1. Future of EDIPO Meeting
MIT-PSFC Comments
MIT Plasma Science and Fusion Center future research is focused on development of very high field magnets for compact fusion reactors.
REBCO Tape – multitape cables/conductors
Conductors with currents 30 – 100 kA
Peak magnetic field T
Operating temperature near 20 K
Cooled by supercritical hydrogen
We would like to test short lengths of relevant conductors in test facilities during conductor development program
First samples available about 1 year from now
An important feature of the test is to generate Bpeak x Iop at relevant temperature and also do Lorentz force cycling.

2. High-Field, Superconductor Demountable Magnets are the Game-Changing Technology for Magnetic Fusion
ITER is example of previous state-of-art in superconductor magnets Very large size
> 2 years to replace interior shield
ARC is example of using new high-field superconductor magnets Decrease volume by factor of ten!
Modular replacement of interior
Simple liquid blanket for electricity + eliminate blanket DPA limits
Fusion power: 500 MW
Electrical power: 0 MW
Fusion power: 500 MW
Electrical power: 250 MW
Same
Science!

3. The ARC conceptual design: Fusion power at small size = Power density
B. Sorbom et al FED 2015
Replaceable
“core” module
500 MW fusion power
~200 MW electricity
~ 4 MW/m2 fusion power density
New HTS magnet at~20 T, 20 K
R=3.2 meters

4. Considered Cable Candidates
Twisted Stack Tape in Structural Plates
Twisted Stack Tape CICC
CORC & mCORC
One channel cable
3 channel cable
Structural Plates
Insulation
Copper Stabilizer
HTS Tape Stack
A. Radovinsky,09/28/2016

5. Analyzed several cable configurations
Need to do:
Cooling grading: structural strength
Quench detection
CORC
TSTC-1
TSTC-2
CICC
Cooling grading (WIP)

6. MIT-PSFC Position on Future of EDIPO:
(page 1 of 2)
The loss of EDIPO for the next few years is a large hit to the MFE program and us in particular. It was a truly unique facility.
The world's programs need the ability to do high current, high-field HTS tests, every lab has some of this going on. We should try to come up with a solution that does not delay this work.
We think we will acquire significant resources to do test through qualification in the next 2 years that will move toward significant tests in the next year.
We support the rebuilding of EDIPO over the next few years.
Suggest that if rebuilding it for the future, do it at higher field, as high as possible.
This then supports the work toward reactor relevant as a next step beyond ITER technology

7. MIT-PSFC Position on Future of EDIPO:
(page 2 of 2)
Unfortunately our near-term timelines are not well in line with the time required to rebuild EDIPO.
We would be willing to pay to help support Sultan over the next two-three years so we, and the world, has a facility to continue advanced conductor development.
We would be willing to negotiate some sort of formal agreement to formalize access to Sultan.
This requires adapting the HTS leads and transformer from EDIPO to Sultan or buiild a new system to upgrade this facility.
We are willing to assist in support and upgrade of this facility
We are willing to consider other options to assist with this project pending outcome from this meeting and further consideration at MIT.