Speaker
Abstract title
Measurement of the transverse profile of the FCC beams will be challenging due to the high stored beam energy and small beam size. Interceptive monitors such as wire scanners will be limited to use with pilot beams of reduced intensity, and non-invasive diagnostics will be necessary for online beam size measurement. A number of such techniques exist, but their resolution will be pushed to the limit by the small beam sizes of about 100μm for FCC-hh, and as low as 1.2μm in the vertical for FCC-ee.
We present a review of current developments in non-invasive beam profile measurement techniques, with particular emphasis on how they might be applied to the FCC. We discuss synchrotron radiation and the issues caused by the large bending radius of the FCC dipoles; techniques based on the beam-gas interaction (ionisation, fluorescence, vertexing and gas jet scanning); and the laser-wire and electron-beam scanners.