• C.-C. Kuo, H.-P. Chang, H.C. Chao, M.-S. Chiu, P.J. Chou, G.-H. Luo, A. Rusanov, H.-J. Tsai, F.H. Tseng, C.H. Yang
  NSRRC, Hsinchu

Taiwan Photon Source (TPS) is a low emittance third-generation light source which is currently under construction in the NSRRC site in Taiwan. TPS consists of 24 double-bend cells and its circumference is 518.4 m. A 496.8-m booster with multi-bend structure is designed. The alternative lattices, such as high/low betax, chicanes with double-vertical-waists in the long straights, and short bunches with low momentum compactions, etc., are investigated. Orbit and coupling corrections and stability issues are studied. Touschek lifetime and effects due to insertion devices are simulated. Works on impedance estimation and instability simulations are performed.

Slides

• H.-J. Tsai, H.-P. Chang, M.-S. Chiu, P.J. Chou, C.-C. Kuo, W.T. Liu, G.-H. Luo, F.H. Tseng, C.H. Yang
  NSRRC, Hsinchu

Touschek scattering is an important beam lifetime limiting effect for the TPS storage ring due to several challenges such as low emittance, small physical aperture and large second-order momentum compaction factor (nonlinear longitudinal motion). The Touschek relevant energy acceptance is determined by these challenges, therefore a reliable estimate of the Touschek lifetime is essential. We obtained Touschek induced betatron oscillation amplitudes in three sections (LS, SS and ARC) and RF bucket acceptance analytically and with simulations. In this paper, we present the energy acceptance and Touschek lifetime calculations for the TPS storage ring in the cases for different chromaticity settings, ID chamber limitations, magnet multipole field errors and optics correction effects.

• H.C. Chao, H.-P. Chang, C.-C. Kuo, H.-J. Tsai
  NSRRC, Hsinchu

In this paper, the simulation techniques of insertion device (ID) were discussed. Piecewise hard-edge model was used to estimate the tune shift and changes of emittance and energy spread, while kick map model was used for particle tracking. Optical functions and tune shifts can also be derived by this model. Frequency maps as well as the beta-beating and its correction of Phase I IDs are demonstrated.

• M.-S. Chiu, H.-P. Chang, H.C. Chao, C.-C. Kuo, H.-J. Tsai, C.H. Yang
  NSRRC, Hsinchu

To evaluate the feasibility for installing two insertion devices in the long straight sections (12 m long) of the TPS storage ring, two different kinds of the double mini-betay optics (symmetric and asymmetric configurations) were proposed to fulfill this purpose. In the symmetric case a quadrupole triplet is located at the center of the long straight, while in the asymmetric case a quadrupole doublet is used. The effects on the beam dynamics, such as the dynamic aperture, injection efficiency, and lifetime, etc., are presented.

• F.H. Tseng, H.-P. Chang, J. Chen, P.C. Chiu, K.T. Hsu, C.-C. Kuo, H.-J. Tsai
  NSRRC, Hsinchu

Taiwan Photon Source (TPS) is the second synchrotron light source in Taiwan which is currently under construction at the NSRRC existing site. With a 3 GeV beam energy, low emittance, 24-DB structure in the storage ring, the TPS can generate higher brilliance and more abundant X-ray sources. TPS is in complementary to the overbooked 1.5 GeV Taiwan Light Source (TLS). The MATLAB-based accelerator physics application programs planned for the TPS commissioning and operation is a high-level software collection including the MML, AT, LOCO, etc., developed at ALS and SLAC. In this report, the testing results by employing this package to the Taiwan Light Source (TLS) are given and the simulations of the TPS virtual machine are also demonstrated.