Physical processes of the synchrotron radiation in fusion plasma are reviewed. The problems of synchrotron energy loss are analysed in relation to the advanced fusion programs. The effect of the wall reflection is also discussed.
Self-Consistent analytical and numerical investigations to determine the excited electromagnetic fields by a high-density intense relativistic electron beam with finite radius passing through a cylindrical cavity are carried out. In contrast to the results by Grishaev and Shenderovich, our results show that the excited electric field for the dominant mode TM010 tends to a saturation limit with the increase in beam density. However, for tenuous or thin beam our results coincide with theirs.