260keV vs 3.6KeV for how long? If they are collocated for any time they must eventually thermalize, and no external B field can stop that. Per Rider: Eq 3.77, pg 123
Rider does address application of external fields, in that he points out that any external field cannot effect the entropy, It is the entropy that forces the x-ray loss. One can not move energy from fast ions to slow ions via the same field.
