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Description
One of critical beam parameters for a linear accelerator is a beam energy. This research studies on measurements of energy and energy spread of electron beams produced from a thermionic cathode RF electron gun at the Plasma and Beam Physics Research Facility, Chiang Mai University. An alpha magnet is used for energy filtering by using energy slits located inside the alpha magnet vacuum chamber. These energy slits equipped with stepping motor and programmable encoder are used together with a current transformer downstream the alpha magnet to measure the electron beam energy and energy spectrum. Moreover, the electron beam energy can also be measured by using a dipole magnet for bending electrons to the screen and a CCD camera is used to capture a transverse image of electron beam. An image capture program is installed in a PC computer for recording and analyzing the transverse distribution of electron beam. Finally, beam dynamic simulation using programs PARMELA and ELEGANT are performed to compare the result with the measurement data.
