Construction Of Research Methods Based On EBIT Spectroscopy And Development Of Ultra-low Energy EBIT

Highly charged ion (HCI) exists everywhere in our universe and provides us with an important diagnostic tool for investigations of laboratory and astrophysical high temperature plasmas.Electron beam ion trap (EBIT) is a powerful device which produces and traps HCIs. In an EBIT the electron beam is quasi mono-energetic and the ion density is quite low, which makes EBIT an excellent HCI source for high resolution spectroscopic research and diagnostic of high temperature plasma.Shanghai-EBIT was established at Fudan University in 2005, and is one of four Super-EBITs in the world, meaning the electron beam energy can be over 50 keV. Spectroscopy measurements play a crucial role in spectroscopic research at the Shanghai-EBIT. One of the themes of this thesis is on spectroscopic methods and devices based on the Shanghai-EBIT. This theme consists of three separate aspects:?. A high resolution flat crystal spectrometer was tested both offline and online for operation at the Shanghai-EBIT. The photon energy range of this instrument is from 0.5 to 10 keV and an energy resolution under 1 eV has been achieved.?. A control system for the trap region of the Shanghai-EBIT has been setup. This system plays a key role in EBIT operation and is the foundation for MEVVA injection and for scanning the electron beam energy for di-electronic recombina-tion, DR, studies,?. A DR scan and data acquisition system has been setup. The data acqui-sition system has multi-parameter recording possibilities. This system has been successfully used in the Xenon's KLL DR study.Recently, an ultra low energy EBIT has been developed. One aim of this device is to offer the means for edge plasma studies in Tokamaks. Part of this thesis is on the development of ultra low energy EBITs. This section of the thesis contains two parts:I. The first domestic ultra low energy EBIT, SH-PermEBIT, has been devel-oped for spectroscopic studies of moderate charge state ions. This first domestic ultra low energy EBIT has reached a low energy electron beam energy of around only 250 eV. ?. A new ultra low energy EBIT, SH-HtscEBIT, has been designed based on high temperature superconducting magnets. The SH-PermEBIT used permanent magnets. Improvements including magnets, structure and material have been made in order that the low energy limit can go as low as around 50 eV.