1. PXD Alarms
Florian Lütticke

2. Sources

3. Minor Alarm: Deviation from normal condition which do not directly
What is an Alarm?
Major alarm: A state which might be harmful for the PXD hardware OR might yield to bad data
Not automatically recoverable
Needs detector operation to stop immediately
Needs (manual) shifter intervention
Minor Alarm: Deviation from normal condition which do not directly
Needs shifter intervention (perhaps at next run stop)
Does not need detector operation to stop.
Example:
Loosing a link to the DHP
NOT AN ALARM: Script for automatic link recovery needed.
Automatic link recovery can’t recover link
What should the shifter do?

4. Alarm Reasons System safety Data quality Data transport
Environment sensors
Component power supply issues (Primary PS, DHH power/temp, ONSEN power/temp) -> Major alarms
PXD Voltages ( anything in voltage limit, strange currents etc.) -> Major and Minor alarms
Data quality
Data transport

5. Alarm Reasons System safety
Data quality -> Mostly Minor alarms, should come from Express Reco or BonnDAQ
Raw data differs from uploaded pedestals
Common mode is large
High occupancy -> Major alarm when extremely high!
(unmasked) Hot pixels -> Major if many or strange pattern appears
Cluster signal differs from expectation
Frame size (bytes or hits)
Number of frames vs number of triggers
Data transport

6. Data transport Either automatic correction or Major Alarm
Alarm Reasons
System safety
Data quality
Data transport Either automatic correction or Major Alarm
DHP->DHE
DHE->DHC
DHC->ONSEN
DATCON->ONSEN
HLT->ONSEN
FTSW(Trigger)->DHC
ONSEN->EVB
DHH Internal links
ONSEN Internal links
DATCON Internal links
Trigger missmatches, full buffers, crc errors,

7. Minor Alarms
Use as “reminder” of what the shifter has to do before the next run starts. E.g.:
Pedestals need to be refreshed
Noisy pixel need to be updated
For Pedestals: We should implement an alarm which already tells if taken pedestals are ok
Kind of an expert system judging the calculated pedestals and giving advice to the shifter.
Pedestal too low/high
Increase gate_onX or Increase SubIn/SubOut
Redo Offsets

8. Major Alarm on too high/low DCD voltages, DHP voltages
PXD Voltages - Alarms
Major Alarm on too high/low DCD voltages, DHP voltages
Minor Alarm on Source current (could be due to radiation damage)
Which alarm for steering voltages? (Major?)

9. Alarms should have a “solution hint”, which the shifter could try.
TODO:
This is just a start.
We need to define individual alarms.
Alarms should have a “solution hint”, which the shifter could try.