BCM1F and Luminosity calibration

The Fast Beam Condition Monitor (BCM1F) provides a real time bunch-by-bunch luminosity measurement. The stability of the calibration and the linearity of the system is monitored with regular emittance scans. This note shows the stability and linearity results for 2017. The absolute calibration is obtained in a special Van der Meer (VdM) fill. To correct for non-gaussian beams, special beam imaging scans are performed. The orbit drifts during the VdM scan are studied and corrected for. The results for the 2017 beam imaging scan and the orbit drift are shown.