Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source

Ilmoon Hwang; Moohyun Yoon; Eun San Kim; Yeung Jin Han; Jaeseok Yang

doi:10.1109/PAC.2005.1590976

Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source

Ilmoon Hwang^*
, Moohyun Yoon
, Eun San Kim
, Yeung Jin Han
, Jaeseok Yang

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

In the 2.5 GeV Pohang Light Source, we have investigated the suppression of the longitudinal coupled instabilities (CBI) caused by higher order modes (HOMs) of RF cavities. At higher beam current than 170 mA the 758 MHz or 1300 MHz HOMs occurred and the beam could be unstable. The longitudinal CBI could be suppressed by modulating the phase of an RF accelerating voltage at a frequency of 2 times the synchrotron oscillation frequency and by adjusting the water temperatures of the RF cavities. The longitudinal beam oscillations measured by streak camera in synchro-scan mode were shown. The experiment results were compared with the macro particle tracking simulation.

Original language	English
Title of host publication	Proceedings of the Particle Accelerator Conference, PAC 2005
Pages	1970-1972
Number of pages	3
DOIs	https://doi.org/10.1109/PAC.2005.1590976
Publication status	Published - 2005
Externally published	Yes
Event	Particle Accelerator Conference, PAC 2005 - Knoxville, TN, United States Duration: 2005 May 16 → 2005 May 20

Publication series

Name	Proceedings of the IEEE Particle Accelerator Conference
Volume	2005

Conference

Conference	Particle Accelerator Conference, PAC 2005
Country/Territory	United States
City	Knoxville, TN
Period	05/5/16 → 05/5/20

ASJC Scopus subject areas

General Engineering

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10.1109/PAC.2005.1590976

Cite this

Hwang, I., Yoon, M., Kim, E. S., Han, Y. J., & Yang, J. (2005). Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source. In Proceedings of the Particle Accelerator Conference, PAC 2005 (pp. 1970-1972). Article 1590976 (Proceedings of the IEEE Particle Accelerator Conference; Vol. 2005). https://doi.org/10.1109/PAC.2005.1590976

Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source. / Hwang, Ilmoon; Yoon, Moohyun; Kim, Eun San et al.
Proceedings of the Particle Accelerator Conference, PAC 2005. 2005. p. 1970-1972 1590976 (Proceedings of the IEEE Particle Accelerator Conference; Vol. 2005).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Hwang, I, Yoon, M, Kim, ES, Han, YJ & Yang, J 2005, Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source. in Proceedings of the Particle Accelerator Conference, PAC 2005., 1590976, Proceedings of the IEEE Particle Accelerator Conference, vol. 2005, pp. 1970-1972, Particle Accelerator Conference, PAC 2005, Knoxville, TN, United States, 05/5/16. https://doi.org/10.1109/PAC.2005.1590976

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title = "Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source",

abstract = "In the 2.5 GeV Pohang Light Source, we have investigated the suppression of the longitudinal coupled instabilities (CBI) caused by higher order modes (HOMs) of RF cavities. At higher beam current than 170 mA the 758 MHz or 1300 MHz HOMs occurred and the beam could be unstable. The longitudinal CBI could be suppressed by modulating the phase of an RF accelerating voltage at a frequency of 2 times the synchrotron oscillation frequency and by adjusting the water temperatures of the RF cavities. The longitudinal beam oscillations measured by streak camera in synchro-scan mode were shown. The experiment results were compared with the macro particle tracking simulation.",

author = "Ilmoon Hwang and Moohyun Yoon and Kim, \{Eun San\} and Han, \{Yeung Jin\} and Jaeseok Yang",

year = "2005",

doi = "10.1109/PAC.2005.1590976",

language = "English",

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series = "Proceedings of the IEEE Particle Accelerator Conference",

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AU - Yang, Jaeseok

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N2 - In the 2.5 GeV Pohang Light Source, we have investigated the suppression of the longitudinal coupled instabilities (CBI) caused by higher order modes (HOMs) of RF cavities. At higher beam current than 170 mA the 758 MHz or 1300 MHz HOMs occurred and the beam could be unstable. The longitudinal CBI could be suppressed by modulating the phase of an RF accelerating voltage at a frequency of 2 times the synchrotron oscillation frequency and by adjusting the water temperatures of the RF cavities. The longitudinal beam oscillations measured by streak camera in synchro-scan mode were shown. The experiment results were compared with the macro particle tracking simulation.

AB - In the 2.5 GeV Pohang Light Source, we have investigated the suppression of the longitudinal coupled instabilities (CBI) caused by higher order modes (HOMs) of RF cavities. At higher beam current than 170 mA the 758 MHz or 1300 MHz HOMs occurred and the beam could be unstable. The longitudinal CBI could be suppressed by modulating the phase of an RF accelerating voltage at a frequency of 2 times the synchrotron oscillation frequency and by adjusting the water temperatures of the RF cavities. The longitudinal beam oscillations measured by streak camera in synchro-scan mode were shown. The experiment results were compared with the macro particle tracking simulation.

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T3 - Proceedings of the IEEE Particle Accelerator Conference

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BT - Proceedings of the Particle Accelerator Conference, PAC 2005

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Y2 - 16 May 2005 through 20 May 2005

ER -

Suppression of the longitudinal coupled-bunch instabilities by the RF phase modulation in the Pohang Light Source

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