This is a description of what can be found in the unpacked MBS files.

DSSD

We have six DSSD in play. U2, U3, U4, U5, U6.

For each UX there is the following branching

• UXF
• UXFI
• UXF_E
• UXF_T
• UXB
• UXBI
• UXB_E

where F corresponds to the signal from the p-side and B to the signals from the n-side.

The I corresponds to the strip number starting from 1, E is the ADC value. For the P side we also have TDC information.

UXF/UXB contains the multiplicity i.e. how many strips had a signal.

PADS

We have four silicon pads in play. P2, P3, P4, P6.

For each PX there is the two branches

• PXE
• PXT

again E is the ADC, and T the tdc value.

The value 0 corresponds to no entry.

Scalers

• TRIGGER
  Which MBS trigger was firing. 3 corresponds to pedestals, 1 normal triggering.
• TPAT
  Bitmask of which detectors was triggering within a 100ns coincidence window.
  You should consult RIO_trigger.trlo for the numbering.
  Generally one can say that if trigger N fired then bit N is 1 i.e. if only U6_OR fired then the TPAT would be 1024 (2^10).
• TLOW/THIGH
  The event 64 bit timestamp in units of 10 ns.
  TLOW gives low 32 bit. THIGH the higher 32 bit.
• HTLOW/HTHIGH The event 64 bit heimtime timestamp in unit of 2.5ns.
  HTLOW gives low 32 bit. HTHIGH the higher 32 bit.
  The lowest 2 bits are interpolated, so one should divide 4 to get 10ns instead.
• TOTAL/ACCEPTED
  Total number of triggers received and the number that was accepted.
  Refer to this entry for how to estimate dead time.
• TPROTONS
  Time since last proton pulse in units of 10ns.