Speaker
Description
As part of an ongoing performance improvement at the Siam Photon Source (SPS), the 40 MeV electron injector system is undergoing an evaluation of its present beam properties. While previous measurements reported an overall transmission efficiency of approximately 26 % through the injector linac and Low-Energy Beam Transport line (LBT), recent investigations were conducted to evaluate the current machine status and investigate the origins of residual beam losses. To identify the mechanisms limiting transmission efficiency, transverse beam characteristics were evaluated using phosphor screen monitors with dipole and quadrupole scan techniques. Image processing routines with region-of-interest bounding and Kernel Density Estimation (KDE) were implemented to extract beam profiles from the screen data. The diagnostic analysis showed a relative energy spread of 3.2 %, which causes the transverse beam envelope to expand and approach the physical aperture limits within the LBT, alongside geometric transverse emittances of $\varepsilon_x = 6.2$ mm$\cdot$mrad and $\varepsilon_y = 1.9$ mm $\cdot$mrad. These measurements identify the root cause of the beam losses and provide critical data for beam dynamics simulations and machine optimizations.
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