The BBL3 Interface


Expert information is presented here.

The following signals of the BBL3 system are of concern for the BST:

A VME controlled module housed in the BST Slow Control Crate (rack 10 in aisle B of the trailer's first level, second crate from bottom) drives the 4 BST status messages.

"...hv_power_bst_pad",
"...hv_power_bst_strip",
"...bst_voltage_stat_pad" and
"...bst_voltage_stat_strip",
where the "...voltage_stat..." is displayed at the CDAQ detector panel by dedicated LEDs for BST-Pad and BST-strip respectively. These LEDs are lit green only if the appropriate detector part is fully operational.
The two other signals represent the detector parts' power supply status.

The least two signals originating from other H1 components (Silicon Tracker Cooling Mobile and Lund Radiation Monitor) are watched by the BST Pad Control. If a radiation alarm is issued the Pad Detectors' Depletion Voltage is immediately switched off. This is done hardwired on the repeater card; software interaction is not required. Once the BST Slow Control Application is running the failure will be displayed and properly handled however.
In case the water flow in the BST cooling circuit causes an alarm the main power supplies of the BST Pad Detectors will be interrupted. As before this is done hardwired: by relays inside the PDS module. Consequently the heat load generated inside the BST structure is dramatically reduced. Of course the failure will also be displayed and handled by the BST Slow Control Application. Both alarms require dedicated actions on the Slow Control Panel to be cleared.

The following table summarizes the understanding of the respective BBL3 alarms or warnings.

BBL3 understanding signal ok. warning/alarm
...hv_power_bst_pad pads powered, no error either: pads OFF
(STANDBY, READY or ON) or: pads not OFF - then: any subsystem error
...hv_power_bst_strip either: strips ON, no error when strips ON: power supply error
or:strips OFF  
...bst_voltage_stat_pad pads operational either: pads not ON
(ON, no errors) or: pads ON - then: any subsystem error
...bst_voltage_stat_strip strips operational either: strips not ON
(ON, no errors) or: strips ON - then: power supply error

The controlled subsystems for the pad detectors are:

  • temperature measurement,
  • supply voltages & currents measurement (11 supplies in 2 systems),
  • water flow (spy signal on bst cooling station),
  • radiation monitor (spy signal on radiation monitor),
  • trigger configuration (XILINX logic),
  • trigger thresholds and
  • detector bias currents.
    The controlled subsystems for the strip detectors are:
  • power converter boxes.

    Back to the Shift Instructions.

    To the BST site.

    © by Hans Henschel, 05-oct-98, last revised: 07-mar-00