<h1><center>Analysis of an FPA in an 60A Circuit</center></h1>
The LHC comprises a total of 376 pairs of horizontal and vertical orbit correctors which are installed at each focusing and defocusing main quadrupole magnet in the arcs. Quenches on 60 A magnets are detected by the power converter through magnet impedance growing. In addition, the power converter also provides current lead protection. The Figure below shows the circuit diagram of the 60 A arc orbit correctors.
source: Test Procedure and Acceptance Criteria for the 60 A Circuits, MP3 Procedure, <ahref="https://edms.cern.ch/document/874724/">https://edms.cern.ch/document/874724/</a>
%% Cell type:markdown id: tags:
# Analysis Assumptions
- We consider standard analysis scenarios, i.e., all signals can be queried. Depending on what 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 an 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
- Scales are labeled with signal name followed by a comma and a unit in the square bracket, e.g., I_MEAS, [A]
- 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.
- The grid comes from the left axis
- Title contains timestamp, circuit name, signal name allowing for re-access the signal.
- The plots assigned to the left scale got 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.
- If an axis has a single signal, change color of the label to match the signal's color. Otherwise, the label color is black.
In order to perform the analysis of a FPA in an IPQ circuit please:
1. Select circuit name prefix (e.g., RQ5)
2. Choose start and end time
3. Choose analysis mode (Automatic by default)
Once these inputs are provided, click 'Find FGC PM entries' button. This will trigger a search of the PM database in order to provide a list of timestamps of FGC events associated with the selected circuit name for the provided period of time. Select one timestamp from the 'FGC PM Entries' list to be processed by the following cells.
**Note that 24 hours is the maximum duration of a single PM query for an event. To avoid delays in querying events, please restrict your query duration as much as possible.**
analysis.results_table['FPA Reason']=get_expert_decision('Reason for FPA: ',['QPS trip','Converter trip','EE spurious opening','Spurious heater firing','Busbar quench','Magnet quench','HTS current lead quench','RES current lead overvoltage','Unknown'])
```
%% Cell type:code id: tags:
``` python
analysis.results_table['Type of Quench']=get_expert_decision('Type of Quench: ',['Training','Heater-provoked','Beam-induced','GHe propagation','QPS crate reset','Single Event Upset','Short-to-ground','EM disturbance','Unknown'])
<h1><center>Analysis of an FPA in an 80-120A Circuit</center></h1>
Figure below shows the electrical diagram of the 80-120 A corrector circuits including the connection to the PC. It’s important to note the positioning of the crowbar with respect to the DCCTs. During a power abort the current will transfer from the PC into the crowbar and the measured current (I_MEAS) goes immediately to almost 0 A, and is therefore not representative for the current in the cold part of the circuit including the magnet. Note that there is no QPS present in these circuits but that the PC will shut-down in case of overvoltage.
source: Test Procedure and Acceptance Criteria for the 80 A and 120 A Dipole Corrector Circuits, MP3 Procedure, <ahref="https://edms.cern.ch/document/874722/">https://edms.cern.ch/document/874722/</a>
%% Cell type:markdown id: tags:
# Analysis Assumptions
- We consider standard analysis scenarios, i.e., all signals can be queried. Depending on what 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 an 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
- Scales are labeled with signal name followed by a comma and a unit in the square bracket, e.g., I_MEAS, [A]
- 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.
- The grid comes from the left axis
- Title contains timestamp, circuit name, signal name allowing for re-access the signal.
- The plots assigned to the left scale got 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.
- If an axis has a single signal, change color of the label to match the signal's color. Otherwise, the label color is black.
In order to perform the analysis of a FPA in an IPQ circuit please:
1. Select circuit name prefix (e.g., RQ5)
2. Choose start and end time
3. Choose analysis mode (Automatic by default)
Once these inputs are provided, click 'Find FGC PM entries' button. This will trigger a search of the PM database in order to provide a list of timestamps of FGC events associated with the selected circuit name for the provided period of time. Select one timestamp from the 'FGC PM Entries' list to be processed by the following cells.
