The data acquisition and calibration system for the ATLAS Semiconductor Tracker

Abdesselam, A.
Barber, T.
Barr, A. J.
Bell, P.
Bernabeu, J.
Butterworth, J. M.
Carter, J. R.
Carter, A. A.
Charles, E.
Clark, A.
Colijn, A. -P.
Costa, M. J.
Dalmau, J. M.
Demirköz, Melahat Bilge
Dervan, P. J.
Donega, M.
D'Onifrio, M.
Escobar, C.
Fasching, D.
Ferguson, D. P. S.
Ferrari, P.
Ferrere, D.
Fuster, J.
Gallop, B.
Garcia, C.
Gonzalez, S.
Gonzalez-Sevilla, S.
Goodrick, M. J.
Gorisek, A.
Greenall, A.
Grillo, A. A.
Hessey, N. P.
Hill, J. C.
Jackson, J. N.
Jared, R. C.
Johannson, P. D. C.
de Jong, P.
Joseph, J.
Lacasta, C.
Lane, J. B.
Lester, C. G.
Limper, M.
Lindsay, S. W.
Mckay, R. L.
Magrath, C. A.
Mangin-Brinet, M.
Garcia, S. Marti
Mellado, B.
Meyer, W. T.
Mikulec, B.
Minano, M.
Mitsou, V. A.
Moorhead, G.
Morrissey, M.
Paganis, E.
Palmer, M. J.
Parker, M. A.
Pernegger, H.
Phillips, A.
Phillips, P. W.
Postranecky, M.
Robichaud-Veronneau, A.
Robinson, D.
Roe, S.
Sandaker, H.
Sciacca, F.
Sfyrla, A.
Stanecka, E.
Stapnes, S.
Stradling, A.
Tyndel, M.
Tricoli, A.
Vickey, T.
Vossebeld, J. H.
Warren, M. R. M.
Weidberg, A. R.
Wells, P. S.
Wu, S. L.
The SemiConductor Tracker (SCT) data acquisition (DAQ) system will calibrate, configure, and control the approximately six million front-end channels of the ATLAS silicon strip detector. It will provide a synchronized bunch-crossing clock to the front-end modules, communicate first-level triggers to the front-end chips, and transfer information about hit strips to the ATLAS high-level trigger system. The system has been used extensively for calibration and quality assurance during SCT barrel and endcap assembly and for performance confirmation tests after transport of the barrels and endcaps to CERN. Operating in data-taking mode, the DAQ has recorded nearly twenty million synchronously-triggered events during commissioning tests including almost a million cosmic ray triggered events. In this paper we describe the components of the data acquisition system, discuss its operation in calibration and data-taking modes and present some detector performance results from these tests.


The optical links of the ATLAS SemiConductor tracker
Wilson, J. A.; et. al. (IOP Publishing, 2007-09-01)
Optical links are used for the readout of the 4088 silicon microstrip modules that make up the SemiConductor Tracker of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The optical link requirements are reviewed, with particular emphasis on the very demanding environment at the LHC. The on-detector components have to operate in high radiation levels for 10 years, with no maintenance, and there are very strict requirements on power consumption, material and space. A novel concept for the packagi...
Aligning the CMS muon chambers with the muon alignment system during an extended cosmic ray run
Chatrchyan, S.; et. al. (IOP Publishing, 2010-03-01)
The alignment system for the muon spectrometer of the CMS detector comprises three independent subsystems of optical and analog position sensors. It aligns muon chambers with respect to each other and to the central silicon tracker. System commissioning at full magnetic field began in 2008 during an extended cosmic ray run. The system succeeded in tracking muon detector movements of up to 18 mm and rotations of several milliradians under magnetic forces. Depending on coordinate and subsystem, the system ach...
Alignment of the CMS tracker with LHC and cosmic ray data
Chatrchyan, S.; et. al. (IOP Publishing, 2014-06-01)
The central component of the CMS detector is the largest silicon tracker ever built. The precise alignment of this complex device is a formidable challenge, and only achievable with a significant extension of the technologies routinely used for tracking detectors in the past. This article describes the full-scale alignment procedure as it is used during LHC operations. Among the specific features of the method are the simultaneous determination of up to 200 000 alignment parameters with tracks, the measurem...
The experimental facility for the Search for Hidden Particles at the CERN SPS
Ahdida, C.; et. al. (IOP Publishing, 2019-03-01)
The Search for Hidden Particles (SHiP) Collaboration has shown that the CERN SPS accelerator with its 400 GeV/c proton beam offers a unique opportunity to explore the Hidden Sector [1-3]. The proposed experiment is an intensity frontier experiment which is capable of searching for hidden particles through both visible decays and through scattering signatures from recoil of electrons or nuclei. The high-intensity experimental facility developed by the SHiP Collaboration is based on a number of key features a...
Alignment of the CMS silicon tracker during commissioning with cosmic rays
Chatrchyan, S.; et. al. (IOP Publishing, 2010-03-01)
The CMS silicon tracker, consisting of 1440 silicon pixel and 15 148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to an average precision of 3-4 microns RMS in the barrel and 3-14 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several studies, including laser beam ...
Citation Formats
A. Abdesselam et al., “The data acquisition and calibration system for the ATLAS Semiconductor Tracker,” JOURNAL OF INSTRUMENTATION, pp. 0–0, 2008, Accessed: 00, 2020. [Online]. Available: