Digital low level rf control system with four different intermediate frequencies for the International Linear Collider

Wibowo, Sigit Basuki; Matsumoto, T.; Michizono, Shinichiro; Miura, Takako; Qiu, Feng; Liu, Na

doi:10.1103/physrevaccelbeams.20.093501

Cited by 3 publications

(7 citation statements)

References 1 publication

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“…This equation works well for the fundamental mode (π mode), in which the detuning jΔωj is far less than 1 T s . However, in the case of the parasitic mode of a multicell cavity, in which the values of Δω 8π=9 and 1 T s are comparable, the difference equation in discrete-I described by (9) above may generate problems.…”

Section: A Cavity and Mechanical Modelmentioning

confidence: 99%

“…The cavity differential equation in discrete form is given by (9) and 14, corresponding to discrete-I (for the fundamental mode) and discrete-II (for the parasitic mode), respectively. In the FPGA, ⃗ V c is then calculated by adding the outputs of the discrete-I and discrete-II cases.…”

Section: A Implementation Of Cavity Model In Fpgamentioning

confidence: 99%

“…However, those studies focused mainly on the fundamental mode of the cavity [3][4][5]. At present, multicell cavities are employed in many facilities such as the International Linear Collider (ILC), the compact energy recovery linac (cERL), and the superconducting test facility (STF) [6][7][8][9][10][11][12]. In such setups, the existence of the parasitic modes in the multi-cell cavities limits the loop gain of the LLRF feedback system.…”

Section: Introductionmentioning

confidence: 99%

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Real-time cavity simulator-based low-level radio-frequency test bench and applications for accelerators

Qiu

Michizono

Miura

et al. 2018

Phys. Rev. Accel. Beams

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A Low-level radio-frequency (LLRF) control systems is required to regulate the rf field in the rf cavity used for beam acceleration. As the LLRF system is usually complex, testing of the basic functions or control algorithms of this system in real time and in advance of beam commissioning is strongly recommended. However, the equipment necessary to test the LLRF system, such as superconducting cavities and high-power rf sources, is very expensive; therefore, we have developed a field-programmable gate array (FPGA)-based cavity simulator as a substitute for real rf cavities. Digital models of the cavity and other rf systems are implemented in the FPGA. The main components include cavity baseband models for the fundamental and parasitic modes, a mechanical model of the Lorentz force detuning, and a model of the beam current. Furthermore, in our simulator, the disturbance model used to simulate the power-supply ripples and microphonics is also carefully considered. Based on the presented cavity simulator, we have established an LLRF system test bench that can be applied to different cavity operational conditions. The simulator performance has been verified by comparison with real cavities in KEK accelerators. In this paper, the development and implementation of this cavity simulator is presented first, and the LLRF test bench based on the presented simulator is constructed. The results are then compared with those for KEK accelerators. Finally, several LLRF applications of the cavity simulator are illustrated.

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Section: A Cavity and Mechanical Modelmentioning

confidence: 99%

Section: A Implementation Of Cavity Model In Fpgamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Real-time cavity simulator-based low-level radio-frequency test bench and applications for accelerators

Qiu

Michizono

Miura

et al. 2018

Phys. Rev. Accel. Beams

Self Cite

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“…To reduce the number of boards, we developed a technique using multi IF [23]. With this technique, different IFs are combined by a passive combiner and fed to one ADC.…”

Section: Possible Digital Llrf Control System Configuration For Tmentioning

confidence: 99%

“…One of the concerns in this implementation is the availability of FPGA resources. The multi IF technique was applied in the digital board with four ADCs [23]. It was implemented in the Virtex 5 XC5VFX70T Xilinx FPGA.…”

Section: Possible Digital Llrf Control System Configuration For Tmentioning

confidence: 99%

Digital low level rf control system for the International Linear Collider

Wibowo

Matsumoto

Michizono

et al. 2018

Phys. Rev. Accel. Beams

Self Cite

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The International Linear Collider (ILC) aims to employ field programmable gate array (FPGA)-based digital low level radio frequency (LLRF) control system to achieve its rf stability requirements. In this paper, we present a demonstration and evaluation of the minimal configuration of the digital LLRF control system for the ILC. The achieved stabilities are shown to fulfill the ILC requirements. We also developed signal monitoring capabilities using direct sampling technique and we successfully demonstrate the filling on resonance (FoR) method to reduce the required klystron power. Furthermore, we present the possible configurations of digital LLRF control system for the ILC in this paper. We performed the experiments at Superconducting rf Test Facility (STF) in High Energy Research Organization (KEK), Japan during the cavity conditioning in the autumn of 2016.

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Digital Low Level Radio Frequency System for the Booster Ring of the Taiwan Photon Source

Liu

Chang

et al. 2018

J. Phys.: Conf. Ser.

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Digital low level rf control system with four different intermediate frequencies for the International Linear Collider

Cited by 3 publications

References 1 publication

Real-time cavity simulator-based low-level radio-frequency test bench and applications for accelerators

Real-time cavity simulator-based low-level radio-frequency test bench and applications for accelerators

Digital low level rf control system for the International Linear Collider

Digital Low Level Radio Frequency System for the Booster Ring of the Taiwan Photon Source

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