  We consider the possibility of a 120x120 GeV e+e- ring collider in the LHC
tunnel. A luminosity of 10^34/cm2/s can be obtained with a luminosity life time
of a few minutes. A high operation efficiency would require two machines: a low
emittance collider storage ring and a separate accelerator injecting electrons
and positrons into the storage ring to top up the beams every few minutes. A
design inspired from the high luminosity b-factory design and from the LHeC
design report is presented. Statistics of over 10^4 HZ events per year per
experiment can be contemplated for a Standard Higgs Boson mass of 115-130 GeV.
