and “double precision”
Div B = 0.Rot H = j
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 6
The Ring Coil
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 7
Ring Coil
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 8
Equivalent length : 2*a
Inflexion at a/2
Long distance effect
Field distribution of a ring coil along axis
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 9
Ring Coil
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 10
Laplace’s theorem: the 3 fingers of the right hand
F = BiLB
F
i
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 11
« Hoop stress »
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 12
Stress=J*B*R(MPa)=(A/mm2)*Tesla*m
100 MPa=100A/mm2*2T*0.5m
Hoop stress in the ring coil (manuscript of Pr Guy Aubert)
The radial force is trying to extend the radius of the ring coil and it is equilibrated by the tension force. The approximation is valid for a turn on itself and slightly pessimistic in solid coils
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 13
Field of a thin solenoid of finite length
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 14
Plotting the flux lines of a thick air core solenoid Flux tubes step1
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 15
Plotting the flux lines of an air core solenoid Flux tubes step2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 16
Plotting the flux lines of an air core solenoid Flux tubes step3
Please remember : Think FLUX
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 17
Plotting the flux lines of an air core solenoid
In the middle , field is homogeneous , flux lines are parallelIn the ends , field is roughly half , flux tubes should betwice largerNear the axis , flux tubes are going very far to close on them selvesClose to the coil , flux is turning , creating a longitudinal compression,Near the median plane, part of the flux is returning insidethe coil around a zero field point.The inner part of the coil is suffering an expanding effortThe outer part of the coil is suffering a radial compression The total force is an expanding effort.
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 18
Thick solenoid
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 19
La compréhension des forces est primordiale
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 20
Thick solenoid
Field formulas for thick solenoids are complicatedPeak fieldLehmann PointInternal magnetic forcesMagnetostatic pressure is equivalent to stored energy
density : B*B/2*Muo
Field Magnetic pressure
1.6Tesla 1MPa
4Tesla 6.25 MPa
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 21
Discussion on homogeneity SMC magnet parameters
2 M Ampere turns per meter are creating around 2.57 T
If a finite solenoid of 300mm in diameterIs only 2 meters long the field drop at 0.1m isalready:
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 22
Ampere’s Theorem
Please remember:
Current Field Length
1A 1mT 1.25 mm
800*2500 = 2M Ampere turns i.e. for 500 Amps 4000 turns per meter
2.57 TeslaFactor 2500
1mFactor 800
It applies to infinite solenoids
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 23
Even a long thin solenoid is not homogeneous…..
B0= MU0*nI*cos(Alpha0)B1= MU0*nI*(cosAlpha1+cosAlpha2)
ALPHA0=8,530 degrés B0=0,9941 TeslaAt z= 0,100m ALPHA1=9,462 degrés ALPHA2= 7,765 degrés
B1=0,98861205
DeltaB/B0=0,005607= 5 10-3
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 24
Long solenoid with small error gap in the winding
0.1 mm error gap is a negative ring coil of 2000 A
DeltaB=-0.0008T in the range of 500 ppmIf you need a magnet with 25 ppm , it is huge
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 25
The Ring Coil
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 26
Long solenoid with errors in the winding
It is impossible to realise the winding of a long solenoidwithout a lot of distributed errors in the range of 0.1mm
The error results in a superposition of ring coil curves randomly distributed .It must be corrected by a family of longitudinal trim coils indepedantly supplied.They will also compensate for the natural drop
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 27
Is
a
b/2
zO
B in a point z of the axis created by a ring coil of radius a situated in b z=b/2 and with current I
= ( )Bz zμ0 Is2 a2
2⎛
⎝
⎜⎜⎜
⎞
⎠
⎟⎟⎟ + a2 ⎛⎝⎜⎜
⎞⎠⎟⎟ − z
b2
2
Is
a
b
O
Is
z
For two rings
= ( )Bz z 0.5 μ0 Is2 a2 ⎛
⎝
⎜⎜⎜⎜⎜⎜
⎞
⎠
⎟⎟⎟⎟⎟⎟
+ 1
+ a2 ⎛⎝⎜⎜
⎞⎠⎟⎟ − z
b2
21
+ a2 ⎛⎝⎜⎜
⎞⎠⎟⎟ + z
b2
2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 28
For two ring coils =
d²Bzdz²
3 μ0 Is2 a2 ( ) − b2 a2
