A fast high-resolution track trigger for the H1 experiment

Citation
J. Naumann et al., A fast high-resolution track trigger for the H1 experiment, IEEE NUCL S, 48(4), 2001, pp. 1276-1281
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Nuclear Emgineering
Journal title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
ISSN journal
0018-9499 → ACNP
Volume
48
Issue
4
Year of publication
2001
Part
1
Pages
1276 - 1281
Database
ISI
SICI code
0018-9499(200108)48:4<1276:AFHTTF>2.0.ZU;2-8
Abstract
After 2001, the upgraded ep collider HERA will provide an about five times higher luminosity for the two experiments Hl and ZEUS. To cope with the exp ected higher event rates, the Hl collaboration is building a track-based tr igger system, the Fast Track Trigger (FTT). It will be integrated in the fi rst three levels (L1-L3) of the HI trigger scheme to provide higher selecti vity for events with charged particles. The FTT will allow reconstruction o f three-dimensional tracks in the central drift chamber down to 100 MeV/c w ithin the L2 latency of similar to 23 mus. To reach the necessary momentum resolution of,similar to5% (at 1 GeV/c), sophisticated reconstruction algor ithms have to be implemented using high-density field-programmable gate arr ays and their embedded content addressable memories. The final track parame ter optimization will be done using noniterative fits implemented in digita l signal processors. While at the first trigger level rough track informati on will be provided, at L2 tracks with high resolution are available to for m trigger decisions on topological and other track-based criteria like mult iplicities and momenta. At the third trigger level, a farm of commercial pr ocessor boards will be used to compute physics quantities such as invariant masses.