Beam impedance and heating analysis of the diagnostic stripline

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 963; no. C; p. 163729
• Main Authors: Blednykh, A., Bacha, B., Bassi, G., Hetzel, C., Kosciuk, B., Padrazo, D., Shaftan, T., Smaluk, V., Ha, T.
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 21.05.2020; Elsevier
• Subjects: Characteristic impedance; Longitudinal coupling impedance; Loss factor; PARTICLE ACCELERATORS; Power loss; Stripline; Temperature; Power loss; Loss factor; Temperature; Longitudinal coupling impedance; Stripline; Characteristic impedance
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2020.163729

The heat transfer analysis has been performed for the stripline kicker, design of which is used at many accelerator facilities as a part of the transverse bunch-by-bunch feed-back system, including NSLS-II. The experimental data of the electrode temperature have been collected from a special diagnostic stripline designed with six infrared view ports. The temperature analysis is based on the power loss calculations and the loss factor computed by the 3-D electromagnetic simulation code GdfidL. To estimate the power loss, we analyze the real part of the longitudinal impedance and the loss factor for two different regimes. We use the ANSYS finite element code to correlate the temperature with the power loss. Lambertson and Shafer formalisms of the longitudinal and transverse beam impedances are discussed for the simplified stripline geometries. The required characteristic impedances and the geometric factors are determined analytically for the simplified geometries and compared with the results for the designed stripline geometry using the 2-D POISSON code by solving the Laplace’s equation in two dimensions. Lambertson’s equations are compared with numerical results. We introduce the frequency range, within which we can apply the analytical approach.