FONT stripline BPM resolution

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FONT stripline BPM resolution N. Blaskovic, R. Bodenstein, T. Bromwich, P. Burrows, G. Christian, C. Perry, R. Ramjiawan John Adams Institute, Oxford University N. Blaskovic ATF Meeting

Stripline BPM system 3 stripline BPMs P1, P2 & P3 in EXT line Previous resolution 291 ± 10 nm at charge of 0.5 x 1010 (PRST-AB 18, 032803, 2015) based on figure from G. White et al. (PRL, 2014) N. Blaskovic ATF Meeting

Stripline BPM system upgrades Upgraded phase shifter (finer setting) Installed 6 dB attenuator in processor (double maximum operating charge: 1010) Introduced FONT5A board clock filtering stripline BPM phase shifter processor FONT5A board hybrids mixers attenuator Φ + 6dB  –  N. Blaskovic ATF Meeting

latest results 213 nm at ~0.5 x 1010 157 nm at ~0.8 x 1010 N. Blaskovic ATF Meeting

Conclusion Stripline BPM system hardware upgraded for improved resolution and higher charge Best resolution: ~150 nm at 0.8 x 1010 Thanks to Glen White and the rest of the ATF team for stable high-charge beam! N. Blaskovic ATF Meeting

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