CALCULATING POINT-CHARGE WAKEFIELDS FROM FINITE LENGTH BUNCH WAKE-POTENTIALS

Conference · Mon Mar 28 04:00:00 EDT 2011

OSTI ID:1016646

Podobedov, B; Stupakov, G

Starting from analytical properties of high frequency geometric impedance we show how one can accurately calculate short bunch wake-potentials (and even point-charge wakefields) from time domain calculations performed with a much longer bunch. In many practical instances this drastically reduces the need for computer resources, speeds up the calculations, and improves their accuracy. To illustrate this method we give examples for 2D accelerator structures of various complexities. We describe preliminary results of a new method that allows us to accurately obtain longitudinal wakefields of short bunches by adding a long-bunch result from an EM solver and a singular analytical wake model. In the future this work will be generalized to 3D geometries as well. Similarly, the method should be equally applicable to the calculations of transverse wakefields. Periodic structures with a significant number of periods (2 {ge} a{sup 2}/{sigma}L, where L is the period length) have not been considered so far. They have asymptotic wakefields that differ from the examples described above. We believe this method is applicable to such geometries as well, as long as correct asymptotic solutions are used.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1016646
• Report Number(s): BNL--94966-2011-CP; 39KC02000
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ACCURACY
ASYMPTOTIC SOLUTIONS
COMPUTERS
IMPEDANCE
POINT CHARGE
bunches
collimator
finite
national synchrotron light source
rms
symptotic
wake
wakefields