Development of Rapid Techniques for Improving Orbit Correction for SOLEIL II

Situated at the heart of the Paris-Saclay cluster, approximately 20 km from Paris, SOLEIL is the French national synchrotron radiation source. In this large research infrastructure, the scientific experiments exploit the light from synchrotron radiation from the infrared to hard X-rays. Since 2008, SOLEIL has been serving many research fields in physics, biology and chemistry with applications in Materials Science, Structural Biology, Pharmaceuticals, Environmental & Earth Sciences and Cultural Heritage. SOLEIL, overseen by the CNRS and the CEA, provides its personnel with a multidisciplinary and internationally renowned working environment.

Objective

The primary goal of this internship is to explore and develop new algorithms for rapid measurement and correction techniques, essential for the SOLEIL upgrade, focusing on improving fast orbit correction which is fundamental for SOLEIL II.

Project Description SOLEIL

Synchrotron is undergoing a major upgrade (SOLEIL II), and the improvement of fast orbit correction techniques is crucial for optimizing accelerator performance. This internship aims to develop and implement new rapid measurement techniques based on beam measurements, leveraging the new fast orbit feedback architecture and versatile power supplies planned for the upgrade. The focus will be on the following techniques:

• AC-LOCO (Alternating Current Linear Optics from Closed Orbits): A technique that uses sine-wave beam excitation via fast correctors to improve precision and reduce measurement time compared to traditional LOCO methods. AC-LOCO allows for effective noise suppression and simultaneous excitation of multiple correctors at different frequencies.

• LOCOM (Linear Optics from Closed Orbit Modulation): An improvement on AC-LOCO that uses orbit modulation and feature extraction to process a high number of orbits within a second, further reducing measurement and processing time.

• AC-BBA (Alternating Current Beam-Based Alignment): A method that applies AC excitation principles to beam-based alignment procedures, potentially offering faster and more precise alignment of magnets and beam position monitors. The intern will work on implementing and optimizing these techniques for SOLEIL II, aiming to achieve faster, more precise orbit corrections and improved overall beam stability.

Key Tasks

1. Study and implement new techniques based on beam measurements, including AC-LOCO, LOCOM, and AC-BBA.

2. Explore the new fast orbit feedback architecture, particularly rapid data flows and synchronization.

3. Document the process, challenges, and solutions encountered during the development.

4. Prepare a report and presentation on the findings and recommendations for implementing these techniques at SOLEIL. 

Required Skills

• Proficiency in programming (Python, C++, Matlab, or equivalent)

• Basic knowledge of accelerator physics (preferred) • Strong analytical and problem-solving skills

• Good documentation and communication skills

• Technical English

Expected Outcomes

• Implementation of new rapid measurement techniques (AC-LOCO, LOCOM, AC-BBA)

• Algorithms for fast orbit correction using the new feedback architecture

• Documentation on the developed techniques and their implementation Duration 6 months Benefits for the Student This internship will provide the student with valuable experience in advanced accelerator physics techniques, algorithms development. The student will gain practical and usefull skills in rapid measurement techniques, data analysis, and accelerator correction orbits, contributing significantly to SOLEIL’s upgrade project.