guest ::
| Home > Publications database > Luminosity measurement at CMS. Analysis of the behavior of the polycrystalline diamond sensors of the BCM1F detector |
| Home > Publications database > Luminosity measurement at CMS. Analysis of the behavior of the polycrystalline diamond sensors of the BCM1F detector |
| Conference Presentation | PUBDB-2019-02022 |
2019
This record in other databases:
Please use a persistent id in citations: doi:10.3204/PUBDB-2019-02022
Abstract: An important parameter of a collider is its luminosity. It indicates the ratio between the cross-section of action of a process and its event rate. For determination of the cross sections of physical processes, it is therefore essential to determine the luminosity as accurately as possible. This is done by measuring the event rate. From the visible cross section of a so-called luminometer the total luminosity can be extrapolated. The visible cross section is determined in calibration measurements (Van der Meer scans). If the visible cross section is known for a luminometer, the instantaneous luminosity can be measured in real-time. Several luminometers are used in the CMS experiment. One of these detectors is the Fast Beam Condtition Monitor (BCM1F). The BCM1F detector consists of poly-crystalline diamond sensors that are mounted on 4 C-shapes. These C-shapes enclose the beam pipe on both sides at a distance of 1.8 m from the interaction point. However, the efficiency of these sensors shows a dependency on the absolute event rate. For its calibration the 'per bunch' luminosity changing during a 'fill' of the collider has to be considered. Also the total Luminosity, which for example depends on the number of bunches in a fill, has an influence on the efficiency of the sensors. In the talk the luminosity measurement at the CMS experiment as well as the calibration of BCM1F are presented.
|
The record appears in these collections: |
PDF
PDF (PDFA)