  Results are presented for a simulation carried out to test the precision with
which a detector design (HERON) based on a superfluid helium target material
should be able to measure the solar pp and Be7 fluxes. It is found that
precisions of +/- 1.68% and +/- 2.97% for pp and Be7 fluxes, respectively,
should be achievable in a 5-year data sample. The physics motivation to aim for
these precisions is outlined as are the detector design, the methods used in
the simulation and sensitivity to solar orbit eccentricity.
