Astron (Christofilos)
Astron (Christofilos)
01 Executive_Summary
Nicholas Christofilos's Astron experiment at LLNL (1956-1973). Concept: E-layer — ring of relativistic electrons in magnetic mirror to achieve magnetic field reversal. Goal: create closed field lines for compact torus confinement. NEVER achieved field reversal — the fundamental goal. Beam: 100-120 A at ~4 MeV, 0.3 μs pulses. E-layer: 60 cm dia, 300-400 cm long, >1000 A circulating current. 50% particle loss in first 100 μs. E-layers stable up to 200 ms at low pressure. Axial compression by 2x observed. Failure: E-layer buildup losses + poor trapping on later pulses. Funding cancelled 1972, wound down 1973. EARLIEST CONCEPTION OF A COMPACT TORUS — class includes Spheromak and FRC. Linear induction accelerator developed for Astron — now used in many applications. T.K. Fowler co-authored (later LLNL director). Christofilos: Greek engineer, NO formal physics credentials. Presented at 1958 Atoms for Peace conference, Geneva. Lineage: Astron → Spheromak (LLNL/PPPL) and FRC (LANL).
02 Definition
A 1960s LLNL fusion experiment proposed by Nicholas Christofilos using a relativistic electron beam to create a field-reversed configuration. A direct precursor to modern FRC research.
03 Deep_Dive_Intelligence
Overview
Nicholas Christofilos's Astron experiment at LLNL (1956-1973). Concept: E-layer — ring of relativistic electrons in magnetic mirror to achieve magnetic field reversal. Goal: create closed field lines for compact torus confinement. NEVER achieved field reversal — the fundamental goal. Beam: 100-120 A at ~4 MeV, 0.3 μs pulses. E-layer: 60 cm dia, 300-400 cm long, >1000 A circulating current. 50% particle loss in first 100 μs. E-layers stable up to 200 ms at low pressure. Axial compression by 2x observed. Failure: E-layer buildup losses + poor trapping on later pulses. Funding cancelled 1972, wound down 1973. EARLIEST CONCEPTION OF A COMPACT TORUS — class includes Spheromak and FRC. Linear induction accelerator developed for Astron — now used in many applications. T.K. Fowler co-authored (later LLNL director). Christofilos: Greek engineer, NO formal physics credentials. Presented at 1958 Atoms for Peace conference, Geneva. Lineage: Astron → Spheromak (LLNL/PPPL) and FRC (LANL).
Entity Type: Experiment — Astron (Christofilos) is a scientific experiment or test program.
Technical Definition
A 1960s LLNL fusion experiment proposed by Nicholas Christofilos using a relativistic electron beam to create a field-reversed configuration. A direct precursor to modern FRC research.
Related Concepts: FRC, LLNL, Christofilos
Network Relationships
Astron (Christofilos) connects to 3 entities in the intelligence network:
Concepts (2):
- → Spheromak: Conceptual ancestor — compact torus
- ← Strong-Focusing Principle: Christofilos invented both strong focusing (1949) and Astron (1956)
Organisations (1):
- → LLNL: Hosted at LLNL (1956-1973)
Research Findings
Astron (Christofilos) appears in 5 research analysis documents:
AVCO PlasmaRadiationShield 1967:
Findings: AVCO Plasmaradiationshield 1967
Source PDF: [NASA - The Plasma Radiation Shield: Concept and Applications to Space Vehicles (1967)](/archive/AVCO_PlasmaRadiationShield_1967)
Date range: 1955-1985
Source org: NASA
Summary
This 1967 NASA contractor report, prepared by AVCO Corporation researchers Richard H. Levy and Francis W. French, explores the concept of a P...
AVCO PlasmaRadiationShield 1967:
Findings: AVCO Plasmaradiationshield 1967
Source PDF: [NASA - The Plasma Radiation Shield: Concept and Applications to Space Vehicles (1967)](/archive/AVCO_PlasmaRadiationShield_1967)
Date range: 1955-1985
Source org: NASA
Summary
This 1967 NASA contractor report, prepared by AVCO Corporation researchers Richard H. Levy and Francis W. French, explores the concept of a P...
Christofilos Astron Fusion 2011:
Findings: Christofilos Astron Fusion 2011
Source PDF: [Christofilos Astron Fusion 2011](/archive/Christofilos_Astron_Fusion_2011)
Date range: 1955-2011
Source org: LANL
Summary
Published in 2011 by researchers affiliated with Princeton University and the Albert Einstein College of Medicine, this review article chroni...
IAEA Fusion Research Vol2 1983:
Findings: IAEA Fusion Research Vol2 1983
Source PDF: [IAEA Fusion Research Vol2 1983](/archive/IAEA_Fusion_Research_Vol2_1983)
Date range: 1956-2025
Source org: LANL
Summary
This document, published by the International Atomic Energy Agency (IAEA) in 1983, contains the second volume of proceedings from the Ninth Int...
IAEA PlasmaPhysicsFusionResearchVol2 1983:
Findings: IAEA Plasmaphysicsfusionresearchvol2 1983
Source PDF: [IAEA PlasmaPhysicsFusionResearchVol2 1983](/archive/IAEA_PlasmaPhysicsFusionResearchVol2_1983)
Date range: 1956-2025
Source org: LANL
Summary
This 1983 publication from the International Atomic Energy Agency presents Volume II of the proceedings from the Ninth In...
