Sealing materials are formed in a reliable manner without the occurrence of peeling-off thereof. The support rack is made in the form of a U-shape having opposite ends forming end plates that extend high upwards. The superlattice material is comprised of a plurality of sublayers which effectively create a graded band gap and multi-band gap for the superlattice material. In the lowered position, a base frame of the frame arrangement is lifted from the ground such that the only the front and rear wheel assemblies contact the ground to provide transportation of the fitting stand when either loaded or unloaded. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.