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Upgrade of the level-0 trigger system for BNL-E949
Yoshioka, T. Nomachi, M. Artamanov, A. Bhuyan, B. Frank, J.S. Fujiwara, T. Higa, K. Kettell, S.H. Komatsubara, T.K. Konaka, A. Kozjevnikov, A. Kushnirenko, A. Muramatsu, N. Nakano, T. Nomura, T. Petrenko, S. Poutissou, R. Redlinger, G. Sekiguchi, T. Shinkawa, T. Sugimoto, S. Tsunemi, T.
High Energy Accelerator Res. Organ., Ibaraki, Japan;

This paper appears in: Nuclear Science, IEEE Transactions on
Publication Date: June 2004
Volume: 51, Issue: 3, Part 1
On page(s): 334- 339
ISSN: 0018-9499
INSPEC Accession Number: 8113265
Digital Object Identifier: 10.1109/TNS.2004.828867
Current Version Published: 2004-07-12

Abstract
A new programmable trigger board and digital mean-timer modules using complex programmable logic device have been introduced to the trigger system of the BNL-E949 experiment. The online dead time was reduced from 4.0% to 1.7% by introducing an on-chip prescaler to the programmable trigger board. The acceptance loss of the online photon veto was reduced from 4.9% to 1.8% by introducing the mean-timer modules.

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