It explains how electrons are accelerated by an electron gun and then deflected by a magnetic field created by Helmholtz coils. The experiment measures the mass of an electron by analyzing the ...

College of Material Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China ...

The experimental result of the magnetic field control system shows that the uniform-field coil system can produce $1~\mu $ T with 1.7-nT mean error, which is 3.6 times less than the square Helmholtz ...