Chia-Mu Cheng
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View article: The Development of a FPGA Based Front End Safety Interlock System
The Development of a FPGA Based Front End Safety Interlock System Open
A front end (FE) safety interlock control system was designed to protect humans and the machine integrity during operation. Since stability and reliability are an important requirement in this system, we developed a FPGA based system to co…
View article: Erratum: “Comparative study of Ar-implanted Ti-Zr-V non-evaporable getter films on the Al-alloy substrate” [AIP Advances 8, 075025 (2018)]
Erratum: “Comparative study of Ar-implanted Ti-Zr-V non-evaporable getter films on the Al-alloy substrate” [AIP Advances 8, 075025 (2018)] Open
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View article: Comparative study of Ar-implanted Ti-Zr-V non-evaporable getter films on the Al-alloy substrate
Comparative study of Ar-implanted Ti-Zr-V non-evaporable getter films on the Al-alloy substrate Open
Original and Ar-implanted Ti-Zr-V non-evaporable getter (NEG) films were characterized using scanning electron microscope, X-ray diffractometer, electron spectroscopy for chemical analysis, and transmission electron microscopy. Similar pro…
View article: Development of the Aluminum Beam Duct for the Ultra-Low Emittance Light Source
Development of the Aluminum Beam Duct for the Ultra-Low Emittance Light Source Open
The future light source with ultra-low emittance, typically < 500 pm rad, requests the beam duct with inner aperture < 20 mm for the electron storage ring. Besides, the cross section of the beam duct must be kept smooth for lowering the im…
View article: Effect of Ozonated Water Cleaning on Photon Stimulated Desorption in a Stainless Steel Chamber
Effect of Ozonated Water Cleaning on Photon Stimulated Desorption in a Stainless Steel Chamber Open
Aluminium vacuum chambers cleaned with ozonated water show a reduction of residual carbon and lower surface outgassing rate after baking. We would like to investigate if stainless steel chambers show similar ef-fects. A stainless steel tes…
View article: Preliminary Design and Test of Damping Mechanism for Reducing Vibration of TPS SR Vacuum Chamber
Preliminary Design and Test of Damping Mechanism for Reducing Vibration of TPS SR Vacuum Chamber Open
Since flow-induced vibration of vacuum chamber effects of the stability of the electron beam storage ring in Taiwan Photon Source (TPS), a damping mechanism was designed and installed to reduce vibration. The damping mechanism is composed …
View article: Beam Cleaning of the Vacuum System of the TPS Storage Ring without Baking in Situ
Beam Cleaning of the Vacuum System of the TPS Storage Ring without Baking in Situ Open
A maintenance procedure without baking in situ has been successfully developed and applied to maintain and upgrade the TPS storage ring vacuum system to shorten the machine downtime. The data of photon-stimulated desorption(PSD) reveal tha…
View article: Measurement of the Pressure in the TPS Booster Ring
Measurement of the Pressure in the TPS Booster Ring Open
The booster ring of Taiwan Photon Source (TPS) is designed to provide full energy injection 3 GeV ramped up from 150 MeV with a small beam emittance. It is a synchrotron accelerator of circumference 496.8 m. The vacuum chamber through the …
View article: Study of the Non-evaporable Ti-Zr-V Films Grown on Different Materials
Study of the Non-evaporable Ti-Zr-V Films Grown on Different Materials Open
The non-evaporable (NEG) Ti-Zr-V films were coated on the different vacuum-chamber materials, including the extruded aluminum samples (Al), the extruded seamless stainless steel samples (S.S.), CuCrZr alloys, and oxygen-free copper (OFC) p…
View article: Chamber Upgrade for EPU48 in TPS
Chamber Upgrade for EPU48 in TPS Open
Due to high total power and power density in Taiwan Photon Source (TPS) of EPU48 (Elliptical Polarized Undulator) in double minimum sector, we fabricate a new Aluminum vacuum chamber to increase sufficient room for synchrotron radiation to…