IPAC'24 - 15th International Particle Accelerator Conference

Comparison of simulation and measurement of an in-vacuum undulator coupling impedance at NSLS-II

THPC46

23 May 2024, 16:00

2h

Country (MCC Exhibit Hall A)

Poster Presentation MC5.D04 Beam Coupling Impedance Theory, Simulations, Measurements, Code Development Thursday Poster Session

Speaker

Aamna Khan (Brookhaven National Laboratory)

Description

The impedance of in-vacuum undulators (IVU) is a significant part of the total broadband impedance determining collective effects of beam dynamics in synchrotrons. It is computationally difficult to simulate the full few-meter-long 3D structure, which includes bellows, flanges, and taper transitions with a variable gap. So, the impedance is usually calculated separately for a simplified geometry of every component and the resistive-wall impedance is calculated using analytical formulas. The ECHO3D code based on a low-dispersive numerical technique provides an opportunity to compute the wakefield induced by a very short bunch in the full 3D model of the NSLS-II IVU. Here, we discuss the numerical simulations in comparison with beam-based measurements.