Compensation of aberrations in achromatic quadrupole doublets
An achromatic quadrupole lens contains an electric and a magnetic quadrupole lens operated at the proper field ratio. Using a doublet of achromatic lenses in which a quadrupole voltage may be applied to the magnetic poles of one of the lenses in order to rotate its principal section, the authors have eliminated simultaneously what may be called three first order aberrations of a quadrupole doublet. These are chromatic aberration, rotational misorientation, and focus. By adding suitably chosen small potentials to the quadrupole excitation of an electric lens, 2nd order parasitic aberration may be compensated. Experimental procedure for compensation is described. The procedure appears capable of improvement, and further work is warranted. Currently a beam of 600 keV protons with a width of 0.6 micron is obtained.
- Research Organization:
- Microscope Assoc, Inc., 50 Village Ave., Dedham, MA 02026
- OSTI ID:
- 5676409
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 30:2; ISSN IETNA
- Country of Publication:
- United States
- Language:
- English
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430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
BEAM FOCUSING MAGNETS
BEAM OPTICS
BEAMS
DATA
DOUBLET REACTORS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTROSTATIC LENSES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
EXCITATION
EXPERIMENTAL DATA
INFORMATION
KEV RANGE
KEV RANGE 100-1000
LENSES
LINE WIDTHS
MAGNETS
MULTIPOLES
NUCLEON BEAMS
NUMERICAL DATA
PARTICLE BEAMS
PERFORMANCE
PROTON BEAMS
QUADRUPOLES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS