U.S. Particle Accelerator School

Advanced Beam Dynamics course

Sponsoring University:

University of California, Berkeley

Course:

Advanced Beam Dynamics

Instructors:

Bruce Carlsten and Steve Russell, LANL


Purpose and Audience
Modern accelerator systems rely heavily on the ability of generating and preserving electron beams with extreme characteristics. In this graduate course, the students will be introduced to the physics and technology of generating high-performance electron beams and the preservation of such beams through long and complicated beam transport lines.

Prerequisites
Electromagnetism and Classical Mechanics.

Objectives
The goal of this course is to give the students a thorough introduction into the physics of high performance electron beam dynamics. Upon completion of the course, the student is expected to be able to read and understand current literature on photoinjectors, bunchers, and beam optics, and to be able to design high-brightness, low-emittance photoinjectors and bunchers.

Instructional Method
The course will consist of 25 hours of lectures during the morning and early afternoon, focusing on the theoretical understanding of the course content elements, and will be complemented by afternoon 2-hour sessions in the computer lab in which students will have an opportunity to design their own low-emittance rf photoinjector and bunch compression system. The time in the computer lab will be used to give the students hands-on experience with designing their own low-emittance photoinjector and bunch compression system, with the ultimate goal of producing a design for a 100-MeV beam with a bunch charge of 1 nC, normalized emittance of 1 mm mrad, and bunch length of 1 ps. The matrix code TRACE will be used to design the bunch compressor and the particle-pushing code PARMELA will be used to design the rf photoinjector and verify the compressor's performance. Daily homework will be given, that lets the student review basic concepts introduced in class.

Course Content
This course will focus on the physics of beam emittance and emittance growth mechanisms in high brightness electron linacs. Most of the course material will be directed toward effects present in rf photoinjector-driven accelerators, but some material will also be used to highlight common beam behavior with other types of electron accelerators, including induction linacs. Topics we will study will include space-charge effects, transverse plasma oscillations in beams, emittance oscillations, wavebreaking and other thermalization mechanisms, bunch compression, coherent-synchrotron radiation and related mechanisms, and emittance cooling and conversion schemes. We will also study some common diagnostics used for measuring beam parameters.

Reading Requirements
Instructor-provided handouts.

Credit Requirements
Students will be evaluated based on performance: homework 30% of final grade, final exam 30% of final grade, and computer lab project 40% of final grade.