MOC - Hysteresis Modeling

Central hub for all hysteresis modeling work at CERN/SPS. Links together architectures, experiments, data, and operational deployment.

Current Focus 🎯

• Temporal Fusion Transformer optimization for SPS main dipoles
• Transfer learning and fine-tuning on MD data
• Real-time prediction deployment via sps-app-hysteresis

Architecture Development

Neural Architectures

• Temporal Fusion Transformer - Primary production model
• PhyLSTM - Physics-informed approach
• PETE - Physics-enhanced transformer encoder
• Neural ODE - Continuous dynamics modeling
• Transformer Encoder - Base transformer experiments

Model Comparisons

• Baseline model comparisons
• Foundation model for hysteresis modeling
• Model Zoo - Trained model registry

Experimental Work

Current Experiments

LIST
FROM "02-Areas/A.00 - Hysteresis Modeling/A.00.2 - experiments" 
WHERE !contains(tags, "completed")
SORT file.mtime DESC

Data Processing & Analysis

• Data Pre-Processing - Core preprocessing pipeline
• Adaptive downsampling - Time series compression
• MBI data noise analysis - Signal quality assessment
• Drift-reduction on MBI data - Stability improvements

Datasets 📊

Active Datasets

• Dataset MD 2024-11-29 - Latest MD results
• Dataset BC2024 AWAKE - AWAKE beam studies
• Dipole datasets v9 - Production dataset

Dataset Browser

TABLE status, date, description
FROM "02-Areas/A.00 - Hysteresis Modeling/A.00.4 - Data/Datasets"
WHERE status = "active" OR status = "production"
SORT date DESC

Simulation & Theory

Physics Models

• Preisach model for SPS main magnets - Classical approach
• Jiles-Atherton model for hysteresis - Alternative physics model
• Bouc-Wen model for magnetic hysteresis - PhyLSTM integration

Simulation Tools

• Hysteresis Simulator - Custom simulation package
• Pretraining on field simulations - Synthetic data generation

Operational Deployment

Real-time Systems

• Hysteresis Compensation - Production system overview
• sps-app-hysteresis - Real-time application
• 2024-10-14 - FGC Real-time channel correction - Hardware integration

Performance Monitoring

• Economy modes for hysteresis compensation
• Hysteresis prediction time - Latency analysis

Recent Progress 📈

This Month

LIST
FROM "02-Areas/A.00 - Hysteresis Modeling"
WHERE file.mtime >= date(today) - dur(30 days)
SORT file.mtime DESC
LIMIT 10

Active Models

• TFTMBI-176 - Latest production candidate
• TFTMBI-177 - Backup model
• TFT-6 - Baseline comparison

Machine Dynamics (MDs) 🔬

Recent MDs

• Dedicated MD 2024-11-29 - BPM studies
• Dedicated MD 2024-10-09 - Long LHC cycles
• Parallel MD 2024-11-25 - Perturbation analysis

Planned Studies

LIST
FROM "02-Areas/A.03 - MDs"
WHERE contains(file.name, "2025") AND !contains(tags, "completed")
SORT file.name ASC

Development Tools 🛠️

Core Packages

• transformertf - Neural network framework
• hysteresis-scripts - Analysis utilities
• pyda-nxcals - Data acquisition
• Hysteresis Compensation Utilities - Operational tools

Knowledge Areas

Measurements

• Dipole measurements campaign 2 - Physical validation
• B-Train measurements - Field mapping
• MBI HOLEC measurement limitations - Known constraints

Discoveries & Insights

• Choice of optimizer - Training optimization
• Curriculum Learning - Training strategy
• Quantile loss for hysteresis prediction - Loss function design

Related Work 🔗

• MOC - Magnetic Measurements - Experimental validation
• MOC - Compensation Infrastructure - Operational deployment
• MOC - SPS Operations - Broader accelerator context

Archive 📦

• Archive - Completed experiments and deprecated approaches

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Last updated: 2025-07-29
Next review: Weekly - check active experiments and model performance