Beam-induced heat loads on the beam screens of the HL-LHC arcs

The heat load on the beam screens of cold magnets and drift sections in the HL-LHC arcs is estimated considering power deposition from impedance, synchrotron radiation and electron cloud. Estimates are given both for the standard 25ns scheme and for the 8b+4e backup scheme. These two beam structures can optionally be combined within the same filling scheme to find the best compromise between performance and heat load. For this purpose, a simple analytic model is derived, which allows determining the optimal share for a given target heat load.