Summary of Schottky MD 2408 Jan 18 2018

Summary of Schottky MD 2408 Jan 18 2018, LSWG D. Alves, T. Levens, T. Tydecks, M. Wendt, J. Wenninger

Schottky MD 2408 – Overview and Goals • • Test Schottky monitors for usability to accurately determine beam chromaticities in parasitical / non-intrusive manner Compare chromaticity determination methods: Fitting VS Threshold method 2/6/2022 T. Tydecks, MD 2408, LSWG 1

Chromaticity • • No severe difference between threshold / fitting method Agreement with set chromaticity differs for beams / planes -> B 2 V appears to be closest to set chromaticity 2/6/2022 T. Tydecks, MD 2408, LSWG 2

Effect of Octupole on Coherent Lines • • • The effect of excited octupoles on coherent lines was studied With octupoles, coherent lines disappear from spectrum This could be interesting for improved chromaticity measurement … to be continued 2/6/2022 T. Tydecks, MD 2408, LSWG 3

Emittance (1) • • Emittance proportional to area of humps => relative change can be extracted Using blow up at flat bottom: change observed, but not as high as expected (factor 1. 2 VS 2. 0) 2/6/2022 T. Tydecks, MD 2408, LSWG 4

Emittance (2) • • • Emittance proportional to area of humps => relative change can be extracted Using blow up at flat bottom: change observed, but not as high as expected (factor 1. 2 VS 2. 0) Emittance evolution on energy ramp: change for B 2 V in right ballpark: expected 0. 07, measured 0. 04 2/6/2022 T. Tydecks, MD 2408, LSWG 5

Summary / Outlook • • • Chromaticity has been measured using Schottky monitors at flat bottom Depending on the monitor, reliable values are determined within +-1 unit of set value; there is room for improvement of remaining monitors / planes, which shall be done during start up Emittance extraction from Schottky signals looks promising but needs further investigation 2/6/2022 T. Tydecks, MD 2408, LSWG 6

Thanks for your attention 2/6/2022 T. Tydecks, MD 2408, LSWG 7