The ZEUS Central Tracking Detector Second Level Trigger

by A. Quadt (CERN)

Monday 31 May 1999, 00:00 → 00:15 Europe/Zurich

CERN

We present the Second Level Trigger for the Central Tracking Detector (CTD-SLT) of the ZEUS experiment. The CTD-SLT consists of a network of microprocessors running a track finding algorithm. Operational experience gained during the 1995 to 1997 HERA data taking periods how that the maximum processing rate approaches 800 Hz, with almost 100% track finding efficiency and adequate pt and vertex resolution s(pt) ~ 0.05 pt2 (pt in GeV) and s(zvtx) ~ 9 cm. The online performance of a highly parallel system with dynamic loading such as the CTD-SLT is characterised by two quantities, the average throughput (speed) and the processing time per event (latency). Detailed understanding of these quantities for the CTD-SLT from operational experience, simulations and a simple model will be discussed.

Organiser(s): Rui Ribeiro