Tore Supra experiments are at present devoted to the study of high density regimes with radiofrequency heating. Recently, an improved L mode confinement regime has been observed in plasmas heated by ion cyclotron hydrogen minority heating, at relatively high densities up to80% of the Greenwald limit. The quality of energy confinement is as good as that of ELMy H mode.The main physical mechanism of this regime has not been clearly identified. However, some featuresvery similar to those of previous improved confinement modes using neutral beam heating in othertokamaks have been observed.