  The Roper resonance is described in a chiral version of the chromodielectric
model as a cluster of three quarks in radial-orbital configuration
(1s)$^2$(2s)$^1$, surrounded by $\pi$ and $\sigma$-meson clouds and by a
chromodielectric field which assures quark dynamical confinement. Radial
profiles for all fields are determined self-consistently for each baryon.
Transverse $A_{1/2}$ and scalar $S_{1/2}$ helicity amplitudes for the
nucleon-Roper transition are calculated. The contribution of glueball and
$\sigma$-meson vibrations is estimated; although small for N(1440), the
$\sigma$ contribution can be large for N(1710).
