CERN Accelerating science

Notes from the Meeting on Commissioning for Electrical circuits

13 Nov 2003
Present: EH, RL, RS, ML

Test phases

1st phase: Test the PCs in short, without connection to the magnets.
2nd phase: Test the PCs connected to the magnets.

General CO facilities requested

We need control facilities:

• Switch on PC
• Read state info
• Set currents. PELP to min. stable current (phase 2) and then to nominal current (phase 1) to verify the quality of the joins .
• Timing. In the case of the battery tests, the PC groups need to be synchronized with the timing
• Stay at nominal
• Logging (temperatures, currents,+?) (freq of 1hz)
• Monitor the ramping up (PELP) as it progress (reading and displaying certain PC parameters).
• Measure, archive and monitor (FDs) currents, DFBs (?) voltages, interlock signals, water temperature per PC group. Some of those transient signals are monitored by the QPS system.
• Surveillance processes that monitor certain parameters (TBS) and send a warning to OP when there is a problem (Should be provide by PO surveillance process to the LASER system).
• If any of the 97 circuits exhibit a problem we need error reporting to find what went wrong.
• Pulse all magnets for a few cycles - what is a cycle in this context?
• Ramp down
• Switch off

Note 1:
These facilities would be applied to one PC, a group of PCs or all PC available. Grouping of PCs will be done according to types of operation and commissioning, i.e. in terms of type (600 A,..), geographic location.

Note 2:
Must be able to control the PC in terms of physics parameters (TBC), hardware magnitudes (strengths) and hardware settings (currents).
Battery tests
Quenches of certain magnets at low current will be provoked, and all signals (which ??) will be logged.
Reason: they would like to identify if the quenches were handled as expected, i.e. to make sure:
1. if quench heaters are effective,
2. if decayed normally as expected,
3. if any magnet is damaged.

Read the energy extraction from the quench magnets, decay currents.

This is a procedure that will be needed during normal operation, in addition to the PM analysis that will be done in case of a quench.

Req. for CO:
1. Signal Analysis tool (Data mining) that analyses a posteriori the signals data collected, compares their values to what theoretical expected and issues warnings if they are not the same:
a. The data gathering of all the signal is part of the PM system
b. The data analysis tool is not part of the PM system
c. It is important to define the format, which the data will be stored in, as it has a large bearing on the implementation of the analysis tool.
d. Experiments are using smt similar for data analysis and display ROOT.
e. Naming convention for signals must be agreed upon.

Single display system
Additional system related to Powering tests:
1. Protection system QPS
2. Interlocks (BIC, PIC)
3. Powering software
4. Cryogenics (status)
Req. for CO: It is required to have a general single display with information coming from several systems including the ones above. The measurement system should provide some of this information. The rest, like QPS is measured/stored in PVSS specific files. We should be able to recover this info and display it.