⎛
⎝⎜⎜⎜
⎞
⎠⎟⎟⎟ + a2 b2
4
⎛⎝⎜⎜
⎞⎠⎟⎟
72
d²Bzdz²44
= d²Bzdz²
0 conduit à = a b (position de Helmholtz)
= 45 μ0 Is2 a2 ( ) − + 8 a4 24 a2 b2 4 b4
8⎛
⎝⎜⎜⎜
⎞
⎠⎟⎟⎟ + a2 b2
4
⎛⎝⎜⎜
⎞⎠⎟⎟
112
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 29
a=0,350 2b=0,700
0
0,005
0,01
0,015
0,02
0,025
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 30
a=0,350 2b=0,600
0
0,005
0,01
0,015
0,02
0,025
0,03
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 31
a=0,350 2b=0,500
0
0,005
0,01
0,015
0,02
0,025
0,03
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 32
a=0,350 2b=0,400
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 33
a=0,350 2b=0,300
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 34
a=0,350 2b=0,200
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
0,045
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 35
a=0,350 2b=0,100
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
0,045
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 36
a=0,350 2b=0,000
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
0,045
0,05
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 37
a=0,350 2b=0,350
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
1000ppm in +-65mm
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 38
bO
Optimisation with 3 symetric ring coils
I1
= d²Bzdz²
0d²Bzdz²44
= 0
We look for:
and
The rings have two different currents
I1 and I2.a
I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 39
I1=0A I2=6377A
0
0,002
0,004
0,006
0,008
0,01
0,012
0,014
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 40
I1=6000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 41
I1=7000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 42
I1=8000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 43
I1=9000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 44
I1=10000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 45
I1=11000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 46
I1=12000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 47
I1=13000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 48
I1=14000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 49
I1=15000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
0,04
0,045
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 50
I1=12000A I2=6377A
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T B1
B2
B Total
B3
Ordre 4: two symetric coils ( 2b=0.532) I1 & one central coil I2
1000 ppm in +-115mm
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 51
a=0,350 2b=0,350
0
0,005
0,01
0,015
0,02
0,025
0,03
0,035
‐0,6 ‐0,4 ‐0,2 0 0,2 0,4 0,6
z in m
B in
T
B1
B2
B Total
Ordre 2: 2 Helmholtz coils (12000A)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 52
How to increase the field
Courtesy of Pr Y.Iwasa
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 53
Bitter Magnet
Courtesy of Pr Y.Iwasa
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 54
NHMFL Bitter Magnet
Courtesy of Pr Y.Iwasa
![Page 55: MAGNETS - CERN...Close to the coil , flux is turning , creating a longitudinal compression, Near the median plane, part of the flux is returning inside the coil around a zero field](https://reader034.vdocuments.net/reader034/viewer/2022052320/608313f60d9e0640877c58a9/html5/thumbnails/55.jpg)
CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 55
NHMFL 45 T Hybrid Magnet
Courtesy of Pr Y.Iwasa
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 56Courtesy of Pr Y.Iwasa
![Page 57: MAGNETS - CERN...Close to the coil , flux is turning , creating a longitudinal compression, Near the median plane, part of the flux is returning inside the coil around a zero field](https://reader034.vdocuments.net/reader034/viewer/2022052320/608313f60d9e0640877c58a9/html5/thumbnails/57.jpg)
CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 57
Solenoid Lens for Ion Beam source & LEBT
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 58
Coil parameters
1A 1mT 1.25mm
1A160000At
1mT0,800T
240Factor 200
The magnetic circuit issaturatedJeng=10 A/mm2An electrical Power in the range of 15kWis necessary
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 59
Field level computed by TOSCA
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 60
Field curve of a magnetic lense
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 61
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 62
Steering coils are installed inside the solenoid to save space.
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 63
View of the coils: due to high power , the connections are space consuming.
