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@inproceedings{zhang:ipac2021-mopab295,
author = {H.D. Zhang and C.P. Welsch},
title = {{Simulation Study of Emittance Measurement Using a Genetic Algorithm for Space Charge Dominated Beams}},
booktitle = {Proc. IPAC'21},
pages = {935--938},
eid = {MOPAB295},
language = {english},
keywords = {emittance, quadrupole, space-charge, simulation, lattice},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-MOPAB295},
url = {https://jacow.org/ipac2021/papers/mopab295.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB295},
abstract = {{The quadrupole scan method is one of the traditional ways to measure beam emittance in an accelerator. The required devices are simple: several quadrupole magnets and a beam profile monitor. Beam sizes are measured from the beam profile monitor with different quadrupole settings to bring the beam through its waist and then fitted to a quadratic equation to determine the Twiss parameters. measured data from a quadrupole scan taking the beam through its waist is fitted to a quadratic equation and this allows determining the Twiss parameters. However, with increasing beam intensity, the transfer function becomes non-linear and this causes a deviation of the fitted emittance from its real value, making it no longer useful. In this contribution, a genetic algorithm is applied to find the optimum quadrupole scan fit in space-charge dominated electron beams. Results from simulations using different space charge levels are presented and scenarios identified where this method can be applied.}},
}