samuel-cohen
PERSON dossier

Samuel A. Cohen

Princeton Plasma Physics Laboratory physicist; inventor of the Princeton Field-Reversed Configuration (PFRC) for compact fusion

PERSON Fusion Research WHITE TRACK Also: Samuel Cohen, S.A. Cohen, Sam Cohen

01 Executive_Summary

Samuel A. Cohen is a physicist at Princeton Plasma Physics Laboratory (PPPL) and the inventor of the Princeton Field-Reversed Configuration (PFRC) — a compact fusion reactor concept using D-3He fuel with low neutron emissions. He holds multiple patents on FRC reactor designs, including US11322265B2 for 'Small, Clean, Steady-State Fusion Reactors' (2022). The PFRC concept aims for 1-10 MW reactors suitable for submarines, urban environments, and space propulsion. He collaborates with Princeton Satellite Systems (PSS) on the Direct Fusion Drive (DFD) rocket engine concept. PFRC experiments (PFRC-1, PFRC-2) have achieved electron temperatures >100 eV with 300 ms duration, demonstrating stability >10^4 times longer than tilt instability growth time.

03 Deep_Dive_Intelligence

Intelligence Summary: Samuel A. Cohen

Node Identity: Samuel Cohen is the inventor of the Princeton Field-Reversed Configuration (PFRC), one of the most credible compact fusion reactor concepts in the white-track (openly published) fusion ecosystem. His work at PPPL represents mainstream plasma physics research with direct applications to both terrestrial power and space propulsion.

Research:

  • Princeton Field-Reversed Configuration (PFRC)
    • Compact FRC reactor using D-3He fuel
    • Low neutron emissions (aneutronic fusion approach)
    • 1-10 MW reactor scale
    • Applications: submarines, urban environments, space propulsion
    • PFRC-1 and PFRC-2 experiments achieved:
      • Electron temperatures >100 eV
      • 300 ms duration
      • Stability >10^4 times longer than tilt instability growth time
    • PFRC-3 design (~50% larger than PFRC-2)
    • FRC has >10x higher beta than tokamaks
    • Odd-parity Rotating Magnetic Field (RMF) heating
    • HTS (High Temperature Superconductor) coils
    • Magnetic nozzle for thrust (50-20,000 km/s exhaust velocity)

Patents:

  • US11322265B2 — 'System and Method for Small, Clean, Steady-State Fusion Reactors' (2022-05-03)
    • Assignee: Trustees of Princeton University
    • Features: gas box, scrape-off-layer (SOL) widening, controllable exit orifice, ash extraction, reduced neutron emissions

Collaborations:

  • Princeton Satellite Systems (PSS): Michael Paluszek, Stephanie Thomas, Christopher Galea
  • LLNL: T.D. Rognlien
  • NASA: JPL Advanced Space Propulsion Workshop

Evidence Calibration:

  • ESTABLISHED: PPPL position, PFRC invention, patents, experimental results (PFRC-1/2)
  • ESTABLISHED: PSS collaboration on DFD, IAEA FEC 2023 publication
  • SPECULATIVE: Practical 1-10 MW reactor viability (experimental stage, not yet demonstrated at power scale)

04 Network_Linkage

Samuel Cohen connects PPPL (mainstream fusion research) to Princeton Satellite Systems (PSS) for space propulsion applications. His PFRC concept bridges compact fusion and space propulsion. His D-3He fuel approach connects him to the aneutronic fusion research community. His IAEA FEC 2023 publication places him within the mainstream fusion conference ecosystem.

05 Related_Entities (2)

Michael Paluszek
person ←
PSS collaborator on PFRC/DFD
Princeton Satellite Systems
organisation ←
Collaborating institution on DFD

05b Related_Topics (6)

Field-Reversed Configuration
usa → russia → china → japan → israel →
Compact Fusion Reactor
usa → china → israel →
Directed Energy
usa → russia → china → israel → uk → germany → france → japan →
Plasma Propulsion
usa → russia → china → japan →
Patent Analysis
usa →
Personnel
usa → russia → china → israel → japan → uk → france → germany →

06 Research_Findings (1)

Finding

Cohen PFRC patents, IAEA FEC 2023 paper, DFD concept, PFRC-1/2 experiments

07 Key_Findings

  • ▸ Princeton Field-Reversed Configuration (PFRC)
  • ▸ Compact FRC reactor using D-3He fuel
  • ▸ Low neutron emissions (aneutronic fusion approach)
  • ▸ Applications: submarines, urban environments, space propulsion
  • ▸ PFRC-1 and PFRC-2 experiments achieved:

09 Timeline_Mentions (1)

2002

Princeton PFRC Experiment Begins

PFRC begins at PPPL by Samuel Cohen. Uses rotating magnetic fields. Enables DFD propulsion. Descends from LANL FRX.