**Note that 24 hours is the maximum duration of a single PM query for an event. To avoid delays in querying events, please restrict your query duration as much as possible.**
analysis.results_table['FPA Reason']=get_expert_decision('Reason for FPA: ',['QPS trip','Converter trip','EE spurious opening','Spurious heater firing','Busbar quench','Magnet quench','HTS current lead quench','RES current lead overvoltage','Unknown'])
```
%% Cell type:code id: tags:
``` python
analysis.results_table['Type of Quench']=get_expert_decision('Type of Quench: ',['Training','Heater-provoked','Beam-induced','GHe propagation','QPS crate reset','Single Event Upset','Short-to-ground','EM disturbance','Unknown'])
<h1><center>Analysis of a PIC2 Test in an IPD Circuit</center></h1>
Superconducting beam separation dipoles of four different types are required in the Experimental Insertions (IR 1, 2, 5 and 8) and the RF insertion (IR 4). Single aperture dipoles D1 (MBX) and twin aperture dipoles D2 (MBRC) are utilized in the Experimental Insertions. They bring the two beams of the LHC into collision at four separate points then separate the beams again beyond the collision point. In the RF Insertions two types of twin aperture dipoles, each type with two different aperture spacings are used: D3 (MBRS) and D4 (MBRB). The D3 and D4 magnets increase the separation of the beams in IR 4 from the nominal spacing 194 mm to 420 mm. D2 and D4 are the twin apertures magnets with common iron core for both apertures. D3 is a twin apertures magnet with independent iron cores for each aperture.
The MBRC dipole consists of two individually powered apertures assembled in a common yoke structure.
- MBX – D1
Single aperture of the magnet powered with one power supply.
- MBRC – D2
- MBRB – D4
Apertures B1 and B2 of the magnet are powered in series with one power supply.
- MBRS - D3
Apertures B1 and B2 of the magnet are powered in series with one power supply but series connection done in the DFBA.
|Magnets in the Circuit|Temperature|Position|General information|
The aim of this test is to check the current functioning of the powering interlock controller with standby current in the circuits.
The plot with the test below has been added for the sake of completeness. The detailed procedures for implementation of the interlock tests are subject to a detailed document, which will remain the reference for these tests (LHC-D-HCP-0002).
<center>IPD currents during PIC2. Note: the actual parameters are listed in Appendix 1.</center>
source: Test Procedure and Acceptance Criteria for the Separation Dipoles Circuits, MP3 Procedure, <ahref="https://edms.cern.ch/document/874885">https://edms.cern.ch/document/874885</a> (Please follow this link for the latest version)
%% Cell type:markdown id: tags:
# 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.
- 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
- 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 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 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).
- 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.
u_hds_dfss = query.query_qh_pm(source_timestamp_qds_df.drop_duplicates('source') if not source_timestamp_qds_df.empty else pd.DataFrame(), signal_names=['U_HDS'])
u_hds_dfs = u_hds_dfss[0] if u_hds_dfss else []
# # Reference
u_hds_ref_dfss = query.query_qh_pm(source_timestamp_qds_df.drop_duplicates('source') if not source_timestamp_qds_df.empty else pd.DataFrame(), signal_names=['U_HDS'], is_ref=True)
u_hds_ref_dfs = u_hds_ref_dfss[0] if u_hds_ref_dfss else []
# LEADS
u_hts_dfs = query.query_leads(timestamp_fgc, source_timestamp_qds_df.drop_duplicates('source') if not source_timestamp_qds_df.empty else pd.DataFrame(), system='LEADS', signal_names=['U_HTS'], spark=spark, duration=[(t_end-t_start, 'ns')])
u_res_dfs = query.query_leads(timestamp_fgc, source_timestamp_qds_df.drop_duplicates('source') if not source_timestamp_qds_df.empty else pd.DataFrame(), system='LEADS', signal_names=['U_RES'], spark=spark, duration=[(t_end-t_start, 'ns')])
'QDS_A':source_timestamp_qds_df.loc[0, 'timestamp'] if len(source_timestamp_qds_df) > 0 else float('nan'),
'QDS_B':source_timestamp_qds_df.loc[1, 'timestamp'] if len(source_timestamp_qds_df) > 1 else float('nan')}
```
%% Cell type:markdown id: tags:
# 3. Timestamps
The analysis for MP3 consists of checking the existence of PM events and of consistency of the PM timestamps (PC, QPS). The criterion of passing this test described in detail in 600APIC2.
In short the following criteria should be checked:
- The PC timestamp (51_self) is QPS timestamp +-20 ms.
- The difference between QPS board A and B timestamp = 1ms.
If one or more of these conditions are not fulfilled, then an in-depth analysis has to be performed by the QPS team.
