CERN Accelerating science

ATLAS Note
Report number	arXiv:0909.5378 ; ATL-COM-DAQ-2009-041
Title	The software of the ATLAS beam pick-up based LHC monitoring system
Author(s)	Ohm, C. (Stockholm U.) ; Pauly, T. (CERN)
Collaboration	ATLAS collaboration
Publication	2009
Imprint	16 May 2009
Number of pages	10
Note	This is the draft submitted to the proceedings for CHEP09 which will be published in Journal of Physics: Conference Series. Thilo hasn't had a chance to comment on this paper yet, but it is still possible to update the document submitted to JoPCS. Sorry for being late.. Comments: 10 pages. Submitted to the proceedings of CHEP09 (Prague, Czech Republic)
In:	J. Phys.: Conf. Ser. 219 (2010) pp.022040
In:	17th International Conference on Computing in High Energy and Nuclear Physics, Prague, Czech Republic, 21 - 27 Mar 2009, pp.022040
DOI	10.1088/1742-6596/219/2/022040
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ATLAS ; Beam monitoring ; Level-1 trigger ; BPTX ; LHC ; LHC timing signals
Abstract	The ATLAS BPTX stations are comprised of electrostatic button pick-up detectors, located 175 m away along the beam pipe on both sides of ATLAS. The pick-ups are installed as a part of the LHC beam instrumentation and used by ATLAS for timing purposes. The signals from the ATLAS BPTX detectors are used both in the trigger system and for a stand-alone monitoring system for the LHC beams and timing signals. The monitoring software measures the phase between collisions and clock with high accuracy in order to guarantee a stable phase relationship for optimal signal sampling in the sub-detector front-end electronics. It also measures the properties of the individual bunches and the structure of the beams. In this paper, the BPTX monitoring software is described, its algorithms explained and a few example monitoring displays shown. In addition, results from the monitoring system during the first period of single beam running in September 2008 are presented.
Copyright/License	Preprint: (License: CC-BY-4.0)

Corresponding record in: Inspire