Author/Authors :
Slater، نويسنده , , M. and Adolphsen، نويسنده , , C. and Arnold، نويسنده , , R. and Boogert، نويسنده , , S. and Boorman، نويسنده , , G. and Gournaris، نويسنده , , F. and Hildreth، نويسنده , , M. and Hlaing، نويسنده , , C. and Jackson، نويسنده , , F. and Khainovski، نويسنده , , O. and Kolomensky، نويسنده , , Yu.G. and Lyapin، نويسنده , , A. and Maiheu، نويسنده , , Andrew B. and McCormick، نويسنده , , D. and Miller، نويسنده , , D.J. and Ori، نويسنده ,
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 h for a 1 m long BPM triplet. We find micron-level stability over 1 h 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.
Keywords :
Cavity beam position monitor , BPM , End station A , International linear collider , ESA , iLC , Energy spectrometer , Beam orbit stability
