|M.Sc Student||Gissis Itay|
|Subject||Spectroscopy of N Capillary Discharge Plasma for|
Recombination Pumped X-ray Laser
|Department||Department of Physics||Supervisors||Professor Ehud Behar|
|Dr. Amnon Fisher|
|Full Thesis text|
We present the first high resolution, time-resolved X-ray spectra and density measurement of a nitrogen capillary discharge z-pinch plasma. We use an apparatus consisting of a free standing Transmission grating spectrometer and a gated framing MCP camera developed and built specifically for this experiment. Capillary discharge plasmas can serve for the purpose of a recombination-pumped X-ray laser. This is the first measurement of both K-shell and L-shell line emission from an N capillary discharge. We analyze it using a newly developed 4-ion collisional-radiative atomic model. Comparison of the spectra with transient ionization model shows that the plasma is heated to 64eV-74eV during the pinch, followed by fast cooling of less than 4ns throughout the capillary. The fast cooling demonstrates the feasibility of a recombination-scheme laser in the nitrogen Hα line at 13.4nm, if higher plasma temperature can be achieved.