1 detector magnet and structure for the gld detector kek hiroshi yamaoka mar. 03, ‘05
TRANSCRIPT
1
Detector magnet and Structure for the GLD Detector
KEK Hiroshi Yamaoka
Mar. 03, ‘05
2
Introduction
Yoke design・ Design against magnetic field Optimize plate thickness/length to be satisfied field uniformity. Check leakage field
・ Design against forces Self-weight, Earthquake, Magnetic force
・ Assembly with keeping good accuracy
・ Minimize support structure
・ Cable space, support structure for sub-detectors
・ Easy access to sub-detectors
・ Cost reduction
Cable
Earthquake
Self-weight
Mag. force
Solenoid Iron Yoke
BUniformity
H-Cal
EM Cal
Main Tracker
Muon Tracker
VTX
3
Boundary conditions for yoke designMagnetic Field Bc= 3 Tesla
Material: S10C(JIS) Carbon= 0.1wt%t=310MPae=205MPaallow=120MPa
Field Uniformity <2mm, <20mm
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0100
101
102
103
104
105
106
H(A
/m)
B(T)
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.00
500
1000
1500
2000
2500
3000
Per
mea
bili
ty
B(T)
Permeability
These dimensions are fixed,Coil length, yoke dimensions are changed.
Belle
Air gap for muon is 10cm.
4
Magnetic Field Calculation
Perform ANSYS calculation to optimize
Iron Yoke configuration.
・ Plenty of amount of iron
・ Minimize Z1,R1
・ Optimize Z2,R2
Solenoid magnetZ2
R2
R1
Z1
max
02
Zmmdz
Bz
Br
3T
ANSYS: Two-dimensional Static Magnetic Analysis
Air
Infinite elements
Iron
CoilMain Tracker
Input; Permeability Current density(Coil)*Material properties
Axisymmetric
5
Calculations
dz Coil-L Bmin Bmax Bc Unif(%)60 4.31 2.965 3.078 3.05 3.67170 4.32 2.966 3.077 3.049 3.60780 4.33 2.968 3.076 3.049 3.51190 4.34 2.968 3.074 3.048 3.448
100 4.35 2.97 3.073 3.047 3.352120 4.37 2.972 3.071 3.046 3.224200 4.45 2.979 3.061 3.042 2.679500 4.75 3.003 3.027 3.023 0.793550 4.8 3.005 3.025 3.017 0.661600 4.85 3.008 3.026 3.017 0.595640 4.89 3.01 3.027 3.014 0.562650 4.9 3.01 3.026 3.013 0.529660 4.91 3.009 3.027 3.013 0.595700 4.95 3.004 3.027 3.01 0.76750 5 2.999 3.028 3.006 0.958 0 100 200 300 400 500 600 700 800
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Un
ifo
rmit
y(%
)
dz(mm)
1001(%)max
min
B
BUnif
dz
Coil-L
4.25m
6
R2.05m
R1.8m
R0.4m
R1.0m
0
2mm
1
Unif.=18mm
8 layers
Iron
7 layers
max
02
Zmmdz
Bz
Br
mmdzBz
BrZ20
max
0
*Air gap=10cm
7
0 10 20 30 40 501E-4
1E-3
0.01
0.1
1
Mag
neti
c F
ield
(T)
Distance from solenoid center(m)
Fringe/Leakage fieldMagnetic field/ Flux line
0 10 20 30 40 501E-4
1E-3
0.01
0.1
1
Ma
gn
eti
c F
ield
(T)
Distance from solenoid center(m)
max
02
Zmmdz
Bz
Br
mmdzBz
BrZ20
max
0
8
Air gap=5cm, Uniformity=20mm
Air gap=1cm, Uniformity=20mm
Magnetic field/ Flux line
Magnetic field/ Flux line
Unit: Tesla
Unit: Tesla
7.4m
7.16m
Coil=L4.58m
Coil=L4.50m
9
Max. 1.8mm
Max. 90MPa<120MPa
18000tons
Fixed
Stress/deformation of End Yoke
27
2
0
2
841042
3
2
S
BFZ
= 18400tons
ANSYS: 18342tons
Symmetry is NOT defined!