Fusion Physics
View Full Timeline → View on Network Graph →

10 FAQ

Who is Samuel A. Cohen? ▾
Identity: Samuel Cohen is the inventor of the Princeton Field-Reversed Configuration (PFRC), one of the most credible compact fusion reactor concepts in the white-track (openly published) fusion ecosystem. His work at PPPL represents mainstream plasma physics research with direct applications to both terrestrial power and space propulsion.
What role does Samuel A. Cohen play in the research network? ▾
Samuel A. Cohen is classified under the "Fusion Research" category, serving as Princeton Plasma Physics Laboratory physicist; inventor of the Princeton Field-Reversed Configuration (PFRC) for compact fusion, belonging to the WHITE_TRACK vertical group. Samuel Cohen connects PPPL (mainstream fusion research) to Princeton Satellite Systems (PSS) for space propulsion applications. His PFRC concept bridges compact fusion and space propulsion. His...
What evidence supports the Samuel A. Cohen assessment? ▾
The intelligence assessment for Samuel A. Cohen is supported by 2 primary sources and 1 research finding. Key sources include "US11322265B2 - PFRC Patent" and "The Princeton FRC (PFRC) for Compact Nuclear Fusion Power Plants (IAEA FEC 2023)". These documents provide the evidentiary basis for the analysis.
How does Samuel A. Cohen connect to other entities in the network? ▾
Samuel A. Cohen is connected to 2 entities in the intelligence network, including Michael Paluszek (person) and Princeton Satellite Systems (organisation). Key relationships: Michael Paluszek: PSS collaborator on PFRC/DFD ; Princeton Satellite Systems: Collaborating institution on DFD. Samuel Cohen connects PPPL (mainstream fusion research) to Princeton Satellite Systems (PSS) for space propulsion applications. His PFRC concept bridges compact fusion and space propulsion. His...
What is Samuel A. Cohen's background and expertise? ▾
Identity: Samuel Cohen is the inventor of the Princeton Field-Reversed Configuration (PFRC), one of the most credible compact fusion reactor concepts in the white-track (openly published) fusion ecosystem. His work at PPPL represents mainstream plasma physics research with direct applications to both terrestrial power and space propulsion.
What organizations is Samuel A. Cohen affiliated with? ▾
Samuel A. Cohen is connected to 1 organization: Princeton Satellite Systems (Collaborating institution on DFD).
What research is Samuel A. Cohen associated with? ▾
Samuel A. Cohen is documented in 2 source documents, including "US11322265B2 - PFRC Patent" and "The Princeton FRC (PFRC) for Compact Nuclear Fusion Power Plants (IAEA FEC 2023)".
What research findings mention Samuel A. Cohen? ▾
Samuel A. Cohen appears in 1 research analysis document, including "Cohen PFRC Patents + PSS Staff Bios + Chase/UnLAB Deep + Sonny White/LSI Warp". Cohen PFRC patents, IAEA FEC 2023 paper, DFD concept, PFRC-1/2 experiments
How does Samuel A. Cohen fit into the broader intelligence network? ▾
Samuel Cohen connects PPPL (mainstream fusion research) to Princeton Satellite Systems (PSS) for space propulsion applications. His PFRC concept bridges compact fusion and space propulsion. His D-3He fuel approach connects him to the aneutronic fusion research community. His IAEA FEC 2023 publication places him within the mainstream fusion conference ecosystem.
What are the alternative names or aliases for Samuel A. Cohen? ▾
Samuel A. Cohen is also known as: Samuel Cohen, S.A. Cohen, and Sam Cohen. These alternative names appear across different source documents and may reflect codenames, abbreviations, or historical references.
What external sources document Samuel A. Cohen? ▾
Samuel A. Cohen is documented by 2 external sources, including 1 patent and 1 conference paper. Notable references include "US11322265B2 - PFRC Patent" and "The Princeton FRC (PFRC) for Compact Nuclear Fusion Power Plants (IAEA FEC 2023)".
What is the historical timeline for Samuel A. Cohen? ▾
Samuel A. Cohen is referenced across documents spanning 2022–2023, with activity noted in 2022 and 2023. This temporal range is derived from the primary source documents in the research archive.

Verified_Primary_Sources 2 SOURCES

primary innovation.pppl.gov patent
US11322265B2 - PFRC Patent
External Link ↗
primary conferences.iaea.org conference_paper
The Princeton FRC (PFRC) for Compact Nuclear Fusion Power Plants (IAEA FEC 2023)
External Link ↗
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ID: samuel-cohen
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