Blog Posts

Thomson scattering

Thomson scattering is the industry standard diagnostic for measuring electron temperature, typically requiring, large, expensive, custom lasers. We are fortunate that ARPA-E has funded a team from Oakridge National Laboratory to build a portable Thomson system from commercial parts, and they are now installing and calibrating the diagnostic on the PFRC-2!

These measurements will give us critical insight on the plasma temperatures we are achieving with RMFo as a function of input power!

The ARPA-E Energy Summit May 24-27

Princeton Fusion Systems will have two booths at the virtual ARPA-E Energy Innovation Summit on May 24-27. One will be for our ARPA-E OPEN 2018 grant and the other for our recent awarded GAMOW power electronics grant. We’ll be at our booths, along with our team members from the National Renewable Energy Laboratory, PPPL, United SiC and Princeton University, from 1:15 to 2:30 on Monday, 3:45 to 5:00 on Tuesday and 2:30 to 4:00 on Wednesday. Please come by to talk!

We’ll also be doing a Tech Demo: Next-Generation PFRC on Monday, May 24, 2021 2:05 p.m. – 2:15 p.m.​​​​​​​ You’ll find out about our innovative compact nuclear fusion reactor work.

The Summit will have all sorts of cutting edge technology from ARPA-E companies. There will be many interesting speakers including Secretary Jennifer Granholm and Secretary Pete Buttigieg. The Summit will also include breakout sections where you can meet other attendees.

The ARPA-E Summit is the energy event of the year. Don’t miss out!

Princeton Fusion Systems Awarded $1.1 Million from ARPA-E for Transformational Energy Technology

Princeton Fusion Systems announced today that it was awarded $1.1 million in funding from the U.S. Department of Energy’s Advanced Research Projects Agency-Energy (ARPA-E). The funding will be used to develop advanced power electronics for the heating and control of fusion plasmas.

Princeton Fusion Systems received this competitive award from ARPA-E’s Galvanizing Advances in Market-aligned fusion for an Overabundance of Watts (GAMOW) program, working to close multiple fusion-specific technological gaps that will be needed to connect a net-energy-gain “fusion core,” once it is ready, to a deployable, commercially attractive fusion system. Princeton Fusion Systems joins 13 other teams in the $29M GAMOW program.

The team consists of Princeton Fusion Systems, Princeton University, the National Renewable Energy Laboratory and United Silicon Carbide. Over the 30 month duration of the contract, the team will develop efficient, high-power electrical drivers for plasma heating, compression, and control. Wide-bandgap (WBG) semiconductor devices and innovative amplifiers may speed up the development of fusion systems and reduce their eventual cost of electricity. Princeton Fusion Systems will develop prototype, high efficiency switching amplifiers using WBG SiC devices and amplifier boards that employ advanced cooling and digital control. The project will design, test, and qualify individual circuit boards as the building blocks for various short-pulse, long-pulse, and continuous-wave electrical-driver power supplies for fusion-energy systems.

Portable Diagnostic: from ORNL to PPPL

Our team is mentioned in this press release from ORNL about the “traveling” high-temperature plasma diagnostic they are building:

The ORNL diagnostic team
The ORNL diagnostic team

ARPA-E is supporting the development of several such portable diagnostics in tandem with their other fusion efforts, including our OPEN project. The ORNL team hopes that their “suitcase Thomson scattering” diagnostic will be on its way to us this summer!

When installed, it will measure the electron temperature and density profiles in the PFRC-2 experiment as a function of radius, as often as once per millisecond. The profiles measured will allow us to probe the internal structure of the plasma, but beyond that will also allow us to better interpret the results of our other diagnostics!

Princeton Propeller Talk

Princeton Propeller is a series of talks supported by the Princeton Area Alumni Association (PA3) to showcase technical innovation. Our team was recently invited to give a talk on the new frontier of commercial fusion development! Dr. Swanson and Ms. Thomas took the podium on February 11, 2020, at the Quadrangle Club on Princeton’s campus.

Download our slides at this link:
“Frontiers in Commercializing Fusion Development” Slides

We are now joined by over a dozen private companies in the UK and the US pursuing commercial fusion development. Recent programs in the Department of Energy and their ARPA-E advanced projects division have supported teams in magneto-inertial confinement (ALPHA), compact tokamaks, pinches, and our PFRC (OPEN), and public-private partnerships between labs and the private companies (INFUSE). It’s a great time to be in fusion research!

PFRC-2 Posters at APS Division of Plasma Physics

We have been hard at work on our ARPA-E project and just submitted our second quarterly report! Our team, including our summer interns, presented several posters on the latest PFRC-2 experimental results at the APS Division of Plasma Physics meeting, held Oct. 21-25 in Ft. Lauderdale, FL.

Plasma & Fusion Session

  • Neutral density measurements on the PFRC-2, Eugene S. Evans et al., UP10.101
  • Spectroscopic Line Ratio Determination of Electron Density, Electron Temperature, and H2 Dissociation Fraction in PFRC-2 Pulsed Hydrogen Plasmas, E. Palmerduca & S. Punjabi-Vinoth, et al, UP10.102
  • Recent X-ray results from the PFRC-2 experiment, C. Swanson et al, UP10.100
  • Visible light imagining of low frequency oscillations in the PFRC, P. Jandovitz et al, UP10.96

Undergraduate Research Session

  • Floating Potentials of End Plates in the PFRC-2 Divertor Regions, J. Cohen et al, JP10.33
  • Neutral gas inventory in the PFRC-2 during RMF plasma heating, K. R. Torrens et al, JP10.49
  • A study of RMF-plasma coupling on varying seed plasma parameters, G. Jusino et al, JP10.40