source: Test Procedure and Acceptance Criteria for the 13 kA Quadrupole (RQD-RQF) Circuits, MP3 Procedure, <ahref="https://edms.cern.ch/document/874714">https://edms.cern.ch/document/874714</a> (Please follow this link for the latest version)
source: Test Procedure and Acceptance Criteria for the 13 kA Quadrupole (RQD-RQF) Circuits, MP3 Procedure, <ahref="https://edms.cern.ch/document/874714">https://edms.cern.ch/document/874714</a> (Please follow this link for the latest version)
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# Analysis Assumptions
# Analysis Assumptions
- We consider standard analysis scenarios, i.e., all signals can be queried. If a signal is missing, an analysis can raise a warning and continue or an error and abort the analysis.
- We consider standard analysis scenarios, i.e., all signals can be queried. If a signal is missing, an analysis can raise a warning and continue or an error and abort the analysis.
- It is recommended to execute each cell one after another. However, since the signals are queried prior to analysis, any order of execution is allowed. In case an analysis cell is aborted, the following ones may not be executed (e.g. I\_MEAS not present).
- It is recommended to execute each cell one after another. However, since the signals are queried prior to analysis, any order of execution is allowed. In case an analysis cell is aborted, the following ones may not be executed (e.g. I\_MEAS not present).
# Plot Convention
# Plot Convention
- Scales are labeled with signal name followed by a comma and a unit in square brackets, e.g., I_MEAS, [A].
- Scales are labeled with signal name followed by a comma and a unit in square brackets, e.g., I_MEAS, [A].
- If a reference signal is present, it is represented with a dashed line.
- If a reference signal is present, it is represented with a dashed line.
- If the main current is present, its axis is on the left. Remaining signals are attached to the axis on the right. The legend of these signals is located on the lower left and upper right, respectively.
- If the main current is present, its axis is on the left. Remaining signals are attached to the axis on the right. The legend of these signals is located on the lower left and upper right, respectively.
- The grid comes from the left axis.
- The grid comes from the left axis.
- The title contains timestamp, circuit name, and signal name allowing to re-access the signal.
- The title contains timestamp, circuit name, and signal name allowing to re-access the signal.
- The plots assigned to the left scale have colors: blue (C0) and orange (C1). Plots presented on the right have colors red (C2) and green (C3).
- The plots assigned to the left scale have colors: blue (C0) and orange (C1). Plots presented on the right have colors red (C2) and green (C3).
- Each plot has an individual time-synchronization mentioned explicitly in the description.
- Each plot has an individual time-synchronization mentioned explicitly in the description.
- If an axis has a single signal, then the color of the label matches the signal's color. Otherwise, the label color is black.
- If an axis has a single signal, then the color of the label matches the signal's color. Otherwise, the label color is black.
Table below provides timestamps ordered achronologically and represents the sequence of events that occurred in the analyzed circuit: PIC_RQD, PIC_RQF, iQPS, nQPS, FGC_RQD, FGC_RQF, EE_RQD, EE_RQF and optionally LEADS_RQD and LEADS_RQF, provided they exist. Note that for iQPS and nQPS only the first timestamp is reported. Tables with all iQPS and NQPS timestamps are presented in the section dedicated to magnet and quench protection analysis. The table also contains time difference in milliseconds from the first event and from the FGC event.
Table below provides timestamps ordered achronologically and represents the sequence of events that occurred in the analyzed circuit: PIC_RQD, PIC_RQF, iQPS, nQPS, FGC_RQD, FGC_RQF, EE_RQD, EE_RQF and optionally LEADS_RQD and LEADS_RQF, provided they exist. Note that for iQPS and nQPS only the first timestamp is reported. Tables with all iQPS and NQPS timestamps are presented in the section dedicated to magnet and quench protection analysis. The table also contains time difference in milliseconds from the first event and from the FGC event.
In short, the following criteria should be kept:
In short, the following criteria should be kept:
- The PC timestamp (51_self) is QPS time stamp +/-20 ms.
- The PC timestamp (51_self) is QPS time stamp +/-40 ms.
- Time stamp difference between FGC and EE: 100±15 ms
- Time stamp delay between PIC and EE: 100±15 ms
If one or more of these conditions are not fulfilled, then an in-depth analysis has to be performed by the QPS team.
If one or more of these conditions are not fulfilled, then an in-depth analysis has to be performed by the QPS team.
Table below contains reference timestamps of signals used for comparison to the analyzed FPA. The reference comes as the last PNO.b3 HWC test with activation of EE systems and no magnets quenching.
Table below contains reference timestamps of signals used for comparison to the analyzed FPA. The reference comes as the last PNO.b3 HWC test with activation of EE systems and no magnets quenching.
Naturally, this formula only applies to exponential decayed characterised by a time constant. Nonetheless, for pseudo-exponential decays, this formula gives a notion of the change of the characteristic time $\tilde{\tau}$. For a circuit we compute the time-varying characteristic time as
Naturally, this formula only applies to exponential decayed characterised by a time constant. Nonetheless, for pseudo-exponential decays, this formula gives a notion of the change of the characteristic time $\tilde{\tau}$. For a circuit we compute the time-varying characteristic time as
- Check if the characteristic time of the pseudo-exponential I_MEAS decay from t=1 to 100 s is 25 s< Tau < 35 s
- Check if the characteristic time of the pseudo-exponential I_MEAS decay from t=1 to 100 s is 25 s< Tau < 35 s
*GRAPHS* (one for each circuit):
*GRAPHS* (one for each circuit):
- The main power converter current (reference and actual) on the left axis, I_MEAS
- The main power converter current (reference and actual) on the left axis, I_MEAS
- The characteristic pseudo time constant calculated for the main current (reference and actual) on the right axis, -I_MEAS/dI_MEAS
- The characteristic pseudo time constant calculated for the main current (reference and actual) on the right axis, -I_MEAS/dI_MEAS
The actual characteristic pseudo time constant contains discrete steps, which indicate a quenching magnet (decreasing L, increasing R); note that for the reference one the steps are not present (no quench).
The actual characteristic pseudo time constant contains discrete steps, which indicate a quenching magnet (decreasing L, increasing R); note that for the reference one the steps are not present (no quench).
- Timing of PIC abort, FGC timestamps, the maximum currents, and the characteristic times are reported next to the graph.
- Timing of PIC abort, FGC timestamps, the maximum currents, and the characteristic times are reported next to the graph.
- t = 0 s corresponds to the respective (actual and reference) FGC timestamps.
- t = 0 s corresponds to the respective (actual and reference) FGC timestamps.
