RFQ ELECTRODE FOR FOUR-ROD RFQ ACCELERATOR

摘要

PROBLEM TO BE SOLVED: To provide an RFQ electrode for a high ion beam acceptance 4-rod RFQ, which has high power efficiency, a high mechanical strength and high cooling efficiency, by forming a peak and a valley in a bar-like electrode having a cooling water route projectingly provided inside and specifying the radius of a beam passage space, the curvature of the peak and a distance between the peak and a bottom surface. ;SOLUTION: Four bar-like electrodes made of equal-value copper or the like are fixed in the position of the apex of a square, and electrode pairs on a counter electrode line are connected with each other. Peaks and valleys are formed in the longitudinal directions of the electrodes, and the peaks and the valleys of the electrodes adjacent to each other are made corresponsive. A high frequency voltage is applied between the adjacent electrodes, and ion beams introduced to the four electrodes are accelerated. In the RFQ electrode 1 of this 4-rod RFQ accelerator, a cooling water route 2 is formed in the longitudinal direction of the RFQ electrode 1 for forming the beam passage space 9 of a radius R₁=5 to 9 mm, a curvature R₂ in a direction orthogonal to the axis of a peak 3 is set to 5 to 9 mm, and H/R₁ wherein a distance H between the apex of the peak 3 and a bottom surface 6 is divided by R₁ is set to 4 to 6.;COPYRIGHT: (C)1998,JPO