The NA27 trigger
Abstract
A minimum bias trigger and a fiducial volume trigger were developed for an experiment in which a small rapid cycling hydrogen bubble chamber was exposed to 360 GeV/c pi(-) and 400 GeV/c proton beams. More than 3 million bubble chamber pictures were taken with a triggered cross section 75% of the total inelastic cross section. Events containing charm particles were triggered with an efficiency of 98% + 2% - 3%. With the fiducial volume trigger, the probability for a picture to contain an interaction in the visible hydrogen increasing from 47.3% to 59.5% reducing film cost and processing effort by 20%. The improvement in data acquisition rate is shown to be negligible.
- Publication:
-
Unknown
- Pub Date:
- May 1985
- Bibcode:
- 1985natr.book.....B
- Keywords:
-
- Actuators;
- Bubble Chambers;
- High Energy Interactions;
- Proton Beams;
- Charm (Particle Physics);
- High Speed Photography;
- Particle Trajectories;
- Trigger Circuits;
- Nuclear and High-Energy Physics