1. Magnet designs for Super-FRS and CR
Cryogenic Experts Meeting (19 ~ )
Magnet designs for Super-FRS and CR
MT/FAIR – Cryogenics and Magnets
H. Leibrock

2. Design parameters and layout of the Super-FRS
2 Stage
Multi-Branch
Super Conducting
Large-Acceptance

3. Superferric dipole of Super-FRS
PF2
Existing superferric dipole for A1900 Fragment Separator, NSCL, MSU
1.6 T, DC, large aperture
iron-dominated, warm iron

4. Requirements for the design of a dipole
The dipoles are conceived as superferric laminated magnets with warm iron yoke, warm pole, and warm beam pipe.
The magnets will run in DC mode.
The dipole should be a sector magnet (trapezoid) with sector shape coils.
Coils should be self protecting (Cu:SC ratio: 10:1 or 9:1; SC: NbTi).
Bath cooled.
All dipoles are in separated cryostats.
No liquid Nitrogen is intended for shielding.
Standard (no HTSC) current leads will be used (less than 250 ampere).

5. Main parameters for CR/Super-FRS dipole
Dipole field T
0.02
Bending angle
Degree
15 / 9.75
Curvature radius, R mm
8125 / 12500
Effective length, Leffe.
2126
Good field region
225
Pole gap height
170
Integral field quality (relative)
B=0.15 to 1.2 T: 310-4
B=1.2 to 1.6T:110-4
Laminated iron length, Liron
2020
Current, I A
246
Inductance, L H
16.8 at B=1.57T
Weight of iron body
Tons
45.5

6. FAIR collaboration in China
The FAIR China group:
The R&D work of superconducting magnets for CR and SuperFRS
The subjects of making the superconducting dipole prototype for
Super-FRS are divided into:
Design and fabrication of the yoke: IMP Lanzhou
Concept design of SC coil, cryostat: IEE Beijing
Engineering design, fabrication and testing of SC coil, including cryostat: ASIPP Hefei
Final assembly, testing and measurements: IMP and ASIPP in Lanzhou
goal: dipole prototype finished in spring 2008.

7. Opera models
the 2D quarter profile of CR dipole
the 3D model of Super-FRS dipole

8. Punching die assembly and punching sheets
The assembly for the punching die
The Punching die assembly
The first punching sheet
The Punching die installation

9. Two punching sheets: 2200mm*1450mm
The punching sheets
Two punching sheets: 2200mm*1450mm

10. End block fabricating steps
Laminated sheets
Stairs stacking and glued
After cutting

11. End block stacking and cutting tests
Stacking stair shape after glued
Fixed on vertical turning machine
Cutting by the machine
Laminated end block after cutting

12. Half yoke stacking with end block and laminated sheets in the middle part
Inserting plates
Laminated sheets
End blocks
Welding plates
End-plates

13. Half yoke stamping and welding with steel plates on 300 tons oil pressure machine

14. Coil and cryostat
lower: Oxford NbTi conductor
upper: the cross section of coil and cryostat

15. Main parameters of conductor and coil
Item
Parameters
Unit
Superconducting strands
NbTi
Oxford
Dimension of conductor
1.432.23 mm
Filament diameter df 66 m
Number of Sc filaments 55
Ratio of Cu and no Cu
10.7
RRR of Cu in core wire
133
Operating current Iop
246 A
Number of the turns
2820=560
Turn
Section size of coil
52.148.8 Mm
Cooling cubic capacity
Pool 0.05 M3
Weight of coil and cryostat
1744 Kg

16. IPP superconducting test coil fabrication

17. IPP superconducting test coil fabrication

18. Structure of thermal shield and cryostat
Cryostat consist of two main sub-assemblies;
1) A magnet cryostat housing the superconducting coil
2) Satellite cryostat with cryogenic reservoirs and connections to outside world
self protecting dipoles (Tmax < 120 K, Vmax < 200 V)

19. Superferric Multiplets for the Super-FRS
Warm bore diameter of 38 cm
Iron-dominated, cold iron
Quadrupole triplet + separated sextupoles
Octupole correction coils are embedded
Superferric Triplet
RIKEN)

20. 3d Opera model of the quadrupole
The magnet with the main coils and the octupole coils
The main parameters of the magnet are:
Yoke diameter: 1400 mm
Pole tip radius: 250 mm
Gradient quality: ±8∙10-4
Main coil:
Coil cross section: 55×50mm2
Maximum current density: 127 A/mm2
Pole tip field: 2.5 T (10 T/m)
max. coil: 4.5 T

21. 3d Opera model of sextupole
The main parameters of the magnet are:
Yoke diameter: 800 mm
Pole tip radius: 235 mm
Gradient quality: ±8∙10-4
Coil cross section: 20×20 mm2
Maximum current density: 132 A/mm2
Maximum field in the coil: 1.6 T
Maximum field at pole: 0.8 T

22. Conceptual design study of a Superferric multiplet for FAIR
Contract with Toshiba Corporation: Conceptual design
Toshiba designed quadrupole triplets for RIKEN.
Super-FRS requirements are similar

23. Conceptual design study of a superferric multiplet for FAIR

24. Cold mass support figurations

25. Status
The manufacture of the punching die of the dipole was finished. After punching sheets accuracy checking with laser tracker, the punching die has been fine-adjusted. Now IMP finished punching of all iron sheets.
IPP are fabricating the testing coil, some moulds and tools can be used for the prototype coils. IPP want to get more experiences and knowledge from the tests to define the detail design for the cryostat.
Main dimension and assembly of yoke and cryostat were confirmed.
Conceptual design of a multiplet exists
A contract for a long quadrupole prototype is prepared