# Helion Energy

Helion Energy, Inc. is an American fusion research company, located in Everett, Washington. They are developing a magneto-inertial fusion technology to produce helium-3 and fusion power via aneutronic fusion, which could produce low-cost clean electric energy using a fuel that can be derived exclusively from water.

## History

The company was founded in 2013 by David Kirtley, John Slough, Chris Pihl, and George Votroubek. The management team won the 2013 National Cleantech Open Energy Generation competition and awards at the 2014 ARPA-E Future Energy Startup competition, were members of the 2014 Y Combinator program, and were awarded a 2015 ARPA-E ALPHA contract, "Staged Magnetic Compression of FRC Targets to Fusion Conditions".
In 2022, the company was one of five finalists for the 2022 GeekWire Awards for innovation of the year, specifically for fusion energy start up category.
In 2023, the company was one of five finalists for the 2023 GeekWire Best workplaces of the year.
On May 10, 2023, Helion Energy announced that Microsoft will become the first customer of Helion Energy, and Helion Energy will provide fusion power to Microsoft starting in 2028.

## Technology

This system is intended to operate at 1 Hz, injecting plasma, compressing it to fusion conditions, expanding it, and recovering the energy to produce electricity. The pulsed-fusion system that is used is theoretically able to run 24/7 for electricity production. Due to its compact size, the systems may be able to replace current fossil fuel infrastructure without major needs for investment.

### Fuel

Helion uses a combination of deuterium and $^3$ He as fuel. Deuterium and $^3$He allows mostly aneutronic fusion, releasing only 5% of its energy in the form of fast neutrons. Commercial $^3$He is rare and expensive. Instead Helion produces $^3$He by deuteron–deuteron (D–D) side reactions to the deuterium – $^3$He reactions. D–D fusion has an equal chance of producing a $^3$He atom and of producing a tritium atom plus a proton. Tritium beta decays into more $^3$He with a half-life of 12.32 years. Helion plans to capture the $^3$He produced this way and reuse it as fuel. Helion has a patent on this process.

### Confinement

This fusion approach uses the magnetic field of a field-reversed configuration (FRC) plasmoid (operated with solid state electronics derived from power switching electronics in wind turbines) to prevent plasma energy losses. An FRC is a magnetized plasma configuration notable for its closed field lines, high beta and lack of internal penetrations.

### Compression

Two FRC plasmoids are accelerated to velocities exceeding 300 km/s with pulsed magnetic fields which then merge into a single plasmoid at high pressure. Published plans target compressing fusion plasmas to 12 tesla (T).

### Energy generation

Energy is captured by direct energy conversion that uses the expansion of the plasma to induce a current in the magnetic compression- and acceleration – coils. Separately it translates high-energy fusion products, such as alpha particles directly into a voltage. $^3$He produced by D–D fusion carries 0.82 MeV of energy. Tritium byproducts carry 1.01 MeV, while the proton produces 3.02 MeV.
This approach eliminates the need for steam turbines, cooling towers, and their associated energy losses. According to the company, this process also allows the recovery of a significant part of the input energy at a round-trip efficiency of over 95%

### Development history

The company's Fusion Engine is based on the Inductive Plasmoid Accelerator (IPA) experiments performed from 2005 through 2012. These experiments used deuterium–deuterium fusion, which produced a 2.45 MeV neutron in half of the reactions. The IPA experiments claimed 300 km/s velocities, deuterium neutron production, and 2 keV deuterium ion temperatures. Helion and MSNW LLC published articles describing a deuterium–tritium implementation that is the easiest to achieve but generates 14 MeV neutrons. The Helion team published peer-reviewed research demonstrating D–D neutron production in 2011.

#### 4th prototype, 'Grande'

In 2014, according to the timeline on the company website, Grande, Helion's 4th fusion prototype, was developed to test high field operation. Grande achieves magnetic field compression of 4 tesla, forms cm-scale FRCs, and reaches plasma temperatures of 5 keV. Grande outperforms any other private fusion company.
In 2015, Helion demonstrated the first direct magnetic energy recovery from a subscale pulsed magnetic system, utilizing modern high-voltage insulated gate bipolar transistors to recover energy at over 95% round-trip efficiency for over 1 million pulses. In a smaller system, the team demonstrated the formation of more than 1 billion FRCs.

#### 5th prototype, 'Venti'

In 2018, the 5th prototype, "Venti" had magnetic fields of 7T and at high density, an ion temperature of 2 keV. Helion detailed D–D fusion experiments producing neutrons in an October 2018 report at the United States Department of Energy's ARPA-E's annual ALPHA program meeting. Experiments that year achieved plasmas with multi-keV temperatures and a triple product of 6.4 × 10$^{18}$ keV·s/m$^3$.

