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NTM’s fusion reactor is a powerful, versatile endgame energy system modeled after real tokamak designs — ring-shaped magnetic confinement chambers that fuse light nuclei into heavier ones, releasing enormous energy. Unlike the RBMK, fusion produces no long-lived radioactive waste and has no risk of a nuclear meltdown. The trade-off is substantial: the fusion reactor demands a continuous supply of rare fuel isotopes, very high electrical power for ignition, perfluoromethyl (PFM) cooling, and compressed air for the klystron. The most basic setup is a single Fusion Reactor Vessel (torus) paired with a Klystron, but advanced configurations chain multiple toruses together using Couplers, with each stage’s byproducts fueling the next — producing outputs no single-stage reactor can match.

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Components

The “torus” is the core component of the fusion reactor. It uses fuel and energy from a connected Klystron to generate plasma. The torus also requires a direct electrical supply and perfluoromethyl cooling to operate.The torus has four connection ports for external components. Devices that consume plasma energy (boilers, MHD turbines, couplers) share that energy according to port-sharing rules:
  • 1 component → 100% of energy
  • 2 components → 62.5% each
  • 3 components → 50% each
This means using multiple boilers or MHDTs increases total output despite lower per-unit share. Neutron flux output is not affected by port sharing — it remains constant across all ports regardless of how many components are attached.Both buffered electric charge and fuel levels affect working speed. If either drops below 50%, the reactor begins to throttle — burning slower and decreasing energy output. Klystron energy does not affect processing speed: too little fails to ignite the plasma; more does not accelerate the reaction.
The Klystron is the primary power source for the fusion reactor. It uses electricity and compressed air to generate klystron energy (KyU) for a connected torus. The output target must be defined in the Klystron’s GUI.The Klystron will throttle if its buffered electricity or compressed air falls below 50%. If its output falls below the torus’s minimum required ignition level, the plasma immediately extinguishes — there is no gradual throttle, just a hard cutoff.
Small and unassuming, yet the most powerful component in an advanced fusion setup. The Coupler converts outgoing plasma energy from one torus into usable klystron energy, which powers another torus. Some fuel combinations require this because their minimum ignition energy exceeds what four Klystrons could deliver.The Coupler is subject to port-sharing rules: if the torus it draws from also has boilers or MHDTs, the Coupler receives a reduced share of plasma energy.
The simplest energy-extracting component. The Fusion Boiler uses plasma energy (measured in TU/t) from the torus to boil water directly into Super Dense Steam, bypassing intermediate steam grades. Each mB of water requires 200 TU. This makes it more efficient than conventional boilers.Subject to port-sharing rules — multiple boilers each receive less energy per unit, but the total drawn from the torus increases.
The Magnetohydrodynamic Turbine generates electricity directly from plasma energy without steam or turbines. It has an innate +35% conversion bonus from TU to HE (heat energy to electrical energy). It requires perfluoromethyl cooling and has a minimum input requirement of 5 MTU/t — below this threshold, efficiency is halved.Like boilers, MHDTs are subject to port-sharing rules. Multiple MHDTs increase total extraction from the torus at the cost of per-unit share.Despite its appearance, the MHDT has no actual moving parts — the rotating copper wheel is part of its cooling system.
The Collector Chamber attaches to a torus and increases its byproduct production rate by 50%. Byproducts are extracted from the torus itself; the collector has no GUI or fluid/item ports. It does not consume plasma energy or neutron flux, so it does not affect port-sharing for other components.
The Breeding Chamber uses neutron flux from the torus to process materials. It can perform any recipe from the RBMK Irradiation Channel, plus additional recipes with liquid inputs. Neutron flux output is not affected by port-sharing rules — the flux level at each port remains constant no matter how many components are attached.

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Fuels

Fusion reactions require specific light isotopes as fuel. Different plasma reactions produce different byproducts and require increasing ignition energy:
Fuel CombinationNotes
Deuterium + TritiumClassic D-T fusion, the most accessible first-stage plasma
Deuterium + Helium-3Requires He-3 from mining or tritium breeding; higher tier
Higher-tier plasmasMay require Coupler-chained toruses for ignition; byproducts from earlier stages can fuel later ones
  • Deuterium is produced by centrifuging or electrolyzing water.
  • Tritium can be bred from lithium using a Breeding Rod irradiated in the RBMK (Lithium rod → Tritium rod, requiring 200 flux).
  • Helium-3 is a rare byproduct of higher-tier reactions or specific material processing.
Fusion produces no spent nuclear fuel — byproducts are stable or weakly radioactive isotopes. However, you still need radiation protection when handling breeding chamber outputs and certain plasma byproducts.

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Assembly Guide

The fusion reactor requires an enormous and continuous power supply. A Klystron needs both electricity (a large RF buffer) and compressed air simultaneously. Ensure you have industrial-scale power generation — batteries, turbines, or multiple RBMK boilers — before attempting to ignite plasma. Power loss mid-reaction will immediately extinguish the plasma.
1

Build the Fusion Reactor Vessel (Torus)

Place the Fusion Reactor Vessel block as the central component. This is the multi-block core where plasma is generated. Connect it to an electrical cable network and pipe in cold perfluoromethyl for cooling.
2

Install the Klystron

Place one or more Klystrons adjacent to (or connected to) the torus. In the Klystron GUI, set the output energy target to match your torus’s ignition requirement. Connect:
  • An electricity cable to the Klystron’s power input
  • A Compressed Air pipe to the Klystron’s fluid input
  • A klystron energy conduit from the Klystron’s output to the torus’s klystron input port
3

Attach Energy-Extracting Components

Connect at least one power-generating component to one of the torus’s four output ports:
  • Fusion Boiler: pipe water in, route Super Dense Steam out to turbines
  • MHD Turbine: pipe in PFM cooling, connect electrical output to your network
Remember port-sharing: two boilers each receive 62.5% of plasma energy but together extract more total power than one.
4

Optionally Add Collector or Breeding Chamber

  • Attach a Collector Chamber to increase byproduct yield by 50% (no port consumed, no energy cost).
  • Attach a Breeding Chamber to one of the four ports to irradiate materials using neutron flux. This uses a port but does not reduce plasma energy for other components.
5

Supply Fuel

Insert your fusion fuel (e.g., deuterium and tritium cells) into the torus’s fuel input slots. Ensure the fuel buffer is above 50% before attempting ignition.
6

Ignite the Plasma

With the torus powered (electricity buffer ≥ 50%), the fuel loaded, the Klystron running and outputting sufficient KyU, and PFM cooling active, the plasma will ignite automatically. Watch the torus’s GUI to confirm the reaction is running and the energy output is non-zero.
7

Build Advanced Multi-Torus Setups (Optional)

For higher-tier plasmas whose ignition energy exceeds what four Klystrons can provide:
  1. Build a second torus adjacent to the first.
  2. Connect a Coupler to one of the first torus’s ports.
  3. Route the Coupler’s klystron energy output to the second torus’s klystron input.
  4. The first torus now provides both energy and (optionally) byproduct fuel to the second torus, enabling chain fusion configurations.

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Output and Efficiency

Fusion Boiler → Super Dense Steam → Steam Turbines → HE electricity
  • Each mB of water boiled costs 200 TU of plasma energy
  • Produces Super Dense Steam directly (high-compression tier)
  • Best for large-scale power generation with existing turbine infrastructure
  • Multiple boilers increase total yield (port-sharing applies)

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