研究目的
To determine the effective electron density, ne,eff, experienced by the ions in an electron beam ion trap (EBIT) by measuring the electron beam size, the nominal electron density ne, and the ion distribution around the beam.
研究成果
The study successfully measured the electron beam and ion cloud profiles in EBIT-I and derived ne,eff. The results provide an important exploration of potential systematic issues related to electron beam and ion cloud measurements in an EBIT. The spatially averaged effective electron densities of ne,eff ～ 5 × 109 to 5 × 1011 cm?3, which are typical of the solar corona, can be generated in EBIT-I.
研究不足
The asymmetry and broad base of the ion cloud image may be due to aberrations in the lens as well as a slight misalignment of the lens plane relative to the object plane. Additional contributions to the asymmetry and broad base of the image may be due to reflection from the drift tube and emission from metastable levels in Fe iii, vi, and vii.
1：Experimental Design and Method Selection:
The study uses imaging techniques in the extreme ultraviolet (EUV) and optical to measure the electron beam and ion cloud sizes. The electron beam width is measured using 3d → 3p emission from Fe xii and xiii between 185 and 205 ?. The ion cloud size is determined using optical emission from metastable levels of ions with radiative lifetimes longer than the ion orbital periods.
2：Sample Selection and Data Sources:
Fe was introduced into EBIT-I as iron pentacarbonyl [Fe(CO)5] using a collimated continuous ballistic gas injection system.
3：List of Experimental Equipment and Materials:
The high resolution grazing-incidence grating spectrometer (HiGGS) with a grating of 2400 lines/mm and a radius of curvature of R = 44.3 m, a liquid-nitrogen-cooled charge-coupled device (CCD), a bandpass filter centered at 530 nm with a bandwidth of 10 nm, and a plano-convex lens with a focal length of 50.1 ± 0.5 cm.
4：3 m, a liquid-nitrogen-cooled charge-coupled device (CCD), a bandpass filter centered at 530 nm with a bandwidth of 10 nm, and a plano-convex lens with a focal length of 1 ± 5 cm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The electron beam current I e, the electron beam size, and the ion cloud size were measured. The trapping cycle was 1 s long, and at the end of each cycle, the trap was dumped for 5 ms.
5：Data Analysis Methods:
The observed line width is primarily due to the electron beam diameter. The ion cloud image was approximated using two Gaussians with different widths.
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