Northern Illinois University
Design and Engineering of Modern Beam Diagnostics
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Manfred Wendt, CERN; Silvia Zorzetti and Randy Thurman-Keup, Fermilab
TA: Evan Milton, Fermilab
Purpose and Audience
This graduate-level course gives an introduction to the principles and the engineering of beam instruments and diagnostics systems commonly used in charged particle accelerators. The lectures are accompanied by practical examples and exercises on the computer. The course is intended for graduate students (applied physics, electrical engineering), postdoctoral fellows and other early-career scientists, and accelerator engineers who wish to enter this broad, exciting field of beam instrumentation and diagnostics. The course is mostly engineering-oriented, but also reviews the underlying physics of diagnostic systems covered. A complementary first-week course on "Beam Based Diagnostics" covers the use of these devices in measuring and manipulating many physics parameters of the beam.
A senior undergraduate level understanding of electromagnetic fields and waves, fundamentals of electronic circuits, and some familiarity with basic accelerator physics at the level of the USPAS course “Fundamentals of Accelerator Physics and Technology.”
It is the responsibility of the student to ensure that they meet the course prerequisites or have equivalent experience.
Modern beam instrumentation and diagnostics cover a wide range of engineering and applied physics principles, and are used in every linear or circular particle accelerator. Improving performance, accuracy and resolution of the beam instruments which analyze and characterize the beam is the best, direct way to improve the accelerator performance, its reliability, and the beam quality. This course discusses a variety of beam monitors, from well-known electromagnetic beam monitors such as beam current and beam position monitors, intercepting and non-intercepting profile monitors including those based on optical radiation principles (e.g. scintillation, synchrotron and transition radiation, etc.) to some state-of-the-art or less known beam instruments, e.g. the cryogenic-current-comparator, cavity beam position monitors, Schottky signal observation, etc. While not all types of beam instruments can be covered, additional primers in relevant engineering disciplines, e.g. RF engineering and analog electronics, digital signal processing, optical design, will be overviewed. Students successfully completing this course will be prepared to complete conceptual engineering designs of a broad range of common beam diagnostic systems.
The course will consist of approximately 15 lectures, most of them during morning sessions. In addition, there will be computer exercises every afternoon demonstrating many concepts presented in the lectures, as well as introducing software tools to analyze and optimize electromagnetic beam monitors, RF and analog signal conditioning electronics, digital signal processing systems, and optical designs. The afternoons may also include some of the lectures, plus some less formal discussion sessions and tutorials. Regular homework assignments will be assigned that will be completed outside of class.
The course will start with a brief refresher on math and electromagnetics, followed by definitions of beam and machine parameters to be measured. A variety of beam monitors and their principles will be discussed, image current principle, wall current monitors and toroids, DC-current transformers, broad-band beam position monitors (button, strip-line, split-plate), resonant cavity BPMs, Schottky signals and their monitoring, synchrotron light monitors, monitors based on transition radiation or scintillation, ionization profile monitors, etc. The lectures will also include notes on the extraction of wanted beam parameters, analog signal conditioning, digital signal processing, calibration methods (signal and beam-based), etc. A short discussion on wake fields and impedances and a primer on RF engineering will also be included.
"Beam Position Monitoring" by Robert Shafer
"A Brief Introduction to Beam Position Monitors for Charges Particle Accelerators" by Manfred Wendt https://ieeexplore.ieee.org/document/9620043
"Tutorial on Beam Current Monitoring" by Robert C. Webber, FERMILAB-Conf-00-119, June 2000
"Radiation Sources and their Application for Beam Profile Diagnostics", by Gero Kube
This, and additional material will be provided by the instructors.
Student grades will be evaluated based on performance as follows: final exam (50%), homework assignments (20%), class participation (20%), computer exercises (10%).
USPAS Computer Requirements
There will be no Computer Lab and all participants are required to bring their own portable computer to access online course notes and computer resources. This can be a laptop or a tablet with a sufficiently large screen and keyboard. Windows, Mac, and Linux-based systems that are wifi capable and have a standard web browser and mouse are all acceptable. You should have privileges for software installs. If you are unable to bring a computer, please contact firstname.lastname@example.org ASAP to request a laptop loan. Very limited IT support and spare loaner laptops will be available during the session.
Northern Illinois University course number: PHYS 790D Special Topics in Physics - Beam Physics
Indiana University course number: Physics 671, "Advanced Topics in Accelerator Physics"
Michigan State University course number: PHY 963, "U.S. Particle Accelerator School"
MIT course number: 8.790, "Accelerator Physics"