Speaker
Description
The SuperKEKB collider aims to surpass the previous luminosity record of its predecessor by 40 times. The understanding of the electron and positron beam phase-space (P-S) is of upmost importance to understand the efficiency of the machine and also to be able to plan possible improvements and anticipate the machine limits. Multiple diagnostics are capable of giving global information about the beam. However, an accurate real beam P-S distribution is of great relevance not only experimentally but also for simulations. By knowing how the beam P-S looks and evolves, one can make sure that the simulations are accurate, predict ring injection, and can be used as input for simulations among other things. The measurement of a full 2D P-S is not easy task, and it is usually prepared from the beamline design stages. One such technique is the computed tomography, first applied to beams in 1995*, and based on the beam P-S reconstruction via the analysis of 1D projections at different phase-space rotation angles. In this work we present the use of this technique at SuperKEKB to obtain both transverse 2D beam P-S and the evolution of the phase-space along 10 m of the beamline. The main novelties of this work are the use of a normal non prepared beamline (as no changes were possible) with a complex setup (1 OTR screen and different groups of >3 quadrupoles along ~45m) and its use to see the evolution at different points of the beamline. Comparisons with simulations are also presented.
Footnotes
*McKee, C. B., P. G. O'Shea, and J. M. J. Madey. "Phase space tomography of relativistic electron beams." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 358.1-3 (1995): 264-267.
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