1. EuCARD2 Magnet Status and action plan
19/09/2014
Maria DURANTE
Thanks to EuCARD2 Task 10.3 members

2. Magnet concepts under study
Starting from cable propositions from Task 10.2 :
Block / stacked tapes cable
Aligned Block design
Cosine-theta design
CCT design

3. Block with YBCO stacked tapes cable
John Himbele
JE = 400 A/mm²
Low cost cable
Woundable cable : “twist and bend” to avoid hardway bending
BUT
Non-continuous transposition of the stacked tapes  cable transposition at coil ends or between coil layers
Mechanical strength, twisted regions

4. Block with YBCO stacked tapes cable - status
2D Electromagnetic design done
3D electromagnetic design on going
Twist region configuration studies on going
FE Magnet mechanical model to be done
Winding test set up under study
tapes block transposition
twist region mechanical support

5. Aligned block with YBCO Roebel cable
Jeroen Van Nugteren
The two plots present flux path variation for insert magnet:
(left) standalone in Iron ,
(right) in 13T ideal background field
Magnetic Field [T]
Note! Yellow area is the high short sample position.
Very different from std. LTS magnets.
Percentage on Loadline [%]

6. Aligned block with YBCO Roebel cable - status
2D and 3D Electromagnetic design done
End optimization done
Mechanical model of the Roebel cable done
Tests on Roebel cable insulation and mechanical reinforcement on going
FE Magnet mechanical model to be done
Sub scale model FeaTher-M0
Aim: Quench detection & coil production
Electromagnetic Design completed
Components almost ready  End of September
At least 3 short scale models are foreseen : First SS one by the end of the year
SC Roebel cable needed for the others
HTS insert magnet proposal (EuCARD2 baseline?) : Feather-M2
CAD design ongoing

7. Cosine-Theta with YBCO or BSCCO cable
Clément Lorin
Iron yoke
5 T
YBCO Roebel cable
3.7 T
BSCCO Rutherford cable
3.7 T
HTS dipole inside FRESCA2 magnet - Lorentz forces

8. Cosine-Theta with YBCO Roebel cable - status
First cos-theta design proposal: 2 layers, 10-mm wide Roebel cable
2D Electromagnetic design done
End optimization ongoing
FE Mechanical model done
Field [T]
ET thickness [mm]
Prestress
Peak stress [MPa]
5.00
5.5
Yes
146 No
118
8.0
187
100
16.78
782
684
805
600
20.0 30
250
Show stopper: Mechanical structure for double layer cosine-theta too weak.

9. Cosine-Theta with YBCO Roebel cable - status
First cos-theta design proposal: 2 layers, 10-mm wide Roebel cable
2D Electromagnetic design done
End optimization ongoing
FE Mechanical model done  show stopper
New design proposals under study
Cos-theta 1 layer / thicker structure design
12 mm Roebel cable
Mechanical design done
Short model coil to be designed
CAD detailed design foreseen from Nov 2014
12 mm
15.5 mm
Field [T]
ET thickness [mm]
Prestress
Peak stress [MPa]
5.00
15.5
Yes
220 No 35
17.16
570
150
Seems to be achievable.

10. Activities at CEA next year

11. Spares

12. Task 10.3 SCHEDULE

13. Task 10.3 DELIVERABLE AND MILESTONES
EuCARD² Deliverable and milestones
D10.1 Conceptual study of HTS accelerator magnets (report) M18
The report must contain all key elements of the novel magnet design, considering electromagnetics, mechanical, thermal, stability and protection aspects.
MS64 YBCO magnet design report M18
MS68 Technical and economical comparison YBCO/Bi2212 magnets M36
Internal milestones proposal
IMS01 Inputs for magnet HTS design M3
IMS02 HTS magnet(s) detailed design M24
IMS03 HTS magnet(s) built M40  D10.4 for task 10.4 : Magnet Cold test M44

14. Magnet specifications
Parameter name
Symbol
Value YBCO Magnet
Value Bi-2212 Magnet
Remarks
MAGNET
Central field B0
5 T
Up to 5
at 4.2 K (20% margin on loadline)
Clear bore aperture Φb
40 mm 40
High energy LHC dipole magnet (beam size mm)
Operational temperature T
4.2 K
4.2
1.9 K also possible 77 K tests during magnet realization
Current at 20 T I
5 to 10 kA
5 to 10
Stray magnetic field
Bout
≤ 0.2 T
At border of cryostat
Magnetic multipoles at 2/3 Φb bn
5 10-4 -
Geometric
Including magnetization and persistent current (best effort)
Magnetization M
300 mT
300
Allowing fast ramping up
Straight section length L
≥200 mm
≥200
As short as possible while remaining compatible with field quality for YBCO
Magnet length LM
< 1500 mm
700 mm uniform field (Fresca2)
Grenoble test facility
Magnet outer diameter ΦM
< 99 mm () < 140 mm x 90 mm (rect)
Without yoke – Outsert candidates : FRESCA2 (100 mm) or EDIPO (143 mm x 93 mm)
CONDUCTOR
Engineering critical current density (20T, 4.2K)
JE, 20T
600 A/mm²
In strand/tape at field perpendicular to wide face
Available cable Engineering critical current density (20T, 4.2 K)
400 A/mm²
For small development magnets
Bare cable width
wcbl
10-12 mm
10-15
Provisional
Bare cable thickness at 50 MPa
tcbl mm