2. Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
4th Workshop of the Spanish Traineeship Programme FTEC 2015
Alejandro Fernandez Navarro
Supervisor: Arjan Verweij
TE-MPE-PE
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

3. Outline
Motivation for the studies on Quench Protection Systems of HL-LHC magnets
Overview of the work done
FTEC professional experience and feedback
FTEC personal experience
Annex
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

4. Coupling losses (heat)
Motivation for the studies on Quench Protection Systems (QPS) of HL-LHC magnets
New magnets and superconducting materials (N b 3 Sn)
MQXF T
New QPS technology CLIQ (Coupling-Loss Induced Quench)
Current change
Magnetic field change
Coupling losses (heat)
Temperature rise
Quench
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

5. Testing and model validation
Overview of the work done (1/3)
Modelling
Simulating
Testing and model validation
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

6. Testing and model validation
Overview of the work done (2/3)
Modelling
MQXF
FCC Block coil
FCC C-C MB D1 D2
11 T
Simulating
Failure scenarios analysis: D1, D2, 11 T
Predictions for test campaigns (Test plan writing)
MB, MQXFS
Design of CLIQ-based QPS
D1, D2, 11 T
Testing and model validation
CLIQ on MQXFS test campaign
MB, MQXF, 11 T model validations
CLIQ on MB test campaign
(Report writing)
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

7. Overview of the work done (3/3)
Reliability-Availability analysis of QPS for HL-LHC
Failure Modes and Effect Analysis (FMEA)
Markov model in Isograph Reliability Workbench
Testing of the STEAM framework
Co-Simulation of Transient Effects in Superconducting Accelerator Magnets
1D Electrothermal
2D Electromag.Thermal
2D Mechanical
Electrical
Controller
PSpice
Simulations Coupling (Java/MpCCI)
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

8. FTEC professional experience
FTEC feedback
Unique opportunity for young Spanish engineers to get professional experience in the world largest particle physics laboratory.
Thanks to all the people involved in the organization, and specially to the Ciemat organizers that worked very hard to see the program coming true!
Critique: CERN, PLEASE GIVE FRENCH COURSES TO THE FTECs!
All levels should be granted, from A0 to C1.
This is not peanuts: Encouraging integration Vs. segregation in Geneva society
FTEC professional experience
Warm reception and quickly integration in the Section.
Working in very interesting projects and progressive acquisition of responsibilities: Author of 1 paper, 2 posters 1 test plan and 2 CERN reports. Co-author of 6 papers.
Thanks to Arjan and to my colleagues for the excellent working environment!
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

9. FTEC personal experience
FTEC friends, my small family
CERN community, my big family
Sestriere 2017
Zermatt 2016
CERN boxing club
Afterworks in R1
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

10. Thank you for your attention!
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

11. Annex
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

12. Overview of the work done
TALES
STEAM
STEAM features testing and validation
FEM geometry modelling (several iterations), Java generated Pspice netlist (support), Electromagnetic features of the 2D workflow (support)
Design of CLIQ-based MPS
Connection config. Parametric studies, circuits decoupling after CLIQ discharge, self-protection studies
D1, D2, Q4, 11T (CLIQ-QH), (MQXF support to E.R.), T0 (STEAM valid.)
Magnet modelling
ROXIE sims. Matlab postproc. Circuit schem. Coil connection
D1, D2, Q4, MQXF, 11T MB (LHC), T0 (STEAM valid.)
FEM magnet modelling
And magnetic field simulation
FCC block coil (old and new versions), FCC common coil, MB, MQXF
Model validation
MB (Against measurements), 11T (Against ROXIE)
MPS Dependability studies
Failure scenarios analysis
Idenfication and modelling of CLIQ failure modes and worst failure combinations. Single magnet and chain studies.
D1, D2, 11T (CLIQ-QH), (MQXF support to E.R.)
Supporting
studies
Study of the impact of a CLIQ discharge on the MQXF magnetic field
Study of appropriate connection config. From pulse transformers to thyristors
Study of the total CLIQ failure rate and price depending of redundancy level
QDS connection config. for the HL-LHC Triplets
FMEA of a CLIQ-based MPS of D1 of HL-LHC
Calculation of probability of failure modes (Reliability analysis): Identification of CLIQ components failure modes and their combinations; calculations of the components failure rates (IRW).
Study of the appropriate capacitor bank configuration
Dependability study for MPS of HL-LHC
Including magnet quenches, monitoring systems and maintenance strategies
Quench rate calculation; Proof of concept model: Analytical, RBD (IAW) and Markov (Matlab and IRW) methods
CLIQ leads dimensions study for the HL-LHC Triplets
14/06/2017
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez

13. FMEA of a CLIQ-based QPS for D1 of HL-LHC
Study of the circuit schematic of a CLIQ unit to calculate failure rates
TC power supply
Redundant power supply (?)
Trigger card
Redundant circuit (?)
Capacitor charger
Pulse transformer
Redundant transformer (?)
Capacitor bank
(1,2 parallel/series,4?)
Bi-directional thyristor
Redundant thyristor (?)
Courtesy of Joaquim Mourao
14/06/2017
Dependability Analysis of a QPS
A. Fernandez

14. Total CLIQ failure rate and price depending on redundancy level
(The series production of the CLIQ units will significantly reduce these estimated prices)
Other considerations taken into account for the final decision, like possible open-circuit failures in connection points
Dependability Analysis of a QPS
A. Fernandez

15. Modelling, simulating, testing
Input
- Geometric design
- Cable data
- Material properties
Simulating
Excel file: Electrical circuit,
geometry, magnetic field map,
cable and material properties
Testing and model validation
Output
- Magnetic field map
ROXIE simulations
(magnetic field calculations)
MATLAB post-processing
Output results
Figures
GIF animations
Data files
TALES
Matlab application for electro-thermal dynamic simulations
Analysis of results
Comparison and model validation
Predictions
SM18
(Magnet Test Facility of CERN)
Measurements
Modelling and testing of circuit protection of new superconducting magnets for the HL-LHC project
A. Fernandez