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@unpublished{li:sap2023-mopb025,
% --- JACoW template Dec 2024 ---
author = {J.T. Li},
title = {{Damping Trapped Modes in Vacuum Chamber of Heps in-Air Undulators}},
eventtitle = {14th Symp. Accel. Phys. (SAP'23)},
eventdate = {2023-07-10/2023-07-12},
language = {english},
intype = {presented at},
series = {Symposium on Accelerator Physics},
number = {14},
venue = {Xichang, China},
note = {presented at the 14th Symp. Accel. Phys. (SAP'23) in Xichang, China, unpublished},
abstract = {{The HEPS is the fourth-generation light source under construction. For the requirements for high-brightness, a large number of in-air undulators with small gaps will be installed in the storage ring and become one of the important impedance contributors. Photon absorbers will be commonly used in the vacuum chamber of the in-air undulators to shielding the vacuum components downstream which are sensitive to the synchrotron radiations. Due to the existence of photon absorbers, some trapped modes in the transverse planes will be excited by the beam passage. In this paper, a series of numerical simulations are performed to investigate the detailed properties of the trapped modes. In addition, according to electromagnetic field distribution of the trapped modes, damping strategies are investigated to mitigate their influence to the beam instabilities.}},
}