LMS trigger

The Light Monitoring System trigger will occur whenever the LMS sends a light pulse to the HYCAL detectors. This will be used as a separate trigger which can be individually prescaled so as to give control over the rate from the counting house. One caveat of the LMS is since it will light every detector in HYCAL, it will also cause $\pi ^o$ triggers. To avoid this, the $\pi^0$ logic programmed into the MLU modules will not fire when every strip fires as this will be assumed a LMS event.

Another concern of the LMS events is that since every channel is above threshold, all 1728 detectors will be read. The LMS events will therefore contain more than 10 times as much data from HYCAL as $\pi ^o$ events. For this reason, the LMS trigger rate will not exceed 1Hz ².