Tsung‐Chi Yu
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View article: An Efficient Compact Model of Silicon-on-Insulatormosfets for Analog and Radio Frequency Circuit Design
An Efficient Compact Model of Silicon-on-Insulatormosfets for Analog and Radio Frequency Circuit Design Open
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: 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: The Protection Instrument for Cryogenic Phase Separator Pressure Relief Valve of TPS Beamline
The Protection Instrument for Cryogenic Phase Separator Pressure Relief Valve of TPS Beamline Open
TPS (Taiwan Photon Source) beamlines have operated for three years after the successful commission in 2015. Recently, the electromagnetic activated pressure relief valve of cryogenic phase separator of beamline had malfunction due to the r…
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: Diagnosis Application by Great Amount Operation Data Analysis Program for Taiwan Photon Source
Diagnosis Application by Great Amount Operation Data Analysis Program for Taiwan Photon Source Open
To find out abnormal situations of the machine for preventive maintenance or machine trip tracking or instability source diagnosis, a large amount of operating data in an accelerator is thus can be used to build a series data analysis prog…
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: 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: 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: Pressure drop of two-phase helium along long cryogenic flexible transfer lines to support a superconducting RF operation at its cryogenic test stand
Pressure drop of two-phase helium along long cryogenic flexible transfer lines to support a superconducting RF operation at its cryogenic test stand Open
The simple analytical approach with the introduction of a tolerance factor can provide not only insight into optimizing the choice of each lossy cryogenic piping element of the transfer lines in the design phase but also firm guidance for …
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: Design and Operation of the Dual Return Valves to Stabilize Helium Vessel Pressure of the SRF Module
Design and Operation of the Dual Return Valves to Stabilize Helium Vessel Pressure of the SRF Module Open
The Taiwan Photon
View article: Design and Construction of the RF Electronic System at Taiwan Photon Source
Design and Construction of the RF Electronic System at Taiwan Photon Source Open
The RF electronic system at NSRRC was made fully in house by the RF group from design through construction to completion. The first RF electronic system includes an analogue LLRF system, a step motor, and an ARC module of a Petra cavity. I…