Alexander ZlobinUS Magnet Development Program

Fermi National Accelerator Laboratory

Nb3Sn SMCT task status

Updated Roadmaps: Nb3Sn Magnets

2

The updated US-MDP plan

includes two directions,

which are natural

extension of the present

Nb3Sn magnet R&D:1. Cos-theta magnets with

coil stress management

(SMCT)

2. CCT magnet development

US MDP Update to the TAC

SMCT Research Plan

3

The program plan consists of 4 tasks:

• Task 1. Development and test of a 2-layer 120-mm aperture SM coil in

a dipole mirror structure.

• Task 2. Assembly and test of a 4-layer 60-mm aperture coil with SM in

the two outermost layers in a dipole mirror structure.

• Task 3. Development, fabrication and test of a 2-layer 120-mm aperture

11 T dipole with stress management.

• Task 4. Assembly and test of a 4-layer 60-mm aperture 17 T dipole with

stress management.

Roadmap

4US MDP M4

Task 1. 2L 120-mm SM coil in a dipole mirror structure

Task 2. 4L 60-mm SM coil in the two outermost layers in a

dipole mirror structure

Task 3. 2L 120-mm aperture 11 T dipole with stress management

HTS coil tests with OD up to 120 mm

FY20 FY21 FY22 FY23

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Task 4. 4L 60-mm aperture 17 T dipole with stress management

HTS insert tests with OD up to 120 mm

HTS insert tests with OD up to 60 mm

HTS coil tests with OD up to 60 mm

Study of azimuthal stress management

Study of radial and azimuthal stress

management

Hybrid magnet design

120-mm/11 T and 60-mm/17 T dipole analysis has been

completed and feasibility demonstrated

1

MN

MX

X

Y

Z

HFM Optimization

.127E+08

.299E+08

.472E+08

.644E+08

.816E+08

.989E+08

.116E+09

.133E+09

.151E+09

.170E+09

FEB 6 2018

16:46:00

NODAL SOLUTION

STEP=3

SUB =1

TIME=3

SEQV (AVG)

DMX =.440E-03

SMN =.127E+08

SMX =.170E+09

1

MN

MX

X

Y

Z

HFM Optimization

.105E+08

.811E+08

.152E+09

.222E+09

.293E+09

.364E+09

.434E+09

.505E+09

.575E+09

.656E+09

FEB 6 2018

16:48:01

NODAL SOLUTION

STEP=3

SUB =1

TIME=3

SEQV (AVG)

DMX =.749E-03

SMN =.105E+08

SMX =.656E+09

U

NFOR

RFOR

SMCT coil technology has been demonstrated

6

Coil parts Coil winding, impregnation with epoxy and cross-section analysis

Coil part design for 3D printing at GE

• Part design is complete

• Part fabrication at GE

7

GE 3D printing scheme

Reaction-Impregnation tooling

• Modification of the MDPCT1 L3-L4 coil tooling

o block modification – increase inner radius by ~10 mm

o bottom plate modification – optimize shell-plate interface

• The number of blocks and modifications were optimized to reduce cost

8

SMCT Structure

• Structure modification

o Increase iron inner radius by ~10 mm

o Design and fabricate mirror blocks

• Structure analysis

o Magnetic analysis

o Mechanical analysis

• skin thickness optimization

9

Modified MDPCT1 structure – program cost reduction

Summary

• Cable fabrication

o 40-strand cable is available

• Coil design and procurement

o Coil design is complete

o Part procurement has started, delivery in June-July 2020

• Coil tooling design and procurement

o Design is complete

o Procurement req is waiting for Velev’s signature (needs to be signed asap!)

• Structure design modification

o Structure has been selected

o Magnetic and mechanical analysis is in progress

o Structure design modification will be done in Q3

o Procurement will start in Q4 (or in October FY21 if budget is not available)

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