Observations on Tune and Functions at the Atf Damping Ring
نویسندگان
چکیده
The precise measurement of the transverse tunes and their spectra is a basic demand in accelerator commissioning. It provides a simple access to lattice characterisation and validation of the optical model. This contribution describes recent improvements of the tune monitor system at the Accelerator Test Facility Damping Ring (ATF-DR) and the performance achieved. We present preliminary measurement results of beta functions, chromaticity, and dispersion on a relaxed optics with 90 degree horizontal phase advance per cell and compare these with the theoretical predictions.
منابع مشابه
Transverse Acceptance Studies at the Atf Damping Ring
The transverse acceptance of the ATF damping ring, estimated from the beam current decay and the timedependent vacuum pressure, is smaller than the design value. We have measured its dependence on sextupole settings, linear coupling, global orbit distortions, local orbit bumps, rf frequency, rf voltage, and on the working point in the tune diagram. We describe the procedure applied to infer the...
متن کاملSimulation Studies on the Vertical Emittance Growth at the Existing Atf Extraction Beamline*
Significant beam intensity-dependence of the vertical emittance growth was experimentally observed at the Accelerator Test Facility (ATF) at KEK extraction beamline. This paper presents the simulations of possible vertical emittance growth sources, particularly in the extraction channel, where the magnets are shared by both the ATF extraction beamline and its damping ring. The vertical emittanc...
متن کاملBeam Based Alignment at the Kek-atf Damping Ring*
The damping rings of a future linear collider will have demanding alignment and stability requirements in order to achieve the low vertical emittance necessary for high luminosity. The Accelerator Test Facility (ATF) at KEK has successfully demonstrated the vertical emittance below 5 pm [1] that is specified for the GLC/NLC Main Damping Rings. One contribution to this accomplishment has been th...
متن کاملLifetime Measurement of ATF Damping Ring
The purpose of the ATF darnping ring is the development of technologies for .producing a low ernittance bearn required in future linear colliders such as . .-, -_ JLC. The lifetime of the damping ring is very short (typically a few minutes). It is limited by elastic beam-gas scattering along with a srnall dynamic aperture, and by single intra-beam scattering (Touschek effect). The Touschek life...
متن کامل