D0 Radiation Monitoring
and SMT Safety System
Shift Procedure for SMT Radiation Monitoring
SMT radiation dose is monitored through
two systems: BLMs (Beam Loss Monitors) and Fingers (silicon diode detectors
residing inside the SMT). The BLM system is the primary protection system.
It generates alarm and abort signals according to preset thresholds. Both
the instantaneous and integrated doses are reccorded and can be monitored
through ACNET interface of the system (E35) or the radmon GUI. One of the integrating devices
(D0BRUT) is monitored by MCR for making manual trip decisions for integrated
doses. The SMT Finger system provides detailed dose monitoring through
EPICS and can be used to analyze losses in more detail than the BLM system.
Start E35 ACNET page for BLM monitoring (if
it's already not running) on the ACNET console.
Start radmon GUI (if it's already not running) from any online machine, e.g., d0ol65
Linux:onl-> setup d0online
Linux:onl-> ./RadMonGui.py &;
On E35 page, make sure that all the devices
are enabled: green EN should show for each device. A LAM state indicates
an alarm condition. If this occurs call the experts.
At the start of shot setup or store, note down
the integrated dose values from the E35 page in the logbook. Monitor the
change in these values and inform the shift captain if any of the values
reaches the manual abort threshold (shot setup: 2krad, store: 3krad). Shift
captain would then request MCR to abort the beam. D0-OP_SMT-010
(D0 Silicon Detector Radiation Protection) gives instructions on beam alarm
The radmon GUI consists of a main GUI window and a global plotter
(see GUI description for details and screen shots).
At the start of each activity (e.g., shot setup, store, beams studies) reset the diode integrated dose by clicking on Dose Reset buttons on main GUI and global plotter windows. This will provide a reference to keep track
of accumulated dose during the MCR activity.The integrated BLM dose is reset by MCR.
If beam alarm or abort occurs, take a screen shot of global plotter by clicking on the Create Image button.
If any of the parameters found on the two windows turns red, follow the troubelshooting
High integrated dose: If the integrated dose on radmon GUI is
not reset, it might cross alarm and warning thresholds. Therefore it is recommended that it is reset at the start of
each activity. If there are less than 3 diodes on each of the disks that are showing high dose, it is probably due to
wrong pedestal in the database. In this case email the radmon expert.If, however, several diodes are accumulating
very high dose then call the radmon expert immediately. Also cross check with the BLM data on ACNET E35 page.
High instantaneous dose: If the instantaneous dose on less than 3
diodes on each of the disks that are red (warning), it is probably due to wrong pedestal in the database. In this case
email the radmon expert.If, however, several diodes are showing high instantaneous dose, call the radmon expert immediately.
Also cross check with the BLM data on ACNET E35 page.
GUI does not start: If the GUI does not start even after repeated
attempts, call the radmon expert.
Frontend LAM state: The frontend processor might need reboot.
Call the radmon expert for instructions.
Out of bound BLM HV: Check the NIM crate power on M303 (first crate
from top). If that is ok, call the radmon expert IMMEDIATELY.
Pengfei Ding (currently on call)
Last modified: Mon Jan 09 09:20:00 CST 2011