Microwave Schottky diagnostic systems for the Fermilab Tevatron, Recycler, and CERN LHC

TL;DR

This paper presents a non-invasive, high-bandwidth Schottky diagnostic system for measuring transverse and longitudinal beam parameters in large synchrotrons like Fermilab and CERN, enabling detailed bunch-by-bunch analysis.

Contribution

It introduces a novel high-sensitivity slotted waveguide pickup system capable of wide bandwidth measurements for beam diagnostics in major accelerators.

Findings

Successfully installed and commissioned in Fermilab Tevatron, Recycler, and CERN LHC.

Capable of measuring tune, chromaticity, and momentum spread for multiple beam bunches.

Allows emittance measurement through analysis of incoherent tune sidebands.

Abstract

A means for non-invasive measurement of transverse and longitudinal characteristics of bunched beams in synchrotrons has been developed based on high sensitivity slotted waveguide pickups. The pickups allow for bandwidths exceeding hundreds of MHz while maintaining good beam sensitivity characteristics. Wide bandwidth is essential to allow bunch-by-bunch measurements by means of a fast gate. The Schottky detector system is installed and successfully commissioned in the Fermilab Tevatron, Recycler and CERN LHC synchrotrons. Measurement capabilities include tune, chromaticity, and momentum spread of single or multiple beam bunches in any combination. With appropriate calibrations, emittance can also be measured by integrating the area under the incoherent tune sidebands.