IFR Trickle Injection June 2003

Problems with last experience of Trickle Injection
(Old Forward Endcap)

• Main problems were trips of LV PS (also some trips of the HV)

New Forward Endcap

• New HV distribution and new LV PS!
• During normal run we had a problem with LV PS.

Problems which could appear with Trickle Injection in June:

• Trip of HV PS ---> mainly in external layers ---> reset from epics (as usual).
• Trip of LV PS ---> mainly external layers could be the cause ---> reset from switches in EH. We will provide clear labels and instructions.
• There is also a risk that we need to go in!

Plan for Trickle Injection

• IFR will start with external layers (13-16) OFF.
• Monitoring of the behavior of HV (currents, trips...) for layers 1-12.
• Monitoring of the behavior of LV PS.
• We will procede step by step to turn ON external layers
---> each time monitoring the behavior.
• The idea is try to turn ON also external layers,
---> but at this moment we don't know if it is possible to do.
• We will have to monitor FEC occupancy versus time behavior, in order to check if dead FECs occour after the trickle injection.