Undulator-based positron source is adopted as the ILC baseline design. Complete optics to transport the positron beam having large angular divergence and large energy spread from an immersed thin Ti target to the entrance of the 5 GeV damping ring injection line is developed. Start-to-end multi-particle tracking through the beamline is performed including the optical matching device, capture system, transport system, superconducting booster linac, spin rotators, and energy compressor. It shows that 49.8% ring injection line. The field and alignment errors and orbit correction are analyzed. 1
A train of 2-ns micro bunches of longitudinally polarized electrons are generated in a 120-kV DC-gun based injector in the ILC electron source; a bunching system with extremely high bunching efficiency to compress the micro-bunch down to 20 ps FWHM is designed. Complete optics to transport the electron bunch to the entrance of the 5-GeV damping ring injection line is developed. Start-to-end multi-particle tracking through the beamline is performed including the bunching system, pre-acceleration, chicane, 5-GeV superconducting booster linac, spin rotators and energy compressor. It shows that 94% of the electrons from the DC-gun are captured within the damping ring 6-D acceptance − 09 AbstractA train of 2-ns micro bunches of longitudinally polarized electrons are generated in a 120-kV DC-gun based injector in the ILC electron source; a bunching system with extremely high bunching efficiency to compress the micro-bunch down to 20 ps FWHM is designed. Complete optics to transport the electron bunch to the entrance of the 5-GeV damping ring injection line is developed. Start-to-end multi-particle tracking through the beamline is performed including the bunching system, pre-acceleration, chicane, 5-GeV superconducting booster linac, spin rotators and energy compressor. It shows that 94% of the electrons from the DC-gun are captured within the damping ring 6-D acceptance − 09 . 0 ≤ + y
After considerable deliberation, we have determined the location of the linac and damping ring interface. This treaty point serves as a pivot about which the optica for sector one, the Linac-Tc-Ring lines, Ring-Tc-Linac lines, and sector two have been designed. The treaty location is at Z = 98.7532 m from the beginning of the SLC
Model Independent Analysis (MIA) has shown the potential to be a useful tool for diagnostics and optics verification.The Accelerator Test Facility (ATF) prototype damping ring at KEK has a diagnostic system with the ability to collect data allowing the application of MIA for analysis of the injection stability, and the storage ring optics and diagnostics. Understanding of all these issues will be important for improving the operational performance of a damping ring. We report here the results of a first attempt to apply MIA to the ATF. MODEL INDEPENDENT ANALYSISThe basic technique of Model Independent Analysis [1] is a decomposition of a matrix constructed from BPM readings, which reveals correlations between the signals at the various BPMs. A set of signals from all the BPMs in a given beamline over a number of bunch passages will have correlated components arising, for example, from betatron motion of the bunch, variations in bunch charge, and energy errors; and uncorrelated components arising, for example, from BPM noise.An "orbit vector" may be constructed from the BPM signals taken during a single bunch passage. Horizontal and vertical data are combined into a single vector; other variables possibly correlated to the BPM signals, such as the bunch charge, may be added as additional components. We may then construct a matrix M with rows composed of orbit vectors from a number of successive bunch passages. Singular value decomposition (SVD) of this matrix provides us with matrices u, w, and v such that:I is the identity matrix, and w is diagonal. We refer to the elements of w as the eigenvalues of M, and to rows of v as "modes". The matrix v contains correlations between different components of the orbit vectors, in that any orbit vector may be reconstructed by a linear superposition of the modes.The power of MIA lies in the ability to reveal correlations between BPM signals, and in this respect, nothing needs to be known about the optical properties of the beamline. However, the technique may be extended to verify the beamline optics, since a large number of orbits will allow a very precise determination of the betatron and dispersion modes. KEK ATFThe Accelerator Test Facility (ATF) at KEK is a prototype damping ring for future linear colliders. The storage ring is a racetrack lattice, with circumference 139 m and nominal energy 1.54 GeV. One of the objectives of the ATF is to demonstrate the performance that will be required of damping rings for a future linear collider, in terms of low emittance and injection efficiency. To achieve these goals, a good understanding of the diagnostics system, injection errors and the condition of the storage ring lattice will be crucial, and MIA has the potential to provide important relevant information. For the present investigation, we collected data from 7000 orbits, over a period of four hours during a shift in December 2001. Ultimately, we hope to use MIA to perform detailed checks of the optics, but our initial goals were simply to verify the technique in id...
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