Trigger and Readout

Prescale Records Every Nth Accepted Event

A prescale is a counting rule that records only every nth accepted trigger. Here 12 accepted events with a prescale of 3 produce 4 recorded events, then the audit checks that the recorded-event source still lines up with coverage, occupancy, centroid, and trigger roles. Real data-taking also has live-time limits, changing rates, synchronization, missed counts, and statistical uncertainty.

Prescale readout and the source ledger close the chain. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

A prescale records every third accepted event

There are 12 accepted events and a prescale of 3.

Nrecorded=12/3N_{\text{recorded}}=12/3
Prescaled readoutA prescale records every third accepted event.accepted=12 countrecorded=4 countacceptedEvents=12 countprescaleDivisor=3 countrecordedEvents=4 count

Four events are recorded

The exact recorded count is 4.

Nrecorded=4N_{\text{recorded}}=4
Prescaled readoutA prescale records every third accepted event.accepted=12 countrecorded=4 countacceptedEvents=12 countprescaleDivisor=3 countrecordedEvents=4 count

The reconstruction ledger cites each source

The audit keeps 5 checked source roles: coverage, occupancy, centroid, trigger, and recorded events.

Nsources=5N_{\text{sources}}=5
Detector spatial auditThe capstone cites coverage, occupancy, centroid, trigger, and readout.sources checkedcoverage citedoccupancy citedcentroid citedtrigger citedreadout cited