Entity
Lawson Machine 26 (LM26)
LM26 is a magnetized target fusion experiment that achieved electron temperatures above 1 keV using compressional heating via a collapsing lithium liner, validated by both Thomson scattering and X-ray diode diagnostics.
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## Overview
Lawson Machine 26 (LM26) is a magnetized target fusion (MTF) experiment designed to demonstrate compressional heating of plasma using a collapsing solid lithium liner (arXiv:2610.11769, October 9, 2026). The device compresses a spherical tokamak plasma inside an initially 1.76 m diameter solid lithium liner, imploded by theta-pinch coils (arXiv:2610.11890, October 9, 2026).
## Recent Results
In the LMC-12 compression shot, a Thomson scattering diagnostic measured an electron temperature of 1090 ± 40 eV with high confidence (arXiv:2610.11769, October 9, 2026). A separate measurement using filtered X-ray diodes reported a peak electron temperature of 1180 ± 65 eV, supported by the adjacent Thomson scattering results (arXiv:2610.11890, October 9, 2026). The deuterium ion temperature was inferred from neutron yield to be 459 ± 33 eV (arXiv:2610.11890, October 9, 2026).
Radial compression by a factor of 2.75 reportedly increased electron temperature over fivefold, while ion temperature increased as much as twofold (arXiv:2610.11890, October 9, 2026).
## Diagnostics
The LM26 Thomson scattering diagnostic can measure temperature during compression at 8 times and 2 spatial points. Access limitations restricted the design to narrow f/30 views (arXiv:2610.11769, October 9, 2026).
## Strategic Significance
LM26 represents a milestone in magnetized target fusion, crossing the 1 keV electron temperature threshold—a key benchmark in the broader fusion energy development race. Multiple independent diagnostic methods (Thomson scattering and X-ray diodes) corroborating similar temperatures strengthens confidence in the result, which may attract continued investment and scrutiny from the fusion energy sector.