Troubleshooting
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Target computer freezes
If you are not sure, turn off beam, call the target expert. The present target control computer (the monitor is labelled "POLTARAC"; the CPU sits underneath the monitor behind the door at your feet; it is labelled "POL-TAR"). If the target control windows freeze, and does not respond to keyboard/mouse input, then < you can open the door at your feet and power off/on the computer. The computer will restart, and will not ask you for a username or password. You should open a terminal window and you should see that you are in the "poltar" account. Then do the following:
cd Screens ./tgtgui
and the target control GUIs should start.
VDC HV cannot turn on
Solution: go to http://hareboot22. User/password are on the paper near the whiteboard.
Reboot iocha22 and wait 5 minutes. Might have to restart the Tools GUI (usually not).
You lose network connectivity
- 192 Subnet: halladaq-cat [You cannot ping the crates in the hall, e.g. for ROC25(L-arm) or ROC26(R-arm) you cannot ping the respective IP (happex8, happex7). Also cannot ping spectrometer DAQ crates like hallasfi4]
- 193 Subnet: compton [You cannot ping the any Compton crate, cannot reboot them.]
- Control crates [Loss of network connectivity to controls IOCs]
For all of the above network problems, do the following to power cycle the respective network switch:
- Goto https://halla-pwr/
- Accept the certificate if asked.
- Username: halla-pwr
- Password: see the sheet near the white board in the counting room.
- Click "Power Management" on the left.
- You will see 9 outlets. Three are currently used:
- halladaq (192 DAQ subnet) -- full name is halladaq-cat
- hac-cat -- full name is hac-cat3550
- compton -- full name is compton-cat2950
- There is a bulb icon in column "outlet status". If the bulb is yellow the outlet is on. To power cycle the outlet, first turn it off by clicking the bulb (it will change to grey), wait a few seconds, then turn it back on again. This on/off will power cycle the network switch.
You lose a magnet controls IOC for an HRS
[The readbacks for either or both of the HRS magnets go white on the "Hall A Tools". Q1 will probably still read, it is on another IOC]
For the Left HRS:
- Click the IOC's GUI (from the "Hall A Main Menu")
- You will see that the iocha14 is whited out (don't worry about the "Rich detector" and "Waterfall Target" iocs being also whited out, we don't use them for PREX). If it is not whited out, you have some other problem.
- Under "Reboot" you will see the URL for the reboot for that IOC, in this case http://hareboot10.
- Go to a WWW browser, type in http://hareboot10 as the address, login: the username and password are both written on the piece of paper on the wall near the whiteboard.
- Select "Immediate Reboot", under "Control Action", for the outlet marked IOCHA14.
- Click "Apply"
- The green "ON" under State should changed to OFF.
- Wait a few minutes, then the readout for the magnets should reappear in Hall A Tools.
- Check the state of the magnets; if they are not ON and at the correct currents, then do the following:
From the HallA General Tools window, there is a P0 (central momentum) SET field for each spectrometer in which you can eneter the desired momentum setting. To change to a lower momentum from a higher previous setting, you just need to enter the momentum value, no worry about cycling the quads. To bring momentum setting up, you need to cycle the quads Q2 and Q3 of either arm. That is increasing the current of Left Q2/Q3 to 1600 A or 1400 for Right arm, wait for 2 minutes after they reach max, then tuning down the value to the desired setting. More detailed instructions are on the white board of the counting house. There's no need to cycle Q1, Dipole.
For the Right HRS:
- Go to the middle room, and look for the green button labelled "Right Spectrometer Controls VME"; it is at the lower right of the lower box of green reset buttons in one of the middle racks.
- Push the button, holding it for 3-4 seconds.
- Wait a few minutes, then the readout for the magnets should reappear in Hall A Tools.
- Check the state of the magnets; if they are not ON and at the correct currents, then do the same process as explained above for the left HRS.
HV EPICS for Beamline or L-HRS are white
Note, the R-HRS EPICS HV is semi-permanently white. Don't worry about it. See the opmanual for instructions on adjusting HV. If Beamline and/or L-HRS EPICS screen for HV shows white fields, you can reboot iocha11 and iocha22 via http://hareboot22. The user/password are on the "passwords" paper near the white board.
