Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

XU Wei; LI Jing-Yi; HUANG Sen-Lin

doi:10.1088/1674-1137/38/10/107003

Chinese Physics C> 2014, Vol. 38> Issue(10) : 107003 DOI: 10.1088/1674-1137/38/10/107003

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

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The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers (FELs), and the High Intensity Gamma-ray Source (HIGS). It is operated with a beam current ranging from about 1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors (BPMs) are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations.

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XU Wei, LI Jing-Yi and HUANG Sen-Lin. Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current[J]. Chinese Physics C, 2014, 38(10): 107003. doi: 10.1088/1674-1137/38/10/107003

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Received: 2013-11-20
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

Corresponding author: XU Wei,

Corresponding author: LI Jing-Yi,

Received Date: 2013-11-20
Accepted Date: 1900-01-01
Available Online: 2014-10-05

Abstract: The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers (FELs), and the High Intensity Gamma-ray Source (HIGS). It is operated with a beam current ranging from about 1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the FEL and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors (BPMs) are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable FEL and HIGS operations.