CERN Accelerating science

Internal Note
Report number	CERN-ACC-NOTE-2021-0010 ; Fermilab-FN-1119-AD
Title	Nonlinear optics measurements in IOTA
Abbreviation	IOTA, Integrable Optics Test Accelerator
Author(s)	Hofer, Michael (CERN) ; Tomas Garcia, Rogelio (CERN) ; Stancari, Giulio (Fermi National Accelerator Lab. (US)) ; Romanov, Aleksandr (Fermi National Accelerator Lab. (US)) ; Kuklev, Nikita (The University of Chicago) ; Szustkowski, Sebastian (Northern Illinois University (US)) ; Valishev, Alexander (Fermi National Accelerator Lab. (US))
Corporate author(s)	CERN. Geneva. ATS Department
Publication	2021
Imprint	15 Mar 2021
Number of pages	34
Subject category	Accelerators and Storage Rings
Keywords	IOTA, Integrable Optics Test Accelerator ; Integrable Optics Test Accelerator
Abstract	Nonlinear integrable optics is a recently proposed accelerator lattice design approach which allows to generate an amplitude dependent tune shift which is needed in high brightness accelerators to mitigate fast coherent instabilities. Whereas usually octupoles are used to achieve this task, this concept allows doing so without exciting any resonances, in turn preventing any particle loss. The concept is based around a special magnet design, together with specific constraints on the optics of the accelerator. To study such a system, the Integrable Optics Test Accelerator (IOTA) was recently constructed and commissioned at Fermilab. For the assessment of the performance of this concept, good knowledge of the optics and the (non-)linear dynamics without the special magnet is of key importance. As such, measurements were conducted in the IOTA ring, using the captured turn-by-turn data by the beam position monitors after excitation to infer quantities such as amplitude detuning and resonance driving terms. In this note, first results of these measurements are presented.
Other source	Inspire
Submitted by	[email protected]