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 64
Structure 3 GHz nue Structure 3 GHz avec solénoïdes
Califes: vue upstream Vue downstream
In accelerators solenoids are usedFor focusing in the low energy sections: Electron guns CLIC-CTF3 Probe beam LINAC
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 65
Let’s stay at CERN: CMS (Compact Muon Solenoid)
Design compact
Basé sur un solenoïde SC
6 m de diamètre
13 m de long
Champ élevé 4T
+ culasse en fer doux
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 66
Du Virtuel au Réel : 1998-2006
Champ central : 4 T
Courant nominal : 20 kA
Energie stockée : 2,6 GJ
Masse froide
Longueur : 12,5 m
Diamètre interne : 6 m
Poids : 220 t
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 67
A few challenges of the CMS Magnet CMS
Magnetic pressure is 6.4MPaConductor 20 kA reinforced mechanically by aluminum alloyStress=
Winding in 5 modules, each of 4 layers chacun. The winding ispractised in an outer mandrel
Magnetic pressure 6.25 MPaAttraction force between modules: 6.25 MPa*20m2=12000 tons
Stores energy 11,6 kJ/kg in the cold mass
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 68
CMS conductor
Câble Supraconductor
(32 strands)
High purity aluminum for stabilisation:
99.998%Aluminum AlloyFor mechanical reinforcement:6082 T5
Electron beam welding
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 69
Manufacturing of modules (06/04)
Polymérisation CB-1
Finition CB0
Winding CB+1
outer cylinder CB+2
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 70
Assemblage de la bobine en vertical
1
2
3
45
Rings between the modules are taking the axial attraction force or 12000 tons which is just magnetic pressure (6MPa) cross the section(20 m2)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 71
Août 05 : insertion of cold mass in the vacuum vessel
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 72
Efforts on the cold mass
Stresses on CB/0 external cylinder
-40
-20
0
20
40
60
80
100
120
140
0 2 4 6 8 10 12 14 16 18 20
current, in kA
Axial stress along Z axis
Circumferential stress
Von Mises stress
Contrainte de Von Mises mesurée à 4T : 138 MPaEn accord complet avec les calculs de 1998.
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 73
Magnet
1.5T (GE) SHFJ/CEA Magnet
3.0T (Bruker) SHFJ
Magnet
9.4 T GE 600 mm (USA)
Iseult 11.7 T
Increase spatial and time resolution
1 mm1s
0.1 mm0.1s
MRI limits
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 74
MRI Magnet architecture
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 75
Main Coil compensation coil
Winding
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 76
B0 / Warm Bore 11.75 T / 900 mmField stability 0.05 ppm/hrField Homogeneity < 0.5 ppm over 22 cm DSVStray field (5 G line ) 9.6 m axial, 5.1 m radial
Stored Energy 330 MJInductance 301 HWinding Current Density 28.2 A/mm²Temperature 1.8 KCurrent 1487 A
Conductor size 9.2 mm x 4.6 mmConductor weight 60 t of NbTi
Main parameters of the ISEULT Magnet
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 77
Winding pack design
3.852 m
3.946 m1.000 m
3.852 m
3.946 m1.000 m
3.852 m
3.946 m1.000 m
For magnetic shielding anti coils are used with :
B1*S1=-B0*S0
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 78
1000G
100G
10G
5G
10 m
Rôle du blindage actif (2/2)
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 79
Winding pack design
Original Double Pancake designThe objective is to design a magnet theoretically intrinsicallyhomogeneous
Design cross-check several time
∑ ∑∞
= = ⎥⎥⎥
⎦
⎤
⎢⎢⎢
⎣
⎡
⎟⎟⎟
⎠
⎞
⎜⎜⎜
⎝
⎛
+++=1 1
0 )(cossin
cos
)(cos),,(n
n
m
mn
mn
mn
mn
nnn
z PWmY
mXPZrBrB θ
ϕ
ϕθϕθ
x
yz
O O’
2s
O’’
2s
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 80
Assembly of the double pancakes
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 81
Summary and Conclusion
James Clerk MAXWELL
« Think Flux »
Do Coilsplease
I hope I have given you a flavour the magic world of solenoids
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CERN Accelerator School (CAS) – Bruges, Belgium June 16-25, 2009 - Antoine DAËL 82
Bibliographie
CERN ACCELERATOR SCHOOL : mesures magnétiques, physique générale des accélérateurs, lumière synchrotron, supraconductivité , CASLa Bible : « Magnétostatique » de E. Durand.Martin N. Wilson : Superconducting MagnetsJack TANABE Iron Dominated ElectromagnetsPr IWASA: Case studies in Superconducting magnets