Emittance measurement of space charge dominated electron beam confined by a longitudinal magnetic field

2002 ◽  
Author(s):  
Y. Hayashi ◽  
A. Okino ◽  
E. Hotta
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Space Charge ◽  
Longitudinal Magnetic Field ◽  
Emittance Measurement

scholarly journals SIMULATION OF THE COMPENSATION OF A HIGH-CURRENT ION BEAM BY AN ELECTRON BEAM IN A CUSP MAGNETIC SYSTEM

2021 ◽  
pp. 122-127
Author(s):  
I.N. Onishchenko ◽  
O.V. Fedorovskaya
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Space Charge ◽  
Longitudinal Magnetic Field ◽  
Ion Beam ◽  
Zero Magnetic Field ◽  
High Current ◽  
Field Lines ◽  
Dynamics Of Particles ◽  
The Magnetic Field

The results of 2.5D-simulation of the dynamics of particles of a high-current ion beam moving in a magnetic field of acute-angled geometry (cusp), compensated in charge and current by an electron beam injected along the radius onto the axis from the periphery, uniformly in azimuth, are presented. The influence of own space charge fields and polarization fields on the dynamics of ions is clarified. It is shown that at high densities of the electron and ion beams, the electron beam injected into the cusp together with the ion beam, moving along the magnetic field lines, drags the ion beam away from the axis to the periphery into the region of zero magnetic field. At the exit from the cusp, the electron beam injected along the radius onto the axis drifts along the axis in a uniform magnetic field, while the ion beam performs oscillatory motion by radius in the crossed the electric field of the electron beam space charge and the longitudinal magnetic field.

An emittance measurement device for a space-charge dominated electron beam

2012 ◽  
Vol 36 (9) ◽  
pp. 867-870
Author(s):  
Wen-Jing Wang ◽  
Sen-Lin Huang ◽  
Sheng-Wen Quan ◽  
Lin Lin ◽  
Ke-Xin Liu
Keyword(s):  
Electron Beam ◽  
Space Charge ◽  
Measurement Device ◽  
Emittance Measurement

scholarly journals Low-Energy State Electron Beam in a Uniform Channel

Plasma ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 222-228 ◽  
Author(s):  
Mikhail Fuks ◽  
Dmitrii Andreev ◽  
Artem Kuskov ◽  
Edl Schamiloglu
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Space Charge ◽  
Virtual Cathode ◽  
Energy State ◽  
Beam Current ◽  
Low Energy ◽  
Magnetic Mirror ◽  
Limiting Current ◽  
Uniform Channel

In our earlier work, we showed that a low-energy state of an electron beam exists in a nonuniform channel between two virtual cathodes in a magnetron with diffraction output, which consists of three uniform sections with increasing radius. A uniform axial magnetic field fills the interaction space. This led to magnetron operation with >90% efficiency when combined with a magnetic mirror field at the output end. In this present paper, we show that a low-energy state of an electron beam can be realized in a uniform channel in which an increasing magnetic field is used in order to create a magnetic mirror at the output end. We consider two cases, one where the injected beam current slightly exceeds the space-charge-limiting current and the other where the injected beam current greatly exceeds the space-charge-limiting current. On the time scale of relevance to planned experiments (∼30 ns), when the injected current slightly exceeds the space-charge-limiting current a stationary virtual cathode forms and when the injected current greatly exceeds the space-charge-limiting current the virtual cathode oscillates back and forth.

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