The latest generation of IPMs installed in the Fermilab Main Injector and Recycler incorporate a 1 kG permanent magnet, a newly designed high-gain, rad-tolerant preamp, and a control grid to moderate the charge that is allowed to arrive on the anode pick-up strips. The control grid is intended to select a single Booster batch measurement per turn. Initially it is being used to allow for a faster turn-on of a single, high-intensity cycle in either machine. The expectation is that this will extend the Micro Channel Plate lifetime, which is the high-cost consumable in the measurement system. We discuss the new design and data acquired with this system.
@article{arxiv.1502.02703,
title = {Third generation residual gas ionization profile monitors at Fermilab},
author = {J. R. Zagel and M. Alvarez and B. Fellenz and C. Jensen and C. Lundberg and E. McCrory and D. Slimmer and R. Thurman-Keup and D. Tinsley},
journal= {arXiv preprint arXiv:1502.02703},
year = {2015}
}