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In this MD, a beam scraping was performed using the momentum primary collimator in IR3 where dispersion is high. A second scraping was performed using a TCSG in IR7 where dispersion is almost negligible. In such a way, we aim to disentangle the contribution of o?-momentum particles to halo population. These scrapings will provide useful information to better understand the usual o?-momentum losses we see at the start of the ramp.
At the start of the energy ramp at the LHC, any uncaptured beam is quickly lost on the momentum collimators. This causes significant instantaneous losses, and it is therefore important to understand these losses in detail in case they would become critical at the LHC itself or in future machines. This note aims at first analyzing data of these losses from the 2016 LHC run to quantify their features. Then, simulation methods are developed.
MD 1673 was carried out on October 5 2016, in order to investigate in more detail the available aperture in the LHC high-luminosity insertions at 6.5 TeV and ??=40 cm. Previous aperture measurements in 2016 during commissioning had shown that the available aperture is at the edge of protection, and that the aperture bottleneck at ??=40 cm in certain cases is found in the separation plane instead of in the crossing plane.
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