Title :
Design and preliminary tests of a beam intensity monitor for LEP
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
The beam intensity monitor for the circulating beams in the CERN LEP (Large Electron-Positron) collider uses toroidal cores of an amorphous magnetic alloy as sensors. It consists of two independent systems. The first system is a current transformer employing a parametric amplifying principle to measure the sum of the currents of both beams (DC component). This system has a resolution better than 0.2 μA and gives the absolute calibration of the monitor. The second system is a passive integrating current transformer to measure the relative charge of each individual bunch. Synchronous analog signal processing corrects for baseline offsets and tracks a selected bunch over many revolutions. This makes it possible to measure the number of circulating particles with great precision and for each bunch separately
Keywords :
calibration; current transformers; particle beam diagnostics; LEP; beam intensity monitor; calibration; current transformer; parametric amplifying; passive integrating current transformer; resolution; synchronous analog signal processing; Amorphous magnetic materials; Amorphous materials; Colliding beam devices; Current measurement; Current transformers; Magnetic cores; Magnetic separation; Monitoring; Testing; Transformer cores;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73158
