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Question
Why is fusion energy so hard to achieve?
Fusion requires heating fuel to over 100 million degrees and confining it well enough to produce net energy — the Lawson condition. Every fusion design is a way to meet it.
Fusion is hard because it demands several extreme conditions simultaneously: enormous temperature, good confinement, and sufficient density — summarized by the Lawson criterion. Every fusion approach is essentially a different strategy for meeting that condition affordably.
Kronos is candid about which parts remain unproven — the confinement requirement and the hot-ion posture chief among them — and tests them at its gates.
Questions & answers
Why has fusion taken so long?
Fusing nuclei requires overcoming their electrical repulsion, which means heating the fuel to over 100 million degrees — hotter than the sun's core — and then holding that plasma together long enough and densely enough to produce more energy than it took to heat it. Meeting all three conditions at once (the Lawson criterion) is genuinely hard.
What are the specific challenges?
Reaching fusion temperatures, confining the plasma without it touching any wall, sustaining it in steady state, converting the energy efficiently, and building magnets and materials that survive the environment. Kronos addresses each with high-field magnets, negative triangularity, direct energy conversion, and a low-neutron fuel.
Is it actually possible?
Yes — fusion has been achieved many times in experiments; the challenge is doing it net-positive, continuously, and economically. Kronos publishes its remaining open questions honestly and tests them at pre-registered gates rather than claiming the problem is solved.