TY  - JOUR
AU  - Bilka, T.
AU  - Casarosa, G.
AU  - Fruhwirth, R.
AU  - Kleinwort, C.
AU  - Kodys, P.
AU  - Kvasnicka, P.
AU  - Lettenbichler, J.
AU  - Paoloni, E.
AU  - Rauch, J.
AU  - Schlueter, Tobias Alexander
AU  - Yashchenko, S.
TI  - Demonstrator of the Belle II Online Tracking and Pixel Data Reduction on the High Level Trigger System
JO  - IEEE transactions on nuclear science
VL  - 62
IS  - 3
SN  - 1558-1578
CY  - New York, NY
PB  - IEEE
M1  - PUBDB-2016-00402
M1  - arXiv:1406.4955
SP  - 1155 - 1161
PY  - 2015
N1  - (c) IEEE
AB  - The future Belle II experiment will employ a computer-farm based data reduction system for the readout of its innermost detector, a DEPFET-technology based silicon detector with pixel readout. A large fraction of the background hits can be rejected by defining a set of regions of interest (ROIs) on the pixel detector sensors (PXD) and then recording just the data from the pixels inside the ROI. The ROIs are defined on an event by event basis by extrapolating back onto the PXD the charged tracks detected in the outer trackers (a four-layer double-sided silicon strip detector surrounded by a wire chamber). The tracks are reconstructed in real time on the High Level Trigger (HLT). The pixel detector is then read out based on the ROI information. A demonstrator of this architecture was under beam test earlier this year in DESY (Hamburg, Germany). The demonstrator was operated in an electron beam whose momentum was in the 2-6 GeV/c range with a typical trigger rate of a few kilohertz in a magnetic field of strength up to 1 T. The demonstrator consists of one pixel sensor and four silicon strip sensors arranged in a five-layer configuration mimicking the Belle II vertex detector. The detector readout was a scaled down version of the full Belle II DAQ + HLT chain. The demonstrator was used to detect the particles, reconstruct in real time the trajectories, identify the ROIs on the PXD plane and record the PXD data within. We describe the requirements and the architecture of the final system together with the results obtained with the demonstrator.
T2  - 19th Real Time Conference
CY  - 26 May 2014 - 30 May 2014, Nara (Japan)
Y2  - 26 May 2014 - 30 May 2014
M2  - Nara, Japan
LB  - PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000356458000043
DO  - DOI:10.1109/TNS.2015.2419879
UR  - https://bib-pubdb1.desy.de/record/293246
ER  -