Accelerator Report: Final countdown – CERN’s injector complex enters its last stretch before LS3

As the LHC enters Long Shutdown 3 (LS3), CERN's injector complex completes its final days of beam operations. The LHC has already halted, leaving the rest of the accelerator complex to operate intensively until 31 August. During these final days, the accelerators continue to deliver proton and ion beams for physics research and data collection, while also preparing for the future.

One of the key activities includes delivering lead-ion beams to the North Area to support an active physics programme. Additionally, special beam tests were conducted on 17 August, with lead ions and low-energy proton beams sent to the HiRadMat facility to evaluate expanding the range of studies in extreme beam conditions.

For the operational teams, these final days are crucial for obtaining measurements and results vital for doctoral research and technical studies. Beam physicists, operators, and equipment specialists are maximizing the remaining beam time to ensure the complex is fully prepared for the start of Run 4 after the shutdown.

Another important milestone was the beginning of the physics run of the HEARTS project on 19 August. This EU-funded project delivers lead-ion beams to the T8 line in the East Area, where users test microelectronic components under controlled irradiation conditions. These tests are essential for satellite and spaceflight applications, as well as for CERN's large experimental detectors.

Looking ahead to Run 4, CERN's accelerator complex will gradually come back to life, starting with Linac4, the PS Booster, and ISOLDE in early 2028. The work done during these busy weeks, along with extensive activities planned during LS3, will lay the foundation for a successful restart and a new era of accelerator operation. However, for now, the focus remains on making every remaining hour of beam time count.