D0 Radiation Monitoring and SMT Safety System

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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.

Startup

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

from /projects/D0rad/gui
Linux:onl-> setup d0online
Linux:onl-> ./RadMonGui.py &;

Monitoring

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 and aborts.
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 guide.

Troubleshooting

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.

Experts

Michael Kirby
(630)840-2177 (work)
(630)965-1456 (cell)
kirby@fnal.gov

Ronald Lipton
(630)840-4132 (work)
(630)266-8242 (pager)
lipton@fnal.gov

This project is supported by the high energy physics department of the University of Nijmegen and NIKHEF.

Page maintained by: Michael Kirby

Last modified: Tue Mar 22 16:10:49 CST 2005