1-6 September 2019
Lanzhou
Asia/Shanghai timezone
The deadline for the ICIS 2019 manuscript submission is extended to September 30. All oral presentations have been uploaded on the page of 'timetable'.

Effects of magnetic configuration on hot electrons in SECRAL-II plasma

2 Sep 2019, 11:40
20m
Lanzhou

Lanzhou

No. 1 Beibinhe East Road, Chengguan District, Lanzhou
Contributed oral

Speaker

Jibo Li

Description

To investigate the hot electrons population in highly charged electron cyclotron resonance ion source (ECRIS), the axial emitted bremsstrahlung spectra, along with microwave signal emitted from the ECRIS plasma are measured on SECRAL-II (Superconducting ECR ion source with Advanced design in Lanzhou No. II) ion source. The evolution of the hot electrons spectral temperature, Ts, is studied through the variation of magnetic configuration. The experimental results have shown that when the ratio of the minimum field to the resonance field (i.e. Bmin /Becr) is less than 0.75~0.80, there is a linear dependence of the spectral temperature on the ratio of Bmin /Becr, above this threshold Ts saturates and electron cyclotron instability appears simultaneously. This phenomenon may be due to the fact that the spectral temperature Ts provides an indication of the temperature of the hot electrons, significant losses of the hot and warm electrons caused by electron cyclotron instability will lead to a saturation of Ts. In addition, this investigation has also shown that Ts decreases with the increase of the gradient at the resonance zone at low mirror ratio and is insensitive to the gradient at high mirror ratio when Bmin is constant.

Category of your contribution Fundamental processes in ion source, plasma

Primary author

Jibo Li

Co-authors

Lixuan Li Dr Junwei Guo (Institute of Modern Physics) Mr Libin Li (Institute of Modern Physics) Wang Lu (Institute of Modern Physics) Ms Xuezhen Zhang (Institute of Modern Physics) Liangting Sun (Institute of Modern Physics, CAS) Dr Denis Hitz Prof. Hongwei Zhao (Institute of Modern Physics)

Presentation Materials

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