Speaker
Description
In the context of the High-Luminosity Large Hadron Collider (HL-LHC), high-intensity beams of 2.3 · 1011 protons per bunch are planned to be injected at the LHC after Long Shutdown 3 (LS3) at CERN. To cope with these beam intensities, several strategies have been put in place to reduce the power requirements of the 2 x 8 accelerating cavities installed in the machine. Among them, one of the most challenging is the injection process. In this work, we present a scheme where we modulate the phase bunch-by-bunch in the LHC to minimize the peak RF power at injection. The ejection bunches at the Super Proton Synchrotron (SPS) are likewise phase-modulated for optimal capture. Implementing this approach required complex modifications to both the SPS and LHC RF systems, since the optimal modulated phases depend on several parameters such as beam intensity, number of circulating bunches, cavity voltages, etc. In this contribution, the necessary changes implemented in the SPS and LHC LLRF systems will be presented.
| Abstract Classification | Control Architecture and Strategies |
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