SPARC (tokamak)

Experimental fusion reactor

42°32′37″N 71°37′38″W﻿ / ﻿42.5437°N 71.6271°W﻿ / 42.5437; -71.6271

This article is about the tokamak. For the processor architecture, see SPARC. For other uses, see SPARC (disambiguation).

SPARCSoonest/Smallest Possible ARC

Device type| Tokamak
Location| Devens, Massachusetts, United States
Affiliation| Commonwealth Fusion Systems
MIT Plasma Science and Fusion Center
Technical specifications
Major radius| 1.85 m
Minor radius| 0.57 m
Plasma volume| 20 m3
Magnetic field| 12.2 T
Heating power| 25 MW
Fusion power| (140 MW)
Discharge duration| (10 s)
Plasma current| (8.7 MA)
Plasma temperature| (80×106 K)
History
Date(s) of construction| 2021–present
Year(s) of operation| 2026 (projected; first plasma)

SPARC is a tokamak under development by Commonwealth Fusion Systems (CFS) in collaboration with the Massachusetts Institute of Technology (MIT) Plasma Science and Fusion Center (PSFC).[1] Funding has come from Eni,[2] Breakthrough Energy Ventures, Khosla Ventures, Temasek, Equinor, Devonshire Investors, and others.[3]

SPARC plans to verify the technology and physics required to build a power plant based on the ARC fusion power plant concept.[1] SPARC is designed to achieve this with margin in excess of breakeven and may be capable of achieving up to 140 MW of fusion power for 10 second bursts despite its relatively compact size.[2][1]

The project is scheduled to start operations in 2026, with the goal of demonstrating net power (Q > 1) in 2027.[4] It was previously scheduled for operation in 2025[5][6] after completing a magnet test in 2021.[7][8]

## History

[edit]

The SPARC project was announced in 2018 with a planned completion in 2025.[5] The name was chosen as an abbreviation of "Smallest Possible ARC", where ARC stands for "affordable, robust, compact".[9] In March 2021, CFS announced that it planned to build SPARC at its campus in Devens, Massachusetts.[10]

Construction site in May 2023

In September 2021, the project successfully tested a prototype toroidal high-field coil, achieving a record for high-temperature superconducting magnets, with a field strength of 20 T at the temperature of 20 K.[11]

In November 2024, a prototype of the reactor's central solenoid was demonstrated, and the building housing SPARC in Devens was largely completed, with assembly of the SPARC tokomak in early stages.[4]

## Technology

[edit]

SPARC uses yttrium barium copper oxide (YBCO) high-temperature superconducting magnets that retain superconductivity at temperatures as high as 77 K (optimally at 10 K).[12] The resulting plasmas are expected to generate at least twice as much energy as is required to sustain themselves at high temperatures (200 million K),[13] giving a fusion gain Q > 2, with an expected Q ≈ 11.[1]

## See also

[edit]

* ITER
* HH70

## References

[edit]

1. ^ a b c d Creely, A. J.; Greenwald, M. J.; Ballinger, S. B.; Brunner, D.; Canik, J.; Doody, J.; Fülöp, T.; Garnier, D. T.; Granetz, R.; Gray, T. K.; Holland, C. (2020). "Overview of the SPARC tokamak". Journal of Plasma Physics. 86 (5). Bibcode:2020JPlPh..86e8602C. doi:10.1017/S0022377820001257. hdl:1721.1/136131. ISSN 0022-3778.
2. ^ a b "MIT and newly formed company launch novel approach to fusion power". MIT News. Massachusetts Institute of Technology. Retrieved 2018-06-15.
3. ^ Rathi, Akshat (26 September 2018). "In search of clean energy, investments in nuclear-fusion startups are heating up". Quartz. Retrieved 2020-09-29.
4. ^ a b Crownhart, Casey (1 October 2024). "Inside a fusion energy facility". MIT Technology Review. Retrieved 3 November 2024.
5. ^ a b "Commonwealth Fusion Systems raises $115m". The Boston Globe. Retrieved 2022-03-05.
6. ^ Lavars, Nick (2021-09-09). "World's strongest fusion magnet brings new power to nuclear pursuit". New Atlas. Retrieved 2021-09-09.
7. ^ "Validating the physics behind the new MIT-designed fusion experiment". MIT News. Massachusetts Institute of Technology. 29 September 2020. Retrieved 2020-09-30.
8. ^ Fountain, Henry (2020-09-29). "Compact Nuclear Fusion Reactor Is 'Very Likely to Work,' Studies Suggest". The New York Times. ISSN 0362-4331. Retrieved 2020-09-29.
9. ^ MIT's Pathway to Fusion Energy (IAP 2017) - Zach Hartwig, 6 February 2017, retrieved 2024-02-12
10. ^ Chesto, Jon (2021-03-03). "MIT energy startup homes in on fusion, with plans for 47-acre site in Devens". The Boston Globe. Retrieved 2021-03-03.
11. ^ "MIT-designed project achieves major advance toward fusion energy". MIT News. Massachusetts Institute of Technology. 8 September 2021. Retrieved 2021-09-09.
12. ^ Clery, Daniel (2021-03-03). "Fusion startup plans reactor with small but powerful superconducting magnets". Science. AAAS. Retrieved 2021-06-14.
13. ^ "MIT Validates Science Behind New Nuclear Fusion Reactor Design". www.greentechmedia.com. Archived from the original on 22 October 2020.

## External links

[edit]

* Official website
* SPARC on CFS site

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