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The construction of the European Spallation Source (ESS) faces manychallenges from the neutron beam transport point of view: The spallation sourceis specified as being driven by a 5 MW beam of protons, each with 2 GeV energy,and yet the requirements in instrument background suppression relative tomeasured signal vary between 10$^{-6}$ and 10$^{-8}$. The energetic particles,particularly above 20 MeV, which are expected to be produced in abundance inthe target, have to be filtered in order to make the beamlines safe,operational and provide good quality measurements with low background.  We present generic neutron guides of short and medium length instrumentswhich are optimized for good performance at minimal cost. Direct line of sightto the source is avoided twice, with either the first point out of line ofsight or both being inside the bunker (20\,m) to minimize shielding costs.These guide geometries are regarded as a baseline to define standards forinstruments to be constructed at ESS. They are used to find commonalities anddevelop principles and solutions for common problems. Lastly, we report theimpact of employing the over-illumination concept to mitigate losses fromrandom misalignment passively, and that over-illumination should be usedsparingly in key locations to be effective. For more widespread alignmentissues, a more direct, active approach is likely to be needed.

Generic guide concepts for the European Spallation Source