Requirements:
  - resolution <1% up to at least 1GeV. 
  - total length <800 mm
  - limited encumbrance of the coil on the side of the fibers
To this aim both the magnetic field and the magnetic length are increased.
A tentative map is shown {{:strutture:lnf:da:plasmonx:lpa:spectrometer:mappafinale.png|mappa finale}}
and it can be achieved with the requirements described in {{:strutture:lnf:da:plasmonx:lpa:spectrometer:specifiche-magnete-finale.pdf|here}}


The rest of the detector is designed with the same logic as the v1 prototype, as shown {{:strutture:lnf:da:plasmonx:lpa:spectrometer:disegnodetfinale.png|here}}. The detector is 64 fibers longer than the v1 detector.
The expected resolution at two possibile distances of the beam from the center of the magnet is shown {{:strutture:lnf:da:plasmonx:lpa:spectrometer:resolutionfinal.png|here}}.