Analytical Study of the Generation and Control of Orbit Errors in the ANL 4-GeV CW Electron Microtron Design

摘要

The 4-GeV CW Electron Microtron (GEM) Design has 3 linac sections and 3 dispersive straight sections. Six 60 exp 0 sector bending magnets separate the linac and dispersion straight sections. A magnetic optical system has been designed within the dispersive straight sections to contain the beam during the 36 or 37 return passes through the linacs. A major concern is the effect of small alignment or field errors on the equilibrium or desired orbit with a relatively strong focussing system. The results of an analytical study which shows the effect of small random errors on the orbit are presented. A study was also undertaken on the control of the orbit position by making error measurements in one dispersive section and making an angular adjustment with a small dipole in the preceding dispersive section. The analysis indicates that the orbit position can be adequately and easily controlled in the presence of random alignment and field errors. (ERA citation 08:041988)