H. Itterbeck et J. Tutas, APPLICATION OF A FAST TRIGGER SYSTEM TO THE BACKWARD DRIFTCHAMBER OF H1, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 394(1-2), 1997, pp. 57-64
During the winter shutdown from 1994 to 1995, the backward region of t
he H1 detector was substantially upgraded. Amongst other improvements,
a new calorimeter (SPACAL) and a backward drift chamber (BDC) were in
stalled to improve particle detection in the backward region. A first-
level trigger system was provided for the BDC which helps to suppress
background tracks. This trigger system, based on fast RAM Lookup-table
s, is described together with a summary of the first results from the
taken data.