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Abstract
With the high accelerating gradient, radiofrequency (rf) gun has a significant feature of suppressing the growth of transverse emittance caused by space charge. Field emission cathodes were first used in vac-uum electronic devices, which do not require the high electron beam intensity, but the compact geometry size of the cathode. A new X-band (11.424 GHz) rf electron gun has been proposed with the highlight of four-feed coupler, which can eliminate the quadrupole field component observed and analysed from the imagine experiment carried on, which have affected the resolu-tion of the imaging system to some content.
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Details
1 Department of Engineering Physics, Tsinghua University , Beijing 100084 , PR China; Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Tsinghua University , Beijing 100084 , PR China