Tevatron Resistive Wall Current Monitor

Abstract

Resistive Wall Current Monitors (RWCM) were designed and built for the Fermilab Tevatron (Tev) project. These devices measure longitudinal beam current from 3 KHz to 6 GHz with 1.34 ohm gap impedance. There are two RWCM's installed a few feet apart in the Tevatron, upstream RWCM is used for general purpose use, downstream RWCM is dedicated for longitudinal parameters of coalesced beam bunches and bunch intensities. The design provides a calibration or test port for injecting test signals. Microwave absorber material is used to reduce interference from spurious electromagnetic waves traveling inside the beam pipe. This paper will do an overview how the RWCM was designed and its test results. KEYWORDS: Instrumentation for particle accelerators and storage rings -high energy (linear accelerators, synchrotrons); Beam-line instrumentation (beam position and profile monitors; beamintensity monitors; bunch length monitors)

Precision measurement of the speed of propagation of neutrinos using the MINOS detectors

“…The time profile of the proton beam is measured using a resistive wall current monitor (RWCM) [20] situated along the beam pipe, which is between the extraction point from the Main Injector [21] and the NuMI target. The RWCM consists of a resistive network bridged across an electrically insulating ceramic break in the stainlesssteel pipe.…”

CLARA conceptual design report

“…Three types of monitors are planned to be used for bunch charge measurement. These will be wall current monitors (WCM) [111], Integrating Current Transformers (ICT) and Faraday Cups (FC) with the FC providing precision and low charge measurements. Four WCMs and ICTs are to be installed after the gun (dark current measurement), after the X-band cavity, and in the low energy and high energy diagnostic sections.…”

The Legacy of the Tevatron in the Area of Accelerator Science

“…electron lenses for beam-beam compensation and hollow electron beam collimation; great advancements in beam physics through the studies of the beam-beam effects, crystal collimation, electron cloud (83) and beam emittance growth mechanisms; new theories of beam optics (84,85), intra-beam scattering and instabilities (86); sophisticated beam-beam and luminosity modeling (87,88); and more efficient beam instrumentation (89,90,91,92,93,94,95,96).…”