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The non-immersed focusing of radial electron beam is investigated by theoretical analysis and PIC simulation. Under the condition of thermionic emission and diode voltage is 2kV, the operation mode of coaxial foilless diode with focusing electrode changes from emission capacity limited into space charge limited. The I-V relationship and electrostatic beam trajectory of the diode are obtained by simulation...
In order to optimize the open loop control strategy of stepper motor, the velocity profiles of stepper motor were studied. There are three widespread used velocity profiles: trapezoidal, parabolic, and S-curve profiles. In this paper, trapezoidal velocity profile was chosen for further study. In order to accurately generate an arbitrary trapezoidal velocity profile, a new velocity profile generation...
The purpose of this article is to introduce some approaches to develop students' autonomous ability. Teachers should design and organize various activities to prepare students for more independence and responsibility. The author firstly presents some problems in traditional teaching students with non-English majors. Then, the paper presents the practical ways of teaching based on the learner-centered...
This paper aimed at the features of the array antenna that with large number units, short work cycle, complex electromagnetic environment and high stability requirement, designed the master control system which based on the VxWorks real-time operating system. The master control system as a whole array antenna control center needed to connect multiple subsystems. After a full investigation, the paper...
A special Controller Area Network (CAN) bus application layer protocol is designed for the high reliable and high real-time control network of the beam control system. In this paper, messages on the network are classified and the identifier coding, data coding, network management mechanism and physical interface are defined. Then network load analysis for the real-time control network is introduced...
Magnetic field distributions of a planar pulse microwiggler are studied analytically and numerically. Exact solutions of two-dimensional magnetic fields are derived, and the formulae show that along the electron axis the fields have a variation close enough to a sine wave. We also investigate wiggler field errors due to machining tolerance and effects of the field errors on trajectories of electron...
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