U.S. Particle Accelerator School

CESR Beam Measurements and Diagnostics course

Sponsoring University:

Cornell University


CESR Beam Measurements and Diagnostics


David L. Rubin, Cornell University

Purpose and Audience
The purpose of this course is to introduce students to beam-based measurement and diagnostics. Students will measure properties of accelerating beams in the Wilson Synchrotron and stored beams in the 5.3 GeV Cornell Electron Storage Ring (CESR). Students will learn to use the CESR control system and instrumentation to perform a series of experiments. This course is suitable for students familiar with the basic concepts of beam optics and dynamics, including betatron tune, closed orbits, beta-functions, chromaticity, coupling, and phase space.

The objective of the course is to give students an introduction to accelerator control systems, the practical use of beam monitoring instrumentation, and beam-based measurement techniques. Measurements will be motivated and supported by accelerator theory, and model-based calculations.

Instructional Method
We will begin with an introduction to the CESR control system and the instrumentation and software that is used to manipulate the guide field magnets and make beam measurements. Over the course of the week, each student will perform 4-5 machine experiments and then complete analysis of the measured data. CESR accelerator staff will act in a supporting role, to offer suggestions and guidance and to answer questions. The experimental plan will be prepared off-line in consultation with the instructor, and follow up analysis will be completed using software and modeling tools that have been developed by the CESR accelerator group. Students will spend the morning (afternoon) in planning or analysis, and the afternoon (morning) in the CESR control room making measurements.

Course Content
Experiments will include: creation and measurement of closed orbit bumps and closed beta-bumps, characterization of transverse coupling, measurement of loss parameter, measurement of multibunch instability thresholds, grow-damp measurement of multi-bunch stability, resonance scans, phase space mapping, etc..

Reading Requirements
Control system documentation (i.e. CESRV). Available on-line at Cornell University.

Credit Requirements
Students will be evaluated based on performance as follows: machine study plans (30 % of final grade), control room sessions (40% of final grade), analysis of measurements ( 30% of final grade).