#### 6th prototype, 'Trenta'

In 2021, the firm announced that after a 16-month test cycle with more than 10,000 pulses, its sixth prototype, Trenta, had reached 100 million degrees C, the minimum temperature where a commercial generator could run. Magnetic compression fields exceeded 10 T, ion temperatures surpassed 8 keV, and electron temperatures exceeded 1 keV. The company further reported ion densities up to 3 × 10$^{22}$ ions/m$^3$ and confinement times of up to 0.5 ms.

#### 7th prototype, 'Polaris'

Helion's seventh-generation prototype, Project Polaris has been in development since 2021, with completion expected in 2024. The device is expected to increase the pulse rate from one pulse every 10 minutes to one pulse per second for short periods. This prototype is expected to be able to heat fusion plasma up to temperatures greater than 100 million degrees C. Polaris is planned to be 25% larger than Trenta to ensure that ions do not damage the vessel walls.

#### 8th prototype

As of January 2022, an eighth iteration was in the design stage.

#### Overview

| Prototype | Year developed | Notable features | Achievements |
| Inductive Plasmoid Accelerator (IPA) experiments | 2005–2012 | Deuterium–deuterium fusion | Achieved 300 km/s velocities, deuterium neutron production, and 2 keV deuterium ion temperatures. |
| Grande (4th) | 2014 | High field operation, magnetic field compression of 4 tesla, forms cm-scale FRCs, plasma temperatures of 5 keV | Outperformed any other private fusion company at the time. Demonstrated the first direct magnetic energy recovery from a subscale pulsed magnetic system with over 95% round-trip efficiency for over 1 million pulses. |
| Venti (5th) | 2018 | Magnetic fields of 7 T, high-density ion temperature of 2 keV | Detailed D–D fusion experiments producing neutrons. Achieved plasmas with multi-keV temperatures and a triple product of 6.4 × 10$^{18}$ keV·s/m$^3$. |
| Trenta (6th) | 2021 | Magnetic compression fields over 10 T, ion temperatures over 8 keV, electron temperatures over 1 keV | Achieved 100 million degrees C after a 16-month test cycle with more than 10,000 pulses. Reported ion densities up to 3 × 10$^{22}$ ions/m$^3$ and confinement times of up to 0.5 ms. |
| Polaris (7th) | Under development in 2021, expected completion in 2024 | Expected to increase the pulse rate to one pulse per second for short periods, heat fusion plasma up to temperatures greater than 100 million degrees C, 25% larger than Trenta | Still under development |
| Ursa Major(8th prototype) | Under design in 2022 | Expected to be twice the size of Polaris | Still under design |

## Funding

Helion Energy received $7 million in funding from NASA, the United States Department of Energy and the Department of Defense, followed by $1.5 million from the private sector in August 2014, through the seed accelerators Y Combinator and Mithril Capital Management.
In 2021, the company was valued at three billion dollars. As of late 2021, investment totaled $77.8M. In November 2021, Helion received $500 million in Series E funding, with an additional $1.7 billion of commitments tied to specific milestones. The funding was mainly led by Sam Altman, CEO of OpenAI, who is also the executive chairman of Helion.

## Criticism

Retired Princeton Plasma Physics Laboratory researcher Daniel Jassby mentioned Helion Energy in a letter included in the American Physical Society newsletter Physics & Society (April 2019) as being among fusion start-ups allegedly practicing "voodoo fusion" rather than legitimate science. He noted that the company is one of several that has continually claimed "power in 5 to 10 years, but almost all have apparently never produced a single D–D fusion reaction". However, Helion published peer-reviewed research demonstrating D–D neutron production as early as 2011 and according to the independent JASON review team, VENTI, a sub-scale prototype Helion developed partially for the ALPHA program, achieved initial results of 8 × 10$^{22}$ ions/m$^3$, 4 × 10$^{−5}$ seconds energy confinement time and a temperature of 2 keV in 2018. In 2020 Helion was the first private company to successfully demonstrate thermonuclear fusion plasmas exceeding 9 keV with expected D–D fusion reactions and neutrons and a triple product greater than 1 × 10$^{20}$ keV·s/m$^3$, Lawson criterion.
The same 2018 MITRE/JASON report, commissioned by the US Department of Energy's ARPA-E, said that Helion project leads or literature stated that they need a 40 tesla magnetic field for commercial viability, had the capability for an 8 Tesla field in their prototype, and projected they would achieve breakeven in 2023. The report stated that the primary challenge with Helion's approach is "whether they can simultaneously achieve sufficiently high compression while maintaining plasma stability". As of 2023, their prototype has a 10 tesla field and they project breakeven in 2024.