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In page Bussard ramjet:

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The advantages of this system include:

  • The fuel pellets could use isotopes such as deuterium (hydrogen-2) or tritium (hydrogen-3).[5] A conventional Bussard ramjet will mostly collect protium (hydrogen-1), as this is the most abundant isotope of hydrogen in nature.
  • Launching only ionized fusion fuel so that either magnetic or electrostatic scoops can more easily funnel the fuel into the engine. The drawback is this will cause the fuel to disperse due to electrostatic repulsion.[citation needed]
  • Launching the fuel on a trajectory so that the fuel velocity vector will closely match the expected velocity vector of the spacecraft at that point in its trajectory. This will minimize the "drag" forces generated by the collection of fuel.[citation needed]