ION ACCELERATION METHOD, ION ACCELERATION DEVICE, ION BEAM IRRADIATION DEVICE AND MEDICAL ION BEAM IRRADIATION DEVICE

摘要

PROBLEM TO BE SOLVED: To stably provide an ion beam with high directivity and high energy using a laser drive type acceleration mechanism.

SOLUTION: A laser beam 20 is emitted from a laser light source and is condensed in cluster gas 30. A nozzle 40 is installed in a vacuum, and can eject gas into the vacuum from its tip. The gas is a mixed gas of helium and carbon dioxide, and becomes the cluster gas 30 due to a sharp temperature decline caused by the adiabatic expansion when the gas is ejected into the vacuum. In the cluster gas 30, CO2clusters 32 formed after a number of CO2molecules are agglomerated and nanoparticulated are dispersed in the gas including He atoms 31. Preferably, a condensation point is set to be at the back of the inside of the cluster gas 30. The position of 80-100% of an opening viewed from the near side in which the peak of high energy electron generation is exceeded and in which a bubble structure is created while X-ray is generated is most preferable.

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