The design and preliminary experimental results of a Raman regime free electron laser (FEL) using a superconducting helical wiggler with a distributed feedback (DFB) reflector are described here. The DFB reflector was an iris-loaded type with a period of 3.2 mm and was installed in the drift tube of the FEL interaction region. Using a 700 keV/20 A electron beam with a duration of 200 ns from a pulsed power machine, spontaneous radiation in the 7 mm wavelength region was observed in the absence of the DFB reflector. After installing the DFB reflector, the spectrum of radiation exhibited growth in a particular wavelength region. This indicates that the DFB reflector showed wavelength selectivity corresponding to its period.