1. Development of the Canted Cosine Theta Superconducting Magnet
Yu Liang,Wei Wu (IMP,Lanzhou)
Sep. 13, 2017

2. Outline 0.5 m CCT Model Magnetic Design
CCT Quadrupole Magnet For CiADS Project
2.0T CCT Dipole Prototype Test

3. Inside and outside the former/ mm
0.5 m Model Parameters Compare
0.5 m CCT Design Parameter
Bore field / T
2.59
Current / A
420
Layers
5+5
CCT angle /° 30
Magnetic length / m
0.286
Turns per layer 55
Integrated field / Tm
0.755
Peak field / T
3.08
Io/Ic
55%
Slot size in former
2 mm*5 mm,0.6 mm for rib
Inside and outside the former/ mm
The first layer: 105 /118.2 ;
The second layer:118.6 /131.8
Yock diameter
570 mm
Beam Seperation
194 mm
0.5 m CERN CCT Parameter
Bore field / T
2.59
Current / A
422
Layers
5+5
CCT angle /° 30
Magnetic length / m
0.28
Turns per layer
109
Integrated field / Tm
0.73
Peak field / T
3.06
Io/Ic
55%
Slot size in former
1 mm*5 mm,0.3 mm for rib
Yoke diameter
570 mm
Beam Seperation
194 mm

4. Cross sectional dimensions
80mm
170mm
400mm
OPERA Model
194mm
Cross sectional dimensions

5. The iron magnetic field The magnet magnetic field
The peak field:3.88T
How to improve it?
The iron magnetic field
The magnet magnetic field
The peak field:3T
The coil magnetic field
B vector distribution on iron

6. The basic electromagnetic parameters meet the design requirements
Computed integral field harmonics at Rref = 35mm are less than 1 unit
The iron center is highly saturated, the field is close to 4 T, how to improve it?
Try to use the other software to design, start with 2D design
The integral field is Tm
By along the axial direction (left aperture)
The integral field is Tm
Bx along the axial direction (right aperture)

7. CCT Superconducting Quadrupole Magnet（CiADS）
The Linac Quadrupole Magnet Parameters
Parameters (Unit)
Value
Polar field (Gs)
8000
Effective length (m)
200
Operation range (Gs)
2500~8000
Aperture (mm) 50
Good field (mm)
±20
Uniformity
±5E-2
CiADS Project
Quadrupole triplet adopt superconducting design
By increasing the gradient, we can reduce magnet length
Both quadrupoles and solenoids put one cryomodule
CCT design makes the magnet more compact
Layout of The CiADS Superconducting Linac

8. Main Design Parameters of Quadrupole Magnet
The CCT quadrupole magnet assembly
Main Design Parameters of Quadrupole Magnet
Cross section of the CCT quadrupole coil
Parameter
Value
Unit
Gradient 40
T/m
Effective length
160 mm
Operation current
400 A
Winding pitch 6
Tilt angle 45
deg
Inductance 10 mH
Aperture 60
Good field
±20
Uniformity
±4E-4
CCT Quadrupole Conductor Use
Layer
Coil Type
Turns
L-all-strand (m) 1
2 × 5 28
110 2
132
Total (m)
242

9. Outer Insulated with Nylon braid
Parameters of the NbTi/Cu strand
Wire type
Monolith
Insulation
Formvar
Bare size
0.72 mm
Insulated size
0.77 mm
Outer Insulated with Nylon braid
0.9±0.005 mm
Cu/SC
1.3:1
RRR (293 K/10 K)
＞100
Ic (6 T,4.2 K)
442.7 A
Io/Ic=48%
The peak field:1.84T
The coil magnetic field
Coil Wiring Diagram
Two wires are wound at the same time by hand, with low tension.
Winding order: Inner1→Outer1→Inner2→Outer2→...→
Inner10→Outer10
Number of Joints : 19
Insulated with Nylon braid (From WST)

10. Model is start to winding cold testing is planned in October
Magnet Plan:
Model is start to winding
cold testing is planned in October
CNC machining and measurement
After anodizing and insulation test
Try a winding by hand

11. Cross section of the CCT dipole coil
2.0 T CCT Dipole Prototype Magnet
Opera model
6+1 Cable
Former groove processing, winding, assembly and vacuum impregnate
Cross section of the CCT dipole coil

12. Magnet Test Results
One quench at 2165A, about 70% of design current
The measured filed is reach 1.45 T
Ramp rate: 5A/s
Power failure and stop to test
The measured data is consistent with the design value

13. Summary
A 0.5 m model electromagnetic design of the HL-LHC CCT magnet has been done
The core of the iron is saturated. The thickness of the iron core and the spacing between the coils are to be optimized
The integral field is Tm for the 0.5 m model. The integral field harmonics are all less than 1 unit with the reference radius of 35 mm
In the IMP, 2.0 T CCT dipole prototype has finished cold test, later retest when power is repaired; 40 T/m CCT quadrupole magnet is begin to winding and plan to test in October

14. Thanks for your attention!