Speaker
Description
Emittance is a key parameter that characterizes beam quality and its behavior under given optics. Conventional emittance measurement methods reconstruct the beam phase-space based on Twiss parameters calculated from beam profiles, and are therefore based on Gaussian beam optics. To overcome this limitation, tomography techniques have been introduced to reconstruct the phase-space distribution using projection data measured at various phase-space angles. In this study, we reconstruct the phase-space distribution using the Maximum Entropy Theory (MENT) with data from the slit-based Virtual Pepper-Pot (VPP) diagnostics at the Beam Test Stand (BTS) of the Korea Multipurpose Accelerator Complex (KOMAC). To avoid nonlinear effects such as space charge, which can occur in conventional multi-optics tomography when the measurement point and the reconstruction point are different, a single-optics configuration is established using a fixed quadrupole setting. In this configuration, angular projection data are obtained by introducing Additional Diagonal Scan (ADS) and Multi-Screen Scan (MSS). Using X-suite simulations, the two methods are quantitatively compared in terms of total variation distance (TVD) and emittance error.
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