Development of Measurement and Transverse Feedback System at HLS

Wang, J.H.; Liu, J.H.; Zheng, Kan; Li, W.M.; Liu, Z.P.; Sun, Biao; He, Duohui; Yang, Yongliang; Zhou, Zhengrong

doi:10.1109/pac.2005.1591332

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…After that, a consecutive data segment containing 20 position signals for each bunch (e.g., for the first bunch, B1_0, …B1_19) are extracted by using shift registers (I_SHIFT). Then the outputs of the shift registers are split into two paths, of which one is fed to the FIR filter [13][14][15][16] for feedback information calculation in X direction, and the other is used for the calculation in the Y direction. The 20-order filter is used to process the digitized bunch signal and calculate the feedback data with a correct phase shift, meanwhile rejecting the DC component caused by the equilibrium orbit [17].…”

Section: Design Of Fpga-based Signal Process Algorithmmentioning

confidence: 99%

Design and testing of a bunch-by-bunch beam position transverse feedback processor

Zhan

Liu

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Shanghai Synchrotron Radiation Facility (SSRF) is a 3.5 GeV storage ring with a bunch rate of 499.654 MHz, harmonic number of 720, and circumference of 432 meters. SSRF injection works at 3.5 GeV, where the multi-bunch instabilities limit the maximum stored current. In order to suppress multi-bunch instabilities caused by transverse impedance, a bunch-by-bunch transverse feedback system is indispensable for SSRF. The key component of that system is the bunch-by-bunch transverse feedback electronics. An important task in the electronics is precise time synchronization. In this paper, a novel clock synchronization and precise delay adjustment method based on the PLLs and delay lines are proposed. Test results indicate that the ENOB (Effective Number Of Bits) of the analog-to-digital conversion circuit is better than 9 bits in the input signal frequency range from 100 kHz to 700 MHz, and the closed loop attenuation at the critical frequency points is better than 40 dB. The initial commissioning tests with the beam in SSRF are also conducted, and the results are consistent with the expectations.Index Terms: beam feedback, bunch-by-bunch transverse feedback, clock synchronization, precise delay adjustment

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Section: Design Of Fpga-based Signal Process Algorithmmentioning

confidence: 99%

Design and testing of a bunch-by-bunch beam position transverse feedback processor

Zhan

Liu

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…The HLS BxB system consists of two projects: the BxB measurement system [1] [2] and the BxB transverse analogy feedback system[2] [3]. Signal detection have implemented by Beam Position Monitor (BPM), which has four-button type pick-ups mounted in a skew 45 o [4], and feedback devices is using strip lines.…”

Section: Hls Bunch-by-bunch Systemmentioning

confidence: 99%

Development of transverse feedback system and instabilities suppress at HLS

Wang¹,

Zheng²,

Li³

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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In order to cure and damp coupled bunch instabilities (CBI), a bunch-by-bunch (BxB) measurement and transverse feedback system is under commission at Hefei Light Source (HLS). In this paper we introduce the overview of the measurement and analogy transverse BxB feedback system in emphases. The measurement system is dedicated to observe the beam instability and works as a part of the analogy and digital transverse BxB feedback system. The development of several characterized components and stripline feedback kicker as well as the experiment result of the feedback system in HLS ring is also presented in this paper.

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“…A 12 bit 500 Msps ADC chip AD9434 is employed in this design. The output of the ADC are then fed to a Field Programmable Gate Array (FPGA) to calculate the feedback coefficients based on Finite Impulse Response (FIR) filters in [7][8][9][10]. These coefficients are used as the input of two 14 bit DAC (AD9736 from Analog Device Inc.) working at 500 MHz, which are used for transverse feedback in the vertical and horizontal (i.e.…”

Section: Introductionmentioning

confidence: 99%

Bunch-by-Bunch Beam Transverse Feedback Electronics Designed for SSRF

Liu

Zhao

Zhan

et al. 2017

IEEE Trans. Nucl. Sci.

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Shanghai Synchrotron Radiation Facility (SSRF), is one of the third-generation high-beam current (3.5 GeV) synchrotron light sources. In the storage ring of SSRF, multi-bunch instabilities would increase beam emittance and energy spread, which degrade beam quality and even cause beam loss. To address the above issues, a Transverse Feedback System is indispensable for SSRF, in which the key component is the bunch-by-bunch transverse feedback electronics. The whole feedback system consists of five main parts: Beam Position Monitor (BPM), RF front-end, signal processor, RF amplifier, and vertical/horizontal transverse kickers. The dissertation focuses on the signal processor we design, which is the main part of the feedback electronics. We conducted initial testing on the signal processor to evaluate its performance and function. Test results indicate that ENOB of the Analog-to-Digital Conversion circuit is better than 10 bit with 100 MHz input signal, and remains better than 9.5 bit up to 300 MHz, which is good enough for the required 7.9 bit; the frequency response of the whole system also concords well with the simulation results, and the suppression in amplitude response at the critical frequency points is better 35 dB while the uncertainty of phase response is better than 2º, all meeting the application requirement. Index Terms-SSRF, transverse feedback, bunch-by-bunch feedbackManuscript

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Development of Measurement and Transverse Feedback System at HLS

Cited by 3 publications

References 3 publications

Design and testing of a bunch-by-bunch beam position transverse feedback processor

Design and testing of a bunch-by-bunch beam position transverse feedback processor

Development of transverse feedback system and instabilities suppress at HLS

Bunch-by-Bunch Beam Transverse Feedback Electronics Designed for SSRF

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