Patent ID: 6239541
Filing Date: 2001-05-29
Classification: H05H

Abstract:
An RFQ accelerator in which four electrodes extending in a beam propagation direction are positioned at 90.degree. angle to one another in a cylindrical vacuum chamber, each pair of the four electrodes on a diagonal line being connected to posts, adjacent electrodes of the four electrodes facing each other on a crest portion and a trough portion formed on an electrode surface, said RFQ accelerator accelerating an ion beam guided to a beam passage spacing surrounded by the four electrodes by radio-frequency electric fields induced between adjacent electrodes,wherein a radius R.sub.1 of the beam passage spacing surrounded by the four electrodes is selected from a range of 5 mm to 9 mm, a curvature R.sub.2 of the crest portion in a direction perpendicular to an axis of the four electrodes is selected from a range of 5 mm to 9 mm, and a height H from a peak of the crest portion to a bottom surface is selected so that a ratio of H/R.sub.1 is in a range of 4 to 6.