1
R. Gupta, M. Anerella, H. Hocker,
W. Sampson, J. Schmalzle, BNL
S. Kahn, R. Johnson, Muons, Inc.
Construction and Test Results
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 2 ASC2016 September 5, 2016
Background • Muons, Inc. and BNL team was awarded a Phase II SBIR
for developing curved HTS dipole technology for FRIB
• FRIB dropped the plans of using HTS magnets
• Muons, Inc. and BNL team adjusted the program
Muons, Inc. continued the design on the curved dipole
BNL built and tested curved coils with cryo-coolers
• Curved HTS coil technology with cryo-coolers has a
broader application
Accelerators and beam lines
Medical and industry
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 3 ASC2016 September 5, 2016
>>> Issue: Curved coil requires dealing with
negative curvature
>>> Strategy: Wind with positive curvature and
then push back on one side (common in LTS)
>>> Concern: Possible damage to HTS which is
brittle
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 4 ASC2016 September 5, 2016
Practice Winding with SS Tape (1)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 5 ASC2016 September 5, 2016
Practice Winding with SS Tape (2)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 6 ASC2016 September 5, 2016
Practice Winding with SS Tape (3)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 7 ASC2016 September 5, 2016
Practice Winding with SS Tape (4)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 8 ASC2016 September 5, 2016
Test Winding of 5-turn HTS Coil with Negative Curvature
12 mm wide HTS Tape from SuperPower 12 mm wide HTS Tape from SuperPower
250 A @ 77 K
No observable
damage seen
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 9 ASC2016 September 5, 2016
A Walk-through of Making of a HTS Coil with Negative Curvature with Computer Controlled Machine
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 10 ASC2016 September 5, 2016
Start of HTS Coil Winding
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 11 ASC2016 September 5, 2016
Filler Piece for Winding with Positive Curvature
3-d printed parts
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 12 ASC2016 September 5, 2016
Filler Piece Removed
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 13 ASC2016 September 5, 2016
One Side of the Coil Pushed for Negative Curvature
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 14 ASC2016 September 5, 2016
Negative Curvature Clamped
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 15 ASC2016 September 5, 2016
Epoxy on the Surface to Hold Shape
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 16 ASC2016 September 5, 2016
~145 turns with
SuperPower 12 mm
Second Coil Wound
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 17 ASC2016 September 5, 2016
Two
Single P
anc
akes
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 18 ASC2016 September 5, 2016
77 K Test Results Coil #1 and Coil #2
Coil doesn’t seem to degrade
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 19 ASC2016 September 5, 2016
Cryo-cooled HTS Magnet
Cooling and Cryostat Design
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 20 ASC2016 September 5, 2016
Layout of the cryo-cooled system design (from outside)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 21 ASC2016 September 5, 2016
Layout of the cryo-cooled system design (from inside)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 22 ASC2016 September 5, 2016
Assembly of HTS Coils inside
the Cryostat with Cryo-coolers
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 23 ASC2016 September 5, 2016
Coils with Insulation being Assembled in Support Structure
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 24 ASC2016 September 5, 2016
HTS Coils Getting Installed in Support Structure
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 25 ASC2016 September 5, 2016
HTS Coils Getting Installed in Cryostat
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 26 ASC2016 September 5, 2016
HTS Leads Getting Installed (Cooling fins can also be seen)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 27 ASC2016 September 5, 2016
Copper Lead Length Adjusted
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 28 ASC2016 September 5, 2016
All Structure Assembled (prior to closing of cryostat)
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 29 ASC2016 September 5, 2016
Cryo-cooled Magnet Being Tested
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 30 ASC2016 September 5, 2016
Test Results
0
50
100
150
200
250
300
0 50 100 150 200 250 300
Vo
ltag
e (m
V)
Current (A)
1st 10-turn of one coil when both coils powered
in series at ~48 K
Magnet Reached the
Expected Performance
Superconducting Magnet Division
Curved HTS Coils with Cryo-coolers Ramesh Gupta , … Slide No. 31 ASC2016 September 5, 2016
Conclusions
Construction techniques used did not cause observable
degradation in shifting HTS conductor in coils with
positive curvature to coils with negative curvature.
Curved HTS magnet cooled with cryo-coolers has been
built and tested.
The technology developed here can be useful in other
accelerator, medical, industrial and research facilities.