Beam current monitoring in the AGS booster and its transfer lines

The new AGS Booster is designed to accelerate low intensity polarized protons and heavy ions, and high intensity protons. The authors describe the problems and solutions for the beam current monitors in the booster and its transport lines. The wide range of beam parameters and the vacuum, thermal and radiation environment presented challenges in the instrumentation design. While most of the current monitors are external to the vacuum, they must tolerate bakeout at 150 to 300 degrees C, depending on location. The various types of monitors employed are described. Where available, results of the initial operation are presented.<>