Final Report of B548129: Spectral Analysis of Soft X-Ray Data from NSTX

Lepson, J K ; Jernigan, J G ; Beiersdorfer, P

Lawrence Livermore National Laboratory

关键词: K Shell;    Molybdenum;    70 Plasma Physics And Fusion;    74 Atomic And Molecular Physics;    Impurities;   

DOI  :  10.2172/924174
RP-ID  :  UCRL-SR-236561
RP-ID  :  W-7405-ENG-48
RP-ID  :  924174

美国|英语

来源: UNT Digital Library

【 摘 要 】

We present a summary of work performed under subcontract B548129 'Spectral Analysis of Soft X-Ray Data from NSTX'. This summary is comprised of papers and poster presentations prepared under this subcontract. The X-ray and Extreme Ultraviolet Spectrometer (XEUS) has been used to monitor the line emission from various impurity ions on NSTX, in particular the K-shell emission of helium-like and hydrogen-like B, C, N, and O. While C VI typically dominates the spectrum, unusually strong emission from N VII has been observed in multiple discharges during the past run campaign. In this case, the nitrogen concentration can exceed that of carbon by an order of magnitude. Time-dependent measurements show that the nitrogen concentration builds up over the course of the discharge and coincides with a build up of boron. In a few cases we observed several unknown lines. These are clearly lines from heavy impurities, possibly molybdenum. Some of these lines can be explained by the emission from Ti XIII.