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000205298 005__ 20211110125836.0
000205298 0247_ $$2arXiv$$aarXiv:1406.4955
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000205298 0247_ $$2inspire$$ainspire:1301597
000205298 037__ $$aPUBDB-2014-04700
000205298 0881_ $$aarXiv:1406.4955
000205298 088__ $$2arXiv$$aarXiv:1406.4955
000205298 1001_ $$0P:(DE-H253)PIP1020363$$aBilka, T.$$b0$$eCorresponding Author
000205298 1112_ $$a19th Real Time Conference$$cNara$$d2014-05-26 - 2014-05-30$$g(RT2014)$$wJapan
000205298 245__ $$aDemonstrator of the Belle II Online Tracking and Pixel Data Reduction on the High Level Trigger System
000205298 260__ $$c2014
000205298 3367_ $$033$$2EndNote$$aConference Paper
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000205298 500__ $$aOA
000205298 520__ $$aWe present a computer-farm based data reduction system for the future Belle II experiment. Belle II will collect data from SuperKEKB, an asymmetric e^+e^- collider whose target luminosity (8x10^35 Hz/cm^2) is a factor 40 larger than the present world record held by KEKB. The higher trigger rate (10 kHz) and worse background conditions (3% average occupancy on the pixel sensors) are a major challenge for both the detectors and the DAQ, in particular for the inner part of the Belle II tracking system that consists of two cylindrical layers of DEPFET pixels sensors (PXD) placed just outside the beam pipe, very close to the Interaction Point (IP). The long integration times of the PXD together with the high background rate expected will lead to a large amount of data (> 20 GB/s) that must be reduced at least tenfold. A large amount of background hits can be rejected by defining a set of Region Of Interest (ROI) on the PXD sensors 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 silicon tracker and reconstructed online in real time. A demonstrator of this architecture was under beam test earlier this year in DESY. The demonstrator was operated in an electron beam (2-6 GeV/c) with a typical trigger rate of a few kHz in a magnetic field of strength up to 1 T. The demonstrator consists of one PXD sensor and 4 SVD sensors arranged in a 5 layer configuration mimicking the Belle II vertex detector. The detector readout was a scaled down version of the full Belle II DAQ + High Level Trigger 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.
000205298 536__ $$0G:(DE-H253)POF2-BELLE-I-II-Exp.-20130405$$aExperiments at KEK (BELLE I/II) (POF2-515)$$cPOF2-515$$fPOF II$$x0
000205298 588__ $$aDataset connected to INSPIRE
000205298 650_7 $$2INSPIRE$$asemiconductor detector: pixel
000205298 650_7 $$2INSPIRE$$acomputer: network
000205298 650_7 $$2INSPIRE$$aBELLE
000205298 650_7 $$2INSPIRE$$atrigger
000205298 650_7 $$2INSPIRE$$abackground
000205298 650_7 $$2INSPIRE$$adata acquisition
000205298 650_7 $$2INSPIRE$$avertex detector
000205298 650_7 $$2INSPIRE$$aelectron: irradiation
000205298 693__ $$0EXP:(DE-H253)BELLE-20150101$$1EXP:(DE-H253)KEK-20150101$$5EXP:(DE-H253)BELLE-20150101$$aKEK$$eKEK: BELLE I/II$$x0
000205298 7001_ $$0P:(DE-H253)PIP1021064$$aCasarosa, G.$$b1
000205298 7001_ $$aFrühwirth, R.$$b2
000205298 7001_ $$0P:(DE-H253)PIP1002217$$aKleinwort, C.$$b3
000205298 7001_ $$0P:(DE-H253)PIP1021513$$aKodys, P.$$b4
000205298 7001_ $$0P:(DE-H253)PIP1021477$$aKvasnicka, P.$$b5
000205298 7001_ $$0P:(DE-H253)PIP1021560$$aLettenbichler, J.$$b6
000205298 7001_ $$0P:(DE-H253)PIP1021063$$aPaoloni, E.$$b7
000205298 7001_ $$0P:(DE-H253)PIP1021632$$aRauch, J.$$b8
000205298 7001_ $$0P:(DE-H253)PIP1021494$$aSchlüter, T.$$b9
000205298 7001_ $$0P:(DE-H253)PIP1005040$$aYashchenko, S.$$b10
000205298 8564_ $$uhttp://rt2014.rcnp.osaka-u.ac.jp/
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000205298 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1005040$$aDeutsches Elektronen-Synchrotron$$b10$$kDESY
000205298 9132_ $$0G:(DE-HGF)POF3-611$$1G:(DE-HGF)POF3-610$$2G:(DE-HGF)POF3-600$$aDE-HGF$$bForschungsbereich Materie$$lMaterie und Universum$$vFundamental Particles and Forces $$x0
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