Instructions for running the Inner Tracker

Responsible for this sheet:
Carsten Krauss, phone: 2540

on-call expert


The inner tracker slow control system now has an automatic error recovery implemented. This does however not mean that no alarms occur. It means that inner tracker alarms are recovered by the internal error recovery system first.

This means before you start ANY intervention with the system, please let the error recovery try to automatically recover the problem first.

This needs 1-3 minutes. Don't interfere with the system during that time. If the problem is more severe the system still needs shift crew or even expert intervention.

Never stop or kill any of the inner tracker high voltage processes unless you are told so by an expert. This will stop the inter-process communication between our high voltage processes and nothing will work as a consequence.

The most common problems with the inner tracker Slow Control System are described here:

Target Spikes

After a big spike in the interaction rate, the inner tracker produces alarms in the "High Voltage Current", "High Voltage" and "High Voltage GEM" processes. This is a problem that normally can not be recovered by the automatic recovery procedure in the system. If this happens follow these steps:

Alarm in High Voltage Process

This is the most common problem right now. To slove it either call the expert or do the following two steps:
1. Open the user interface of the 'ITR/High_Voltage_GEM' process. Locate the channels with no Voltage and reset one channel of each group (if for example i/h/g/13/2/xxx channels are off select i/h/g/13/2/++2) and reset this channel(s) with the Reset window that you can find in 'Expert|Reset'.
2. Open the 'ITR/High_Voltage_Current' user interface and set the state to "OFF" and then back to "ON". When the "OFF" state has been reached, the "ITR/High_Voltage" process should again start to ramp up the affected channels and stop to be in alarm.

Low Voltage Alarm

If the a chip power in the Inner Tracker Low Voltage process goes into an alarm, call the inner tracker expert at any time (except if you know there will be no more data taking for the rest of the night and you immediatly write a mail to the expert). The reason for this inconvenient (for us) procedure is that we have to reprogram the helixes of the station which has lost the power. You can switch on the Low Voltage again, but note which power supply was off, the expert will ask you this!

ITR HV does not switch off

If the Inner Tracker Slow Control (especially the High Voltage) is in an internal state transition (to recover a problem) while you switch the high voltage from READY to SAFE the transition can be lost. This is potentially very dangerous and has to be monitored closely! If this happens, open the "High Voltage" GUI and connect it. Then manually change the state from "ON" to "INJECTION". Wait until the state transition is complete before you release the injection veto.
If the high voltage still can not be switched off (whatever reason) press the red button at the Hardware control panels. There is a direct line going down to the High Voltage Power Supply inhibiting the HV when the button is pressed. You will get no reply on the panel. If you had to press this button call the expert to recover the system. Make sure the button remains in as long as the slow control system is in a bad state.

If you want to know more about the inner tracker have a look at the ITR Homepage. --
Or if you want to something specific write a mail to the inner tracker group


  • How to switch the detector on
  • How to switch the detector off
  • How to know that the detector is on and ready
  • How to know that the detector is properly synchronized
  • How to know that the data from this detector is sensible
  • What to do if I don't understand the instructions on this page

    How to switch the detector ON

    The switching on of the Inner Tracker right now is safe. So once "LUMINOSITY RUN" appears on the HERA monitor, switch the inner tracker to "READY". The ITR is included in the common slow control, just switch it on with everything else.
    If you have any questions call the inner tracker chamber expert. Remember that you will have to switch it off BEFORE the wires are extracted.
    If you don't understand any of the instuctions or don't know what to do call the on call expert


    How to switch the detector off

    The inner tracker is switched off together with the all other detectors by changing the state of the Central Slow Control (CSC) from "READY" to "SAFE".

    Central Slow Control Main Window
    Please note that the inner tracker has some special state transition tables, the states of ITR sub-processes have different names such as "ON" instead of "READY" and "INJECTION" instead of "SAFE". This is a consequence of the ramping scheme the inner tracker needs to be safely operated. In addition to these different names there are also additional states as "ON NOT READY" and "SOMETHING ON".
    Please make sure the inner tracker is in "SAFE" mode with all processes. It has been observed, that the high voltage process does not change from "ON" to "INJECTION" when the internal error recovery is active while you switch the system off. If that happens follow the instructions above.
    It takes about 5 mins until the user interface displays that it is in the SAFE state.
    You HAVE TO wait for that time - it takes just this time to switch the inner tracker off.

    Do not release the injection veto before the complete system is in OFF state!
    If the "High Voltage" process remains ON, follow the instructions on top of this page.


    How to know that the detector is on and ready

    To see, if the detector is in the right state, check all inner tracker slow control processes. If all are ON respectively READY-state and none are excluded from control, the system is ready.
    The Inner Tracker part of the "Process State Display" should look like this:

    If you have further questions, call the on-call expert.


    How to know that the detector is properly synchronized

    Check in the DQ histos in the global section of the histograms: There is a page with eight correlation plots the two on the right are showing the correlation between inner tracker and VDS (upper plot) and OTR (lower plot). If you see a correlation, the inner tracker is running synchronous.


    How to know that the data from this detector is sensible

    The inner tracker has a number of DQ histogram in the DQ system that can be checked. Right now we are still waiting for the training to be finished, so that we can publish some reference histograms for the shift crew to compare. If you are in doubt about the quality of the data taken, please call the inner tracker expert.


    What to do if I don't understand the instructions on this page

    If you feel it could adversely affect the quality of the data being taken, contact the on-call expert. In any case, send an e-mail to the responsible for this page.


    Last modified: Wed Dec 18 15:32:07 MET 2002 by C. Krauss