Time-resolved measurements of multiply charged ions in an EBIT including excitation by LCLS x-rays pulses
Final Report Abstract
Time resolution offers new insights into various problems in the physics of highly charged ions. For a study of wave function composition and its susceptibility to external magnetic fields, the magnetic-field dependent occurrence of a J=0-0 transition (usually strictly forbidden) in Fe XVII was to be measured in an electron beam ion trap (EBIT) via atomic lifetimes in the microsecond range. Shortage of funding at the host group has prevented new measurements of this case, but a re-evaluation of an older measurement is in the works. A prominent pair of 3d levels in the same atomic system (the 3C/3D problem) has given some answers and raised new questions in an experiment performed (helped by previous DFG funding) at the Linac Coherent Light Source (LCLS) at SLAC (Stanford, CA, USA) using a traveling EBIT jointly run by a MPI–K Heidelberg and Lawrence Livermore National Laboratory (LLNL) team. For this system, excitation by adjustable pairs of intense x-ray pulses with an arrival time difference on the scale of dozens of femtoseconds was tried, but has found the present LCLS light pulse to be insufficiently powerful, falling short by about one order of magnitude. Further Livermore EBIT measurements have concerned astrophysics and have helped to clarify the interpretation of the Solar Dynamics Observatory observations as well as assessing the quality of certain spectral models employed in observational and laboratory astrophysics.
Publications
- Appl. Phys. B 114, 167 (2014)
E. Träbert
(See online at https://doi.org/10.1007/s00340-013-5586-z) - Astrophys. J. 788, 25 (2014)
P. Beiersdorfer, E. Träbert, J. K. Lepson, N. S. Brickhouse, L. Golub
(See online at https://doi.org/10.1088/0004-637X/788/1/25) - Astrophys. J. Suppl. Ser. 211, 14 (2014)
E. Träbert, P. Beiersdorfer, N. S. Brickhouse, L. Golub
- Astrophys. J. Suppl. Ser. 211, 14 (2014)
E. Träbert, P. Beiersdorfer, N. S. Brickhouse, L. Golub
