CDR (Conceptual Design Report) lattice aperture limitations due to magnetic imperfections in the IR quadrupole triplets

Technical Report · Sun Feb 01 04:00:00 EST 1987

DOI:https://doi.org/10.2172/6732940· OSTI ID:6732940

Leemann, B T

The effect of magnetic imperfections in the arc dipole magnets on the linear and dynamic aperture of a variety of test-lattices has been explored in a number of particle tracking studies. These results have been incorporated in the conceptual Design Report and contributed to establish tolerances for the arc dipole magnet imperfections. Sorting and/or binning of the magnets according to a particular multipole moment proved most effective. The importance of the IR quadrupole imperfections to the dynamic aperture due to the large {Beta} - function values at their locations was first documented in tracking studies by Dell and Schachinger. In the present report we explore the dependence of the linear and dynamic apertures on lattice parameters such as the {Beta} - function value {Beta}* and the crossing angle {alpha} at the interaction points in the low-{Beta} IRs for the nominal IR quad triplet multipole errors. Furthermore, the sensitivity of the dynamic aperture to the number of corrected multipole orders, to the residual multipole strengths and to the strengths of the higher, uncorrected multipole moments is examined. It should be understood, that the rms-values of the magnetic multipoles moments are implied, whenever we refer to multipole errors''. 10 refs., 11 figs., 1 tab.

• Research Organization: Lawrence Berkeley Lab., CA (USA). SSC Central Design Group
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-89ER40486
• OSTI ID: 6732940
• Report Number(s): SSC-109; ON: DE90014040
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430100 -- Particle Accelerators-- Design
Development
& Operation
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
APERTURES
BEAM DYNAMICS
BEAM OPTICS
BEAM-BEAM INTERACTIONS
DIPOLES
ERRORS
MAGNETIC DIPOLES
MULTIPOLES
OPENINGS
PARTICLE TRACKS
STORAGE RINGS
SUPERCONDUCTING SUPER COLLIDER