Fu-Yu Chang
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View article: Status and upgrades of radio frequency system at Taiwan Photon Source
Status and upgrades of radio frequency system at Taiwan Photon Source Open
In order to meet the upcoming RF power requirements of TPS, a five-year upgrade project to construct a new RF station was completed in early 2022. This new RF station mainly consists of an SRF module, a 300-kW SSPA, an analog LLRF control …
View article: Adaptive Control of Klystron Operation Parameters for Energy Saving at Storage Ring of TPS
Adaptive Control of Klystron Operation Parameters for Energy Saving at Storage Ring of TPS Open
To satisfy maximum beam current operation in the storage ring of TPS, the operation parameters of both RF transmitters are set to be able to generate its maxi-mum RF power in daily usage. Under such condition, the klystrons can deliver any…
View article: A Klystron Phase Lock Loop for RF System at TPS Booster Ring
A Klystron Phase Lock Loop for RF System at TPS Booster Ring Open
In TPS booster ring, the DLLRF is used to controlled the ramping gap voltage and also the energy saving module is applied to save power while the ring does not inject beam. But we occurred to have a problem of PI saturation due to a large …
View article: The Progress of 300 kW Home-Made Fully Solid-State Transmitter for TPS
The Progress of 300 kW Home-Made Fully Solid-State Transmitter for TPS Open
To support the stable operation of Taiwan Photon Source (TPS) with 500mA beam current and the in-creasing beam line construction, a 3rd RF plant is thus constructed for such demand. The RF power source of the other 2 RF plants adopts klyst…
View article: The commission of the home-made 500MHz, 80kW solid-state amplifier in NSRRC
The commission of the home-made 500MHz, 80kW solid-state amplifier in NSRRC Open
Solid-state for high power RF application is an attracting and interesting technology which is now become popular in accelerator field. To adopt and master such technique, a 500MHz, 80kW solid-state amplifier is thus developed in NSRRC. Th…
View article: RF Data Acquisition and Soft Alarm System for the Taiwan Photon Source
RF Data Acquisition and Soft Alarm System for the Taiwan Photon Source Open
The Taiwan Photon Source (TPS) is a modern, high brightness 3 GeV light source. A data acquisition program for the radio frequency (RF) system, including a transient data recorder, a long term data archiver and real time data monitoring, h…
View article: Upgrade of the Cryogenic Control System for SRF Modules at the Taiwan Light Source
Upgrade of the Cryogenic Control System for SRF Modules at the Taiwan Light Source Open
An upgrade of the cryogenic control system for superconducting radio-frequency (SRF) modules of the Taiwan Light Source (TLS) has been completed. The biggest challenge was to recover all protection and operational functions, while minimizi…
View article: Performance Tests of a Digital Low-Level Rf-System at the TPS
Performance Tests of a Digital Low-Level Rf-System at the TPS Open
A digital low-level RF (DLLRF) control system for the cavity gap voltage is now common throughout the world. At the Taiwan Photon Source (TPS) we installed and operated a DLLRF in the booster ring in 2018 successfully and plan to install i…
View article: An Approach to Alleviating Heavy Beam Loading Effect on the Synchrotron Machine Through the Existed Low Level RF Feedback System
An Approach to Alleviating Heavy Beam Loading Effect on the Synchrotron Machine Through the Existed Low Level RF Feedback System Open
To pursue the highest brightness and intensity of the synchrotron light, the synchrotron machines are pushed to operate with as high as possible of the beam current. To suppress the heavy beam loading effects, the direct RF feedback is cur…
View article: Study of the System Stability for the Digital Low Level RF System Operated at High Beam Currents
Study of the System Stability for the Digital Low Level RF System Operated at High Beam Currents Open
The purpose of a Low-Level Radio Frequency (LLRF) system is to control the amplitude and phase of the field in the accelerating cavity. A digital LLRF (DLLRF) system will be installed in the Taiwan Photon Source (TPS) storage ring in 2019.…
View article: Digital Low Level Radio Frequency System for the Booster Ring of the Taiwan Photon Source
Digital Low Level Radio Frequency System for the Booster Ring of the Taiwan Photon Source Open
The purpose of a Low-Level Radio Frequency (LLRF) system is to control the accelerating cavity field amplitude and phase. For the Taiwan Photon Source (TPS) at NSRRC, the currently operating LLRF systems are based on analog technology. To …
View article: Dynamic Signal Analysis Based on FPGA for NSRRC DLLRF
Dynamic Signal Analysis Based on FPGA for NSRRC DLLRF Open
As DLLRF control system designs for SRF cavities have greatly matured and the FPGA technology has im-proved as well, it is possible now to think about incorporating dynamic signal analysis (DSA). Implementation of a DSA in the FPGA is desi…
View article: Energy-Savings for the TPS Booster RF System at the NSRRC in Taiwan
Energy-Savings for the TPS Booster RF System at the NSRRC in Taiwan Open
In this paper, we discuss an energy-savings control sys-tem for the Taiwan Photon Source (TPS) booster RF sys-tem. During top-up storage ring operation, a timing con-trol is activated to reduce the booster RF transmitter en-ergy consumptio…
