Instructions for running the Inner Tracker
Responsible for this sheet:
Carsten Krauss e-mail:firstname.lastname@example.org, phone: 2540
The inner tracker slow control system now has an automatic error
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.
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:
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:
- Wait for about 40 seconds.
- If the problem is persistent, open the GUI for the
"High Voltage GEM" process and connect. Then click the Expert
button and select the RESET menu option. A "Reset" window will pop up.
Just press the Button "Reset" at the lower right corner of
the window. Then wait for 30 seconds (it's a SLOW CONTROL
- Close the GEM GUI.
- Open the "High Voltage Current" GUI and change the State
from ON to OFF. Wait until the change of states is
complete (both the "old state" and the "new state" are OFF).
Next change the State back to ON.
- The alarm in the "High Voltage" process will usually go away
after another 60s. If not, call the inner
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!
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
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
If you want to know more about the inner tracker have a look at the ITR
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
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
Remember that you will have to switch it off BEFORE the wires are
If you don't understand any of the instuctions or don't know what to do
call the on call
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
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
If the "High Voltage" process remains ON, follow the instructions on top of this page.
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.
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.
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.
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