Aberration corrected ultraviolet echelle spectrographs: straw man designs and performance

The Far Ultraviolet (FUV: hereafter 900-1150 A) is a spectral range which contains many of the ground state transitions of common elements but has had limited observational capabilities due to the unique technological requirements to operate in this waveband. Conceptual designs are presented, for high resolution (R>50,000) echelle spectrographs for CubeSat, SMEX and MIDEX missions, along with comparisons of their performance to past instruments.