View article: Determination of the Electron Bunch Length With Third Harmonic Cavity for the Taiwan Photon Source
Determination of the Electron Bunch Length With Third Harmonic Cavity for the Taiwan Photon Source Open
The Taiwan Photon Source (TPS) is a modern 3 GeV low emittance light source with RMS bunch lengths of about 3 mm at a beam current of 500 mA and operating gap voltage of 3.2 MV. With a higher harmonic cavity, we could increase the Touschek…
View article: TPS Beam Trip Analysis and Dose Distribution
TPS Beam Trip Analysis and Dose Distribution Open
Failure analysis during TPS users operation is im-portant to improve the performance of the TPS storage ring. In this report, we discuss the particular radiation dose patterns, relevant to different beam trips, and the development of a too…
View article: Quarter wavelength combiner for an 8.5kW solid state amplifier and conceptual study of hybrid combiners
Quarter wavelength combiner for an 8.5kW solid state amplifier and conceptual study of hybrid combiners Open
Experimental results to combine ten 900W solid state amplifier modules based on typical quarter wavelength 10-way combiners are described for a total of 8.5kW RF power output at 500 MHz. The power gain and phase distribution among the ten …
View article: Upgrade of the Existing PID Controller and Oxygen Detection Alarm System for SRF Modules Operating in the Taiwan Light Source
Upgrade of the Existing PID Controller and Oxygen Detection Alarm System for SRF Modules Operating in the Taiwan Light Source Open
A Cornell-type superconducting RF cavity module was installed in the Taiwan Light Source (TLS) in 2004. New control electronics for the existing SRF modules have been designed, based on the original designs. In addition to the functions fo…
View article: Input Output Controller of Digital Low Level RF System in NSRRC
Input Output Controller of Digital Low Level RF System in NSRRC Open
Low Level Radio Frequency (LLRF) systems operating at NSRRC are based on analog technology and are used both at the Taiwan Light Source and the Taiwan Photon Source. In order to have better RF field stability, a new digital LLRF system bas…
View article: DIGITAL LOW LEVEL RF CONTROL SYSTEM FOR THE TAIWAN PHOTON SOURCE
DIGITAL LOW LEVEL RF CONTROL SYSTEM FOR THE TAIWAN PHOTON SOURCE Open
The Taiwan Photon Source (TPS) is a 3 GeV, 500 mA, 499.65 MHz, 3rd generation synchrotron light source at NSRRC. To achieve the requirements of system flexibil-ity, fault diagnosis, precise control and high noise reduc-tion, a digital low …
View article: Quarter Wavelength Combiner for an 8.5kW Solid-State Amplifier and Conceptual Study of Hybrid Combiners
Quarter Wavelength Combiner for an 8.5kW Solid-State Amplifier and Conceptual Study of Hybrid Combiners Open
Experimental results to combine ten 900 W solid-state amplifier modules based on typical quarter wavelength 10-way combiners are described for a total of 8.5 kW RF power output at 500 MHz. The power gain and phase distribution among the te…
View article: Strategy Towards Non-Interrupted Operation of Superconducting Radio Frequency Modules at NSRRC
Strategy Towards Non-Interrupted Operation of Superconducting Radio Frequency Modules at NSRRC Open
Two modern 3rd generation light sources, the well-developed 1.5-GeV Taiwan Light Source (TLS) and the new constructed 3-GeV Taiwan Photon Source (TPS), are now in routine operation. Both storage rings are powered by the superconducting RF …
View article: The Study of Electromagnet Compensated High Power Ferrite Circulator Operation With Superconducting RF Cavity
The Study of Electromagnet Compensated High Power Ferrite Circulator Operation With Superconducting RF Cavity Open
In a high power RF system for accelerator application, the circulator is very important for protecting klystron or IOT from damage due to high reflection power from the cavity. When there is no beam current passing through the superconduct…
View article: Development of a 500 MHz Solid-state RF Amplifier as a Combination of Ten Modules
Development of a 500 MHz Solid-state RF Amplifier as a Combination of Ten Modules Open
The recent development of semiconductor technology has proved that a solid-state RF amplifier is an attractive alternative high-power RF source for numerous accelera-tor applications. Because of the great redundancy and reliability of soli…
View article: Design and Upgrade the Safety System for the SRF Electronic System at the Taiwan Photon Source
Design and Upgrade the Safety System for the SRF Electronic System at the Taiwan Photon Source Open
This paper presents some new designs and upgrades of a SRF interlock and electronic system. Based on the experience from Taiwan Light Source (TLS) that uses one Cornell-type superconducting cavity made by ACCEL in the storage-ring RF syste…
View article: Realization of a System to Monitor Water Quality and for Cooling a TPS KEKB Superconducting Cavity CPL/HOM
Realization of a System to Monitor Water Quality and for Cooling a TPS KEKB Superconducting Cavity CPL/HOM Open
Taiwan Photon Source (TPS) is a 3GeV synchrotron accelerator and is built next to the present Taiwan Light Source (TLS) [1]. The stability of electron beam is pro-vided by Low-level RF control system for keeping Gap voltage and phase to be…