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To get micrometer spatial resolution in the study of radiation effects in solids and biological samples after high-energy heavy ion irradiation, a high energy heavy ion microbeam facility was constructed in the Institute of Modern Physics (IMP) of CAS. This facility that, locates at the TR0 station of HIRFL is designed for irradiation of targets kept both in vacuum chamber and in air[1]. As shown in Fig.1, the horizontal beam supplied by HIRFL is firstly focused at the object-slit by the primary quadrupole triplet, then is bent down to the basement by two 45° dipole magnets. The achromatic quadrupole magnet together with the two 45° bending magnets composes a symmetry achromatic configuration. The beam is restricted by a series of micro-slits and finally focused by a high-gradient quadrupole triplet (123 T/m) 3.6 m downstream of the bending magnets. This quadrupole triplet is assembled as a monoblock for vertical mounting to reduce the corresponding parasitic aberrations and alignment errors during separated quadrupole installation. This curved design eliminates most of the radiation from high energy beam at the working station of the microbeam, furthermore it facilitates the cell observation during irradiation of biological samples mounted with medium.
To get micrometer spatial resolution in the study of radiation effects in solids and biological samples after high-energy heavy ion irradiation, a high energy heavy ion microbeam facility was constructed in the Institute of Modern Physics (IMP) of CAS. This facility that, locates at the TR0 station of HIRFL is designed for irradiation of targets kept both in vacuum chamber and in air [1]. As shown in Fig.1, the horizontal beam supplied by HIRFL is located focused at the object-slit by the primary quadrupole triplet , then is bent down to the basement by two 45 ° dipole magnets. The achromatic quadrupole magnet together with the two 45 ° bending magnets composes a symmetry achromatic configuration. The beam is restricted by a series of micro-slits and finally focused by a high -gradient quadrupole triplet (123 T / m) 3.6 m downstream of the bending magnets. This quadrupole triplet is assembled as a monoblock for vertical mounting to reduce the corresponding parasitic aberrations and alignmen t errors during separated quadrupole installation. This curved design eliminates most of the radiation from high energy beam at the working station of the microbeam, furthermore it facilitates the cell observation during irradiation of biological samples mounted with medium.