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- P. Burrows
Queen Mary University of London, London
- G.B. Christian, H. Dabiri Khah, A.F. Hartin, G.R. White
JAI, Oxford
- C.C. Clarke, C. Perry
OXFORDphysics, Oxford, Oxon
- A. Kalinin
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- D.J. McCormick, S. Molloy, M.C. Ross
SLAC, Menlo Park, California
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We report on the design and initial testing of the 4th generation Feedback on Nanosecond Timescales (FONT) prototype intra-train beam-based feedback system for beam control and luminosity optimisation at the International Linear Collider (ILC). FONT4 comprises a fast-analogue front-end BPM signal processor, with an FPGA-based digital feedback processor and a fast-risetime kicker-driver amplifier. The system is being designed with a total latency budget (including signal propagation delays) of about 140ns. FONT4 will be deployed at the Accelerator Test Facility (ATF) at KEK, where it will be tested with the electron bunchtrain extracted from the ATF damping ring. The bunches will have a spacing of c. 150ns, chosen to match the ILC design. We report the results of initial beam tests of the system components. We aim to demonstrate feedback, with delay-loop operation, on this ILC-like bunchtrain.
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