Source Documents
Intelligence derived from 5 source documents:
- OSTI.gov — Astron Thermonuclear Reactor report (1958)
- PPPL — 'Greek Fire: Nicholas Christofilos and the Astron Project' (2011)
- Physics of Fluids 1973-74 — Christofilos, Fowler, Briggs, Stallard
- Wikipedia — Astron (fusion reactor)
- Christofilos Astron Fusion 2011
05 Related_Entities (3)
06 Research_Findings (5)
# Findings: AVCO Plasmaradiationshield 1967 **Source PDF:** `AVCO_PlasmaRadiationShield_1967.pdf` **Date range:** 1955-1985 **Source org:** NASA ## Summary This 1967 NASA contractor report, prepared by AVCO Corporation researchers Richard H. Levy and Francis W. French, explores the concept of a Plasma Radiation Shield designed to protect astronauts from solar flare-produced protons. The study concludes that using electromagnetic fields and free electrons for active shielding is theoretically
View Source PDF → NASA - The Plasma Radiation Shield: Concept and Applications to Space Vehicles (1967)# Findings: AVCO Plasmaradiationshield 1967 **Source PDF:** `AVCO_PlasmaRadiationShield_1967.pdf` **Date range:** 1955-1985 **Source org:** NASA ## Summary This 1967 NASA contractor report, prepared by AVCO Corporation researchers Richard H. Levy and Francis W. French, explores the concept of a Plasma Radiation Shield designed to protect astronauts from solar flare-produced protons. The study concludes that using electromagnetic fields and free electrons for active shielding is theoretically
View Source PDF → NASA - The Plasma Radiation Shield: Concept and Applications to Space Vehicles (1967)# Findings: Christofilos Astron Fusion 2011 **Source PDF:** `Christofilos_Astron_Fusion_2011.pdf` **Date range:** 1955-2011 **Source org:** LANL ## Summary Published in 2011 by researchers affiliated with Princeton University and the Albert Einstein College of Medicine, this review article chronicles the history of the Astron project and the career of its creator, Nicholas Christofilos, at Lawrence Livermore National Laboratory between 1956 and 1973. The document explores Christofilos's unco
View Source PDF → Christofilos Astron Fusion 2011# Findings: IAEA Fusion Research Vol2 1983 **Source PDF:** `IAEA_Fusion_Research_Vol2_1983.pdf` **Date range:** 1956-2025 **Source org:** LANL ## Summary This document, published by the International Atomic Energy Agency (IAEA) in 1983, contains the second volume of proceedings from the Ninth International Conference on Plasma Physics and Controlled Nuclear Fusion Research held in Baltimore in 1982. The papers cover a wide range of technical topics including tokamak experiments, plasma heati
View Source PDF → IAEA Fusion Research Vol2 1983# Findings: IAEA Plasmaphysicsfusionresearchvol2 1983 **Source PDF:** `IAEA_PlasmaPhysicsFusionResearchVol2_1983.pdf` **Date range:** 1956-2025 **Source org:** LANL ## Summary This 1983 publication from the International Atomic Energy Agency presents Volume II of the proceedings from the Ninth International Conference on Plasma Physics and Controlled Nuclear Fusion Research. It features technical papers on tokamak experiments, plasma heating, stellarators, and inertial confinement, detailing
View Source PDF → IAEA PlasmaPhysicsFusionResearchVol2 198307 Key_Findings
- ▸ Entity Type: Experiment — Astron (Christofilos) is a scientific experiment or test program.
- ▸ Related Concepts: FRC, LLNL, Christofilos
- ▸ → Spheromak: Conceptual ancestor — compact torus
- ▸ ← Strong-Focusing Principle: Christofilos invented both strong focusing (1949) and Astron (1956)
- ▸ → LLNL: Hosted at LLNL (1956-1973)
09 Timeline_Mentions (10)
Birth of Nicholas Christofilos
Nicholas Christofilos, the future architect of the Astron fusion project, is born in Boston to Greek parents.
personnelAstron Project Inception
Nicholas Christofilos applies for an accelerator patent, and the Astron project begins at Livermore National Laboratory focusing on relativistic electron rings.
fusion-physicsChristofilos conceives strong-focusing principle for accelerators
Patented 1950. Rediscovered by Brookhaven 1952. Revolutionized accelerators. Weapons application proposed by Wilson.
defense-programsAstron E-Layer Concept Proposed
Nicholas C. Christofilos presents the 'Astron' concept at a secret Project Sherwood meeting, proposing a closed magnetic topology created by a relativistic electron E-layer.
fusion-physicsAstron Concept Presented
Nicholas Christofilos presents his novel Astron fusion approach, using circulating beams of charged particles, to a panel of American scientists.
fusion-physicsChristofilos begins Astron experiment at LLNL
Greek engineer starts E-layer field reversal concept. Earliest compact torus conception. Presented at 1958 Geneva.
historical-contextAstron Program at LLNL
Lawrence Livermore National Laboratory operates the Astron program to achieve stable field reversal using linear induction accelerators.
fusion-physicsAstron Project Launched
The Astron project is officially launched at Livermore National Laboratory under the leadership of Nicholas Christofilos.
fusion-physicsChristofilos Astron experiment at LLNL
The Astron experiment established the field-reversed configuration geometry that prefigured modern FRC research.
historical-contextAstron Facility Expansion
A major extension is added to Building 431 at Livermore to accommodate a revamped and enlarged Astron accelerator.
fusion-physics10 FAQ
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Source_Documents 5 FILES
External_References 4 REFS
Glossary_Sources
Type: experiment
Region: main
Last updated: 2026-08-09