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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation IX

HK 44.2: Vortrag

Mittwoch, 20. März 2019, 17:00–17:15, HS 11

Online tracking with the ALICE Transition Radiation Detector — •Marten Ole Schmidt for the ALICE collaboration — Physikalisches Institut, University of Heidelberg

After the ongoing maintenance work at the LHC, the ALICE detectors will collect data in a continuous readout mode instead of the triggered mode used before. Major upgrades are conducted on most of the subdetectors to allow for this new readout scheme.

The Transition Radiation Detector (TRD) will keep its current design and only update its readout chain. Up to now, both digits from hits in the TRD as well as on-the-fly reconstructed TRD tracklets were stored on tape. The digits were used for the offline performed tracking, while the tracklets were used to generate online trigger decisions. Due to bandwidth constraints, the TRD read out after the upgrade is restricted to tracklets, such that the tracking implementation must change.

Tracks reconstructed in the inner detectors of ALICE will be prolonged to the TRD and used as seeds. The new TRD tracking was developed and tested in the ALICE High Level Trigger during data taking in 2018 both in p--p and Pb--Pb collisions. We present the performance of the new tracking algorithm in both collision systems and discuss the status of the implementation on GPUs which is foreseen for the new Online-Offline computing framework of ALICE for the next data taking periods.