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.
@article{arxiv.0712.1350,
title = {Cavity BPM System Tests for the ILC Spectrometer},
author = {M. Slater and C. Adolphsen and R. Arnold and S. Boogert and G. Boorman and F. Gournaris and M. Hildreth and C. Hlaing and F. Jackson and O. Khainovski and Yu. G. Kolomensky and A. Lyapin and B. Maiheu and D. McCormick and D. J. Miller and T. J. Orimoto and Z. Szalata and M. Thomson and D. Ward and M. Wing and M. Woods},
journal= {arXiv preprint arXiv:0712.1350},
year = {2009}
}
Comments
Paper submitted to Nuclear Instruments and Methods. 35 pages, 23 figures