| 摘要 |
PROBLEM TO BE SOLVED: To provide a quadrupole ion accumulating ring which stably accumulates ion beams without receiving disturbance of a high frequency electric field by positioning the orbit of ion beams in the bottom of pseudo-potential. SOLUTION: In a high frequency quadrupole ion accumulating ring having electrode structure comprising four ring electrodes (example: 11, 12, 13, 14) combined so that the cross section becomes quadrupole structure, and for accumulating charged particles on the inside of the electrode by applying high frequency voltage so that a quadrupole high frequency electric field is formed within the electrode, DC voltage (25: a variable DC power source) which negates the centrifugal force of an ion is superimposed between the inside ring electrode 11 of the ring electrode and the outside ring electrode 12 through high impedance wire bound means 26, 27 in order to keep the mean orbit of charged particle beams which orbit within the ring constant. |
