Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1993-10-07
1995-02-14
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335213, 335299, H01F 722
Patent
active
053899075
ABSTRACT:
A method and apparatus for correcting harmonics (multipoles) in high energy particle accelerators using superconducting magnets using a pattern of superconducting bands adjacent to the accelerator magnets. In such accelerators, superconducting coils are positioned around a non-magnetic beam tube with the magnetic coils designed to guide particles, such as protons, along the tube. Magnetic field non-uniformities in the form of multipole harmonics will disrupt the beam guidance, causing particles to hit the tube walls and be lost, reducing accelerator efficiency. The negative effects of multipoles (harmonics) in such accelerators can be reduced or eliminated by positioning a non-magnetic tube bearing a pattern of longitudinal superconducting bands, connected by circumferential band segments around the exterior of the helium vessel or other suitable surface near the magnet ends. The bands are formed from a superconductor having a critical temperature above the boiling temperature of liquid nitrogen. The longitudinal bands are equally spaced and lie parallel to the beam tube axis. The bands negate the field non-uniformities generated by the unavoidable multipoles generated by the magnetic coils. Where a number of magnets from different vendors, using somewhat different materials, etc., must be used together, often different sets of magnets have different harmonic characteristics. The tunable corrector band patterns will allow these manufacturing variations to be corrected in each set. The multipole harmonic effects for each set is measured through empiric tests, and the dimensions of the corrector band patterns are selected for use with that set.
REFERENCES:
patent: 4135127 (1979-01-01), Khanna et al.
Baldi Robert W.
Gurol Husam
Barrera Raymond
Duncan John R.
General Dynamics Corporation
Gilliam Frank D.
Picard Leo P.
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