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Emittance and beam size distortion due to linear coupling

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1 Author(s)
Parzen, G. ; Brookhaven Nat. Lab., Upton, NY, USA

At injection, the presence of linear coupling may result in an increased beam emittance and in increased beam dimensions. Results for the emittance in the presence of linear coupling will be found. These results for the emittance distortion show that the harmonics of the skew quadrupole field close to νxv+νy are the important harmonics. Results are found for the import driving terms for the emittance distortion. It is shown that if these driving terms are corrected, then the total emittance is unchanged, εxy12. Also, the increase in the beam dimensions is limited to a factor which is less than 1.414. If the correction is good enough, one can achieve ε1x, ε2y, where ε1, ε2 are the emittances in the presence of coupling, and the beam dimensions are unchanged. Global correction of the emittance and beam size distortion appears possible

Published in:

Particle Accelerator Conference, 1993., Proceedings of the 1993

Date of Conference:

17-20 May 1993