MD1271: Effect of low frequency noise on the evolution of the emittance and halo population

Summary For the High Luminosity upgrade the in IR1 and IR5 will be further reduced compared to the current LHC. As the decreases the -functions in the inner triplet (IT) increase resulting in a higher sensitivity of the HL-LHC to ground motion in the IT region or to increases of the low frequency noise. Noise can in general lead to emittance growth and higher halo population and diusion rate. However, it is usually assumed in the literature that only frequencies close to the betatron frequencies and sidebands have an eect on the emittance and tail population. To test this theory, an MD was carried out to observe if also low frequency noise can lead to emittance growth and stronger halo population and diusion.