Triggering with the ALICE TRD

• Verfasst von: Klein, Jochen [VerfasserIn]
• Titel: Triggering with the ALICE TRD
• Verf.angabe: Jochen Klein, for the ALICE collaboration
• Jahr: 2013
• Umfang: 6 S.
• Fussnoten: Available online 22 May 2012 ; Gesehen am 09.06.2022
• Titel Quelle: Enthalten in: Nuclear instruments & methods in physics research / A
• Ort Quelle: Amsterdam : North-Holland Publ. Co., 1984
• Jahr Quelle: 2013
• Band/Heft Quelle: 706(2013), Seite 23-28
• ISSN Quelle: 1872-9576
• DOI: doi:10.1016/j.nima.2012.05.011
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: ALICE
• Sach-SW: TRD
• Sach-SW: Trigger
• K10plus-PPN: 1751699846

Abstract

We discuss how a level-1 trigger, about 8μs after a hadron-hadron collision, can be derived from the Transition Radiation Detector (TRD) in A Large Ion Collider Experiment (ALICE) at the LHC. Chamber-wise track segments from fast on-detector reconstruction are read out with position, angle and electron likelihood. In the Global Tracking Unit, up to 6tracklets from a particle traversing the detector layers are matched and used for the reconstruction of transverse momentum and electron identification. Such tracks form the basis for versatile and flexible trigger conditions, e.g. single high-p⊥ hadron, single high-p⊥ electron, di-electron (J/Ψ, ϒ) and at least n close high-p⊥ tracks(jet). The need for low-latency on-line reconstruction poses challenges on the detector operation. The calibration for gain (pad-by-pad) and drift velocity must be applied already in the front-end electronics. Due to changes in pressure and gas composition an on-line monitoring and feedback loop for these parameters is required. First experiences on the performance were gathered from triggering in cosmic and ppruns.