10
Stress/deformation of Barrel Yoke
13300tons
FixedFixed
Max. 7mm
Max. 65MPa<120MPa
Thickness= 5cm
11
4.2mm
30
mm
4.3mm
NbTi:Cu:Al= 1:0.9:15.6
Strand diameter: 1.23mm
Filament diameter: 20m
Jc in NbTi at 5T, 4.2K: > 2750A/mm2
Ic at 5T, 4.2K: > 20300A
(For ATLAS)
Superconducting Solenoid
Cryostat Inner radius 3.72mOuter radius 4.4mHalf length 5.25m
Coil Mean radius 4.0mHalf length 4.93m
3T4576 turns
741A/mm2
5338A81.0H1.8GJStored Energy
Central magnetic field
Nominal currentInductance
# of turns(2 layers)
Current density
* Uniformity=2mm, Air gap=10cm
S uperconductor
12
0 1 2 3 4 5-40
-20
0
20
40
60
80
100
120
140
Str
ess(
MP
a)
Distance from center(m)
Circum. direction
Axial direction
Co
mp
ress
ion
Stress level in the coil
Development of High-strength Al
4.93m(Half)
R4.
0m
Support cylinder(t=50mm) Conductor
(h=30mm)
8mm
4mm
Deformation of the coil
Solenoid center
By Makida
13
- Outer vac. vessel
40mm rLtr
Ep
2
52
75.0
1
855.0
p: Buckling pressure 0.1MPa x 2(safety factor)
2000tons
Fixed Fixed
Thickness of ・ Inner vacuum vessel ・ End plateswere optimized.
Load conditions Weight of the calorimeter: 2000tons Weight of the solenoid : ~ 140tons Vacuum : 0.1MPa
Cryostat design
SUS304t =530MPa y =210MPaallow=140MPa
2000tonsFixed Fixed
Model-1
Model-2
14
118MPa<140MPa
9mm
t=40mm(Outer)
t=60mm(Inner)t=100mm(End plate)
2000tons
Fixed Fixed2000tons
Fixed Fixed
2000tons
x0.3G
Fixed Fixed
9mm
125MPa
274MPa>140MPa
15mm
t=40mmt=60mm
t=100mm
Stiffness: D
IED 12
3HeightWidthI
E: Young’s modulus
I: Moment of Inertia
Model-1 Model-2Material: SUS304
Weight of the calorimater should be supported at horizontal position. - Calorimeter is divided to several modules in the axial direction. - One module of calorimeter has to be stiff enough.
Important
15
2mm10cm 10cm 5cm 1cm
Barrel 5 layers 5 layers 5 layers 5 layersYoke End 8 layers 7 layers 7 layers 7 layers
Width(Half) 8.45m 7.7m 7.4m 7.16mWeight(Yoke) 13262tons ~12500tons ~12500tons ~12500tons
Cryostat Inner radius 3.72m 3.72m 3.72m 3.72mOuter radius 4.4m 4.4m 4.4m 4.4mHalf length 5.25m 5.0m 4.9m 4.82m
Coil Mean radius 4.0m 4.0m 4.0m 4.0mHalf length 4.93m 4.63m 4.58m 4.5m
3T 3T 3T 3T4586 turns 4306turns 4260turns 4186turns
741A/mm2 741A/mm2 741A/mm2 741A/mm2
5338A 5338A 5338A 5338A1.77GJ 1.67GJ 1.64GJ 1.62GJ
20mmUniformityAir Gap
Stored Energy
Central magnetic field
Nominal current
# of turns(2 layers)
Current density
・ Design against magnetic field Optimize iron thickness/length to be satisfied field uniformity. Leakage field
・ Design against forces Self-weight, Earthquake, Magnetic force
・ Support structure for sub-detectors
To be designed ・ Assembly with keeping good accuracy
・ Easy access to sub-detectors
・ Cost reduction
Conclusion
Almost fixed. Depends on the allowable uniformity and air gap for Muon
These are calculated roughly.Detail calculations are required.These are investigated roughly.Detail design should be done.
H-CalSolenoid
Main track
EM-CalIron Yoke Moun
R4
00
0
R4
40
0
t=50mm
2 layers
*Coil support system is not designed.
R4.
0m
Support cylinder(t=50mm) Conductor
(h=30mm)
Solenoid Magnet
16
17
力に対する支持
End Yoke
Barrel Yoke
800tons
650tonA
B
A と B をあわせた後、支持板をはめ込む
支持板
方針 ・ボルトではなく、支持材 ( 面 ) で支えるようにした ・測定器の領域を削らない
18
耐震設計
手順
入力加速度80 gal
応答加速度How much?
* 1 gal = 1 cm/sec2
1 G = 9.8 m/sec2
= 980 gal80 gal = 4.5(Intensity: 震度階 )
0.3G の静解析
260gal
Time(sec)
Acc
.(g
al)
詳細な構造検討により、健全性が確認された。