Chih‐Yu Liao
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View article: Cryogenic permanent magnet undulator by evaporative cooling of liquid nitrogen
Cryogenic permanent magnet undulator by evaporative cooling of liquid nitrogen Open
CUT18, a cryogenic permanent magnet undulator at the Taiwan Photon Source, represents a significant advancement in undulator technology, offering enhanced flexibility, sustainability, and reliability. It uses a cooling method based on the …
View article: TPS Fast Orbit Feedback Upgrade
TPS Fast Orbit Feedback Upgrade Open
The orbit feedback system for the Taiwan Photon Source (TPS) was delivered in 2014. With the installation of an increasing number of insertion devices, a variety of wide-band disturbances are produced. In 2019, a proposal was put forth to …
View article: New controls for White Circuits power supplies for the booster synchrotron of Taiwan light source
New controls for White Circuits power supplies for the booster synchrotron of Taiwan light source Open
The controls of the White Circuits for the booster synchrotron of Taiwan Light Source (TLS) were developed in the late 1990s. That design is based on various analog circuitry to detect 10 Hz magnet amplitude and phase. The existing impleme…
View article: New event based timing system for the Taiwan Light Source
New event based timing system for the Taiwan Light Source Open
The Taiwan Light Source (TLS) is a third generation synchrotron light source that has been in operation since 1993. However, the legacy timing system is obsolete and needs to be upgraded to an event based timing system. This upgrade is int…
View article: Bunch-by-bunch transverse position measurement during injection
Bunch-by-bunch transverse position measurement during injection Open
Bunch-by-bunch systems have been developed at the Taiwan Light Source and the Taiwan Photon Source to monitor transverse position and filling patterns. The system comprises four channels with a 500 MHz sampling rate synchronized with the a…
View article: New Injection Controls Environment for the Taiwan Light Source
New Injection Controls Environment for the Taiwan Light Source Open
Taiwan Light Source (TLS) has been service for user service since 1993. Several legacy systems have recently been updated in order to remove obsolescent parts and provide higher operating efficiency. Proprietary designed timing modules wer…
View article: TLS Fast Orbit Feedback Upgrade
TLS Fast Orbit Feedback Upgrade Open
The Orbit Feedback System (OFB) at the Taiwan Light Source (TLS) was implemented two decades ago and has undergone multiple upgrades to enhance its performance. The loop bandwidth was constrained by the available hardware. The system is un…
View article: New digital low-level RF controls based on the Red Pitaya STEMlab for the TLS Linac system
New digital low-level RF controls based on the Red Pitaya STEMlab for the TLS Linac system Open
The Linac system at Taiwan Light Source (TLS) has been in operation for almost a quarter of a century and requires upgrades to improve its reliability. To achieve this, some components of the control system have been replaced with new digi…
View article: Optimization and Measurements on the Double Mini-Betay Lattice in the TPS Storage Ring
Optimization and Measurements on the Double Mini-Betay Lattice in the TPS Storage Ring Open
The Taiwan Photon Source (TPS) is capable of operating in multi-bunch and single-bunch mode. To operate in a hybrid mode as requested by users, we developed a lattice with chromaticities of 0.8/2 (ξ x /ξ y ) to provide higher single bunch …
View article: Beam motion and photon flux dips during injection at the Taiwan Photon Source
Beam motion and photon flux dips during injection at the Taiwan Photon Source Open
The Taiwan photon source (TPS) is a 3 GeV synchrotron light source now in routine operation at the NSRRC. At the beginning of beam commissioning, significant photon flux dips could be observed at injection due to a blow-up of the beam size…
View article: Reliability Improvement for the Insertion Device Control in the TPS
Reliability Improvement for the Insertion Device Control in the TPS Open
Insertion devices (ID) are essential components in third-generation synchrotron light sources, which can produce highly-brilliant, collimated and quasi-monochromatic radiation over a broad energy range for experiments. Reliable operation o…
View article: X-ray beam position monitors and their usage at the Taiwan photon source
X-ray beam position monitors and their usage at the Taiwan photon source Open
To monitor the position and stability of photon beams, X-ray beam position monitors (XBPMs) are installed in beamline frontends and beamlines for which the electronics infrastructure and its graphic user interface are described. Beam inten…
View article: Status of the TPS Control System
Status of the TPS Control System Open
Control system for the Taiwan Photon Source (TPS) has been delivered in mid-2014 to support commissioning and routine operation of the accelerator system. The TPS control system adopts EPICS toolkits as its frameworks. Various subsystems i…
View article: Current status of the TPS and its future prospects
Current status of the TPS and its future prospects Open
The Taiwan Photon Source (TPS) is a newly commissioned 3-GeV, third-generation, low emittance synchrotron light source located at the NSRRC in Hsinchu, Taiwan. Commissioning and machine conditioning of the TPS occurred between December 12,…
View article: EtherCAT Solution for the TPS Control System
EtherCAT Solution for the TPS Control System Open
The EtherCAT real-time Ethernet technology is now widely used in the field of industrial automation. This paper is to evaluate and establish the EtherCAT (Ethernet for Control Automation Technology) solution for digital and analogue I/O an…
