| Issue |
EPJ Web Conf.
Volume 201, 2019
The XXII International Scientific Conference of Young Scientists and Specialists (AYSS-2018)
|
|
|---|---|---|
| Article Number | 04001 | |
| Number of page(s) | 5 | |
| Section | High Energy Physics | |
| DOI | https://doi.org/10.1051/epjconf/201920104001 | |
| Published online | 04 February 2019 | |
https://doi.org/10.1051/epjconf/201920104001
Emittance scans for CMS luminosity calibration
1
CERN, Geneva, Switzerland
2
Sofia University, Sofia, Bulgaria
* Corresponding author: olena.karacheban@cern.ch
Published online: 4 February 2019
Emittance scans are short van der Meer type scans performed at the beginning and at the end of LHC fills. The beams are scanned across each other in x and y planes. CMS has analyzed these scans to understand long-term trends in CMS luminosity detectors. The CMS Beam Radiation, Instrumentation and Luminosity (BRIL) project provides to LHC three independent online luminosity measurements from the Pixel Luminosity Telescope (PLT), the Fast Beam Condition Monitor (BCM1F) and the Forward Hadronic calorimeter (HF). The excellent performance of the BRIL detector front-ends, fast back-end electronics and CMS XDAQ based data processing and publication allow the use of emittance scans for linearity and stability studies of the luminometers. Emittance scans became a powerful tool and dramatically improved the understanding of the luminosity measurement during the year.
© The Authors, published by EDP Sciences, 2018
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.