Cavity BPM System Tests for the ILC Spectrometer

Details Cavity BPM System Tests for the ILC Spectrometer Cavity BPM System Tests for the ILC Spectrometer

2007-12-09

arxiv.org/abs/0712.1350v1

Physics

Instrumentation and Detectors

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

Scientific paper

10.1016/j.nima.2008.04.033

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.

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