View article: Study of Energy Saving Operation for the TLS Booster Power Supply
Study of Energy Saving Operation for the TLS Booster Power Supply Open
Operating an injector of a synchrotron light source, energy efficiency is an important issue. Dipole and quadrupoles families of the booster synchrotron for Taiwan Light Source (TLS) is resonantly excited by three White circuits at 10 Hz r…
View article: Optimization and Measurements on the Double Mini-Betay Lattice in the TPS Storage Ring
Optimization and Measurements on the Double Mini-Betay Lattice in the TPS Storage Ring Open
The Taiwan Photon Source (TPS) is capable of operat-ing in multi-bunch and single-bunch mode. To operate in a hybrid mode as requested by users, we developed a lattice with chromaticities of 0.8/2 (x/y) to provide higher single bunch cur…
View article: Diagnostic Tool For CompactPCI Crates
Diagnostic Tool For CompactPCI Crates Open
On the control system hardware platform for the Taiwan Photon Source (TPS) more than half use CompactPCI crates. If a crate malfunctions, the internal crate card will not operate properly affecting accelerator operation. If the crate, howe…
View article: Bunch Length Measurements with a Streak Camera in Low Alpha Lattice Operation at the TPS
Bunch Length Measurements with a Streak Camera in Low Alpha Lattice Operation at the TPS Open
Recently, we developed and tested a lower momentum compaction factor (low alpha) lattice at the Taiwan Photon Source (TPS). Operating in a low alpha lattice can provide picosecond bunch lengths for time-resolved research and generate coher…
View article: Application of Soc Based Applications in the TPS Control System
Application of Soc Based Applications in the TPS Control System Open
System on a chip (SoC) based system widely apply for accelerator control recently. These system with small footprint, low-cost with powerful CPU and rich interface solution to support many control applications. SoC based system running Lin…
View article: The Alarm and Downtime Analysis Development in the TLS
The Alarm and Downtime Analysis Development in the TLS Open
TLS (Taiwan light Source) is a 1.5 GeV synchrotron light source at NSRRC which has been operating for users more than twenty year. There are many toolkits that are delivered to find out downtime responsibility and processing solution. New …
View article: Control System Development of the TLS
Control System Development of the TLS Open
Control system of the 1.5 GeV Taiwan Light Source was working near 25 years. The TLS control system is a proprietary design. Limited resource allocation prevent major revise impossible. It was performed minor upgrade several times to avoid…
View article: Operation Experiences and Development of the TPS Control System
Operation Experiences and Development of the TPS Control System Open
Control system was operated near three years to support commissioning and operation of the TPS. Experiences accumulated in last three years in hardware, software have been confirmed it can fulfil its mission. Functionality and reliability …
View article: Optics Calibration and Measurement for Low Alpha Lattices in TPS Storage Ring
Optics Calibration and Measurement for Low Alpha Lattices in TPS Storage Ring Open
In order to provide short-pulse radiation for pump-probe experiments and coherent radiation for THz/IR measurements, we develop low alpha lattices to reduce the momentum compaction factor from nominal operation values 2.4*10⁻⁴ to 2.6*10-5 …
View article: Low Momentum Compaction Lattice Operation of the Taiwan Photon Source
Low Momentum Compaction Lattice Operation of the Taiwan Photon Source Open
In order to provide short bunch length for picosecond time-resolved experiments and for coherent IR/THz radiation, low momentum compaction factor (alpha) lattices have been commissioned recently at the Taiwan Photon Source (TPS). The momen…
View article: Study of 60 Hz Beam Orbit Fluctuations in the Taiwan Photon Source
Study of 60 Hz Beam Orbit Fluctuations in the Taiwan Photon Source Open
The Taiwan Photon Source is a 3 GeV synchrotron light source at NSRRC. To achieve high quality experimental results, it is important to minimize beam motion. During the installation of insertion devices and front-ends, the beam motion arou…
View article: An Updated LLRF Control System for the TLS Linac
An Updated LLRF Control System for the TLS Linac Open
The amplitude and phase of the RF field at the linear accelerator (LINAC) decides the beam quality. To study and to improve the performance of the LINAC system for Taiwan Light Source (TLS), a new design of a low-level radio-frequency (LLR…
View article: Post-Mortem System for the Taiwan Photon Source
Post-Mortem System for the Taiwan Photon Source Open
The Taiwan Photon Source (TPS), a 3-GeV third-generation synchrotron light source located in Hsinchu, is available to users since 2016. During operation, it will inevitably encounter system trips caused by beam losses. Thus, a post-mortem …
View article: Upgrade of BTS Control System for the Taiwan Light Source
Upgrade of BTS Control System for the Taiwan Light Source Open
The Taiwan Light Source (TLS) is a third generation of synchrotron light source, and it has been operated since 1993. The TLS control system is a proprietary design. It was performed minor upgrade several times to avoid obsolete of some sy…
View article: Commissioning of the Bunch-by-Bunch Transverse Feedback System for the TPS Storage Ring
Commissioning of the Bunch-by-Bunch Transverse Feedback System for the TPS Storage Ring Open
TPS finish its Phase II commissioning in December of 2015 after installation of two superconducting RF cavities and ten sets of insertion devices in mid-2015. Storage beam current up to 520 mA was achieved. Intensive insertion devices comm…