| 摘要 |
Disclosed embodiments include an energy degrader for attenuating the energy of a charged particle beam. The energy degrader may include a first energy attenuation member presenting a annular beam entry face and a continuous helical beam exit face, a second energy attenuation member presenting a continuous helical beam entry face and an annular beam exit face. The first and second helical surfaces may face each other. The energy degrader may also include a drive assembly configured for rotating the first and the second energy attenuation members around respectively a first axis and a second axis which are parallel to each other. The degrader may have a small moment of inertia, allowing more accurate and faster variation of the beam energy. |
