Since ions are charged, they should produce synchrotron radiation in an accelerator. I am interested the characteristics of the emitted radiation when there are still electrons in the ion's shell (not just fully stripped nuclei). If the ion has $n$ remaining electrons in its shell, is it the sum of $n$ times the synchrotron radiation of a single electron (plus the synchrotron radiation of the nucleus, which is probably negligible) or is the ion to be considered as a whole? If the latter is the case I'd expect the synchrotron radiation to be strongly suppressed because of the large total mass of the ion compared to the masses of the electrons.
EDIT: The Relativistic Heavy Ion Collider is a good example that I just found. The linked Wikipedia article describes the acceleration process as follows:
(...) Gold nuclei leaving the EBIS have a kinetic energy of 2 MeV per nucleon and have an electric charge Q = +32 (32 of 79 electrons stripped from the gold atom). The particles are then accelerated by the Booster Synchrotron to 100 MeV per nucleon, which injects the projectile now with Q = +77 into the Alternating Gradient Synchrotron (AGS), before they finally reach 8.86 GeV per nucleon and are injected in a Q = +79 state (no electrons left) into the RHIC storage ring (...)
The Gold ions still have electrons left in their shell while they are accelerated to relativistic speeds. Each time when they are transfered to another stage they emit synchrotron radiation when the beam is bent (even though this is probably an undesired side effect in this case). Before they are completely stripped away, do the remaining electrons influence the emitted radiation?