BEAM MEASUREMENT SYSTEM OF VEPP-2000 INJECTION CHANNELS

The paper presents single-flight beam diagnostic system for VEPP-2000 injection channels. The system includes two types of beam position monitors: secondary emission monitors and image current monitors. Tuning of the system, calibration of monitors, hardware and software of the diagnostic system are described. Main goal of the beam diagnostic system is providing lossless beam transport. To solve such problem one needs to tune up as guide fields as focusing fields of transportation channels. First task- trajectory correction-is solved with response matrix inversion by SVD method. Second task- optic function reconstruction- is solved with help of multidimensional fitting of channel magnet structure parameters with minimization mean-square deviation of modelled response matrix from measured one. The paper presents results of practical experience with automated beam transfer and optic functions tuning of injection channels of VEPP-2000 complex. OVERVIEW Tuning of transportation channels and beam injection system was an important stage of commissioning of the new accelerator complex VEPP-2000. Injection channels have complicated 3-dimmensional geometry (fig.1). They have 15 m length and 6 mm vertical physical aperture. The beams, stored in the booster, are injected to the collider by the one-turn injection method in horizontal plane to the straight section with zero dispersion function. Both DC (big dipoles of achromatic rotations) and pulsed (lenses and inlet/outlet dipoles) magnets (fig.2) are used in channel's optics