Cavity BPM System Tests for the ILC Spectrometer

Abstract

The main physics programme of the International Linear Collider (ILC) requires a measurement of the beam energy at the interaction point with an accuracy of $10^{-4}$ or better. To achieve this goal a magnetic spectrometer using high resolution beam position monitors (BPMs) has been proposed. This paper reports on the cavity BPM system that was deployed to test this proposal. We demonstrate sub-micron resolution and micron level stability over 20 hours for a $1\m$ long BPM triplet. We find micron-level stability over 1 hour for 3 BPM stations distributed over a $30\m$ long baseline. The understanding of the behaviour and response of the BPMs gained from this work has allowed full spectrometer tests to be carried out.

Paper submitted to Nuclear Instruments and Methods. 35 pages, 23 figures

References in corpus (1)

• Observation of Parity Nonconservation in Moller Scattering

Cited by in corpus (8)

• Cavity beam position monitor system for the Accelerator Test Facility 2
• Polarimeters and Energy Spectrometers for the ILC Beam Delivery System
• ILC Beam Energy Measurement by means of Laser Compton Backscattering
• Executive Summary of the Workshop on Polarisation and Beam Energy Measurements at the ILC
• On measurement of the isotropy of the speed of light
• Polarisation and Beam Energy Measurement at a Linear $e^{+}{e}^{-}$ Collider
• Results from a Prototype Chicane-Based Energy Spectrometer for a Linear Collider
• Proposal for Single-Bunch Collimator Wakefield Measurements at SLAC ESTB