~800 getter pumps, plus various others. The pressure in the beam pipe is 1 to 10 nPa. A weaker vacuum would mean too many protons get lost. That would be bad for the magnets (heat load) and for the luminosity (the runs are several hours long, most protons should survive that long). Some more issues with the machine delayed the recovery from the technical stop. We had 600 bunches overnight, now the cryogenics system has another issue. Once that is fixed a few hours with 1300 bunches will be needed, and a few more hours of tests, then the machine goes back to the previous record of 2556 bunches and the experiments can resume regular data-taking at the full luminosity.