Vertical dispersion produced by random closed orbit distortions and sextupoles

Technical Report · Thu Nov 10 04:00:00 EST 1977

OSTI ID:6544637

Suzuki, Toshio

Vertical dispersion appears even in a machine designed with plane symmetry because of vertical closed orbit distortions, linear coupling and coupling due to sextupoles. This gives rise to several undesirable effects in an electron-positron storage ring such as PEP. Vertical dispersion at the interaction point will increase beam height and reduce luminosity. Vertical dispersion around the ring will modify vertical emittance and partition numbers for synchrotron radiation damping. It will also induce betatron-synchrotron resonance and affect chromaticity correction. Vertical dispersion due to random closed orbit distortions and sextupoles has been studied by Piwinski, and he has indicated that correction of chromaticity and chromatic change of ..beta..-function is important. However, he has assumed one error element and evaluated the dispersion at the position of the element. We generalize his argument to a more realistic case and derive more precise criteria for the correction of vertical dispersion. Horizontal dispersion due to perturbations is also studied. Vertical dispersion due to linear coupling is neglected in this note, since it has been studied by other authors. 7 refs.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6544637
• Report Number(s): SLAC-PEP-NOTE-259; ON: DE89006198
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200 -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
430400* -- Particle Accelerators-- Storage Rings
BEAM DYNAMICS
BEAM EMITTANCE
BETATRON OSCILLATIONS
DIFFERENTIAL EQUATIONS
DISPERSION RELATIONS
EQUATIONS
EQUATIONS OF MOTION
HAMILTONIANS
MATHEMATICAL OPERATORS
ORBITS
OSCILLATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PEP STORAGE RINGS
QUANTUM OPERATORS
STORAGE RINGS