| 摘要 |
PURPOSE:To make energy variable while reducing power leakage by a method in which when detuning the prescribed combination cabities of a standing wave acceleration tube, said combination cavities are formed while being provided with a detuning rod, which makes said combination cavities to contact with the cylindrical surface on the opposite side while crossing the post part. CONSTITUTION:A side cavity combination type standing wave acceleration tube is formed including a beam pass hole 6, a microwave power supply waveguide 5, acceleration cavities A1-A30, combination cavities S1-S29, a gap G for forming an electric field etc. And, when making the microwave power not to be propagated to the acceleration cavities A16-A30 in the rear by detuning the combination cavity S15, the combination cavity S15 is so constituted that a detuning rod 11 may be made to pass the post part 10 and to be inserted into and brought in contact with the hole 13 provided on the cylindrical surface 9 on the opposite while forming the contact end part 12 as a metal different from the metal forming the cylindrical surface 9. Accordingly, when energy is made variable, a low energy beam can be effectively obtained due to reduced leakage power.
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