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During the last two years, a series of beam parameters measurement, subsystem checkout, installation of various sensors, control program modification and hardware upgrade made the top-up injection possible in practical routine operation. Top-up injection is an operation mode in which the beam current in the storage ring is maintained above certain level by frequent injections. The routine current stability is in the range of 10-3 for long period of operation. The Top-up injection provides advantages in operation such as lower emittance, higher current, smaller coupling, smaller ID gaps, exotic bunch filling patterns, and higher bunch charge. It also provides constant thermal loading on all components in the storage ring and the optics components of beamlines, as well as constant signal to the beam position monitor. Discussions on the results of some measurements of booster and storage ring, the requirement of hardware upgrade and the summary of routine Top-up operation will be presented in this paper. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

The plan for beamlines in Phase II at Taiwan Photon Source is to construct two new BioSAXS and nano- ARPES beamlines. A highly brilliant light source can be produced with a cryogenic undulator, and many synchrotron facilities have been developed and operated with these in their storage rings. The development of a cryogenic undulator became a target for a light source in TPS phase II. A cryogenic undulator with period of length 15 mm will be made in a hybrid magnetic structure, and use PrFeB permanent-magnet materials. A maximum magnetic field 1.31 T is estimated at gap 4 mm and temperature about 100 K. The spectral performance of a TPS cryogenic undulator is presented in this paper. [ABSTRACT FROM AUTHOR]

The design of the vacuum system at the 3 GeV Taiwan Photon Source (TPS) is described. A localized pumping configuration of the bending chambers (B-chamber) and the injection section of the storage ring is adopted to confine and evacuate the photon-stimulated desorption from the absorbers induced by synchrotron light. The photon absorbers are carefully designed to reduce the photoelectron yield and to protect the downstream components. Non-evaporable getter (NEG) strips are installed inside the insertion device chambers (ID-chamber) to increase the linear pumping speed to solve the conductance-limit problem. Monte Carlo and iterative simulation programs are utilized to calculate the pressure profiles in both the bending section and the straight section to optimize the location of the vacuum pumps. The simulation results show that the pressure satisfies the requirement (< 1 × 10-9 torr) for a 10-hour beam lifetime at 3 GeV, 400 mA after a conditioning time of 100 Ah. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

The conceptual design of the vacuum systems for the electron storage ring of the Taiwan Photon Source (TPS) is described. The vacuum system for the synchrotron light source not only meets the specifications of an electron beam energy of 3 GeV and a beam current at 400 mA but also provides a safety factor of ∼ 1.7 (or 3.3 GeV and 500 mA) at the upper bound. The vacuum system for the storage ring is built with consideration of the following factors: (1) Sustaining the ultrahigh vacuum (UHV), (2) Highly stable vacuum system with vibration level < 0.5 μm, (3) Vacuum chambers with low impedance, (4) Thermal absorbers, and (5) Highly reliable vacuum system with least trip rate, etc. to ensure the stability of the circulating low emittance electron beam. The aluminum alloys are selected for the vacuum chambers to meet the design requirements. The concept of the design will be described. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]