Angular distribution of beam electrons in a source with arc plasma emitter

5th International Congress on Energy Fluxes and Radiation Effects 2016

Kurkuchekov, V.^1 ; Astrelin, V.^1 ; Kandaurov, I.^1 ; Trunev, Yu.^1

BINP of SB RAS, Novosibirsk, Russia^1

关键词: Angular characteristics;    Arc discharge plasmas;    Diagnostic techniques;    Electron energies;    Emission current;    Gaussian functions;    Pulse durations;    Spatial resolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012031/pdf
DOI  :  10.1088/1742-6596/830/1/012031

来源: IOP

【 摘 要 】

Results on studying the angular characteristics of an electron beam, generated in a multi-aperture diode with an arc-discharge plasma emitter are reported. The main beam parameters were as follows: the electron energy up to 120 keV, the emission current up to 100 A, the pulse duration 0.1 - 0.3 ms, and the initial diameter ca. 8 cm. The beam was formed and transported to a metal target in an adiabatically converging magnetic field. The diagnostic technique based on an X-ray imaging of the profiles of individual beamlets passed through the pepperpot-like mask was developed and used to investigate an angular distribution of the beam electrons. The spatial resolution of the diagnostic was evaluated in a special test experiment and found to be not worse than 4 lp/cm at a 10 % contrast level. It was demonstrated that an angular distribution of the beam electrons fits well by the Gaussian function with the RMS width ∼ 0.067 rad. The data on the angular distribution measured with pepperpot diagnostic are in a good agreement with those obtained in the experiments on the beam passage through a magnetic mirror.