Drift tube manufacturing method and drift tube
View Patent ↗A drift tube manufacturing method and a drift tube which can reduce cost while securing an adequate level of particle beam focusing performance. The method includes: a magnet housing stage of housing a predetermined number of permanent magnets in a housing, which has a through-hole at a center part and an annular magnet housing space on an outer circumferential side of the through-hole; a welding stage of setting a lid for covering the opening part on the opening part; and welding the lid and the housing by laser beam welding. At least a surface of the housing and a surface of the lid are formed of copper.
1. A manufacturing method of a drift tube installed in a drift-tube-type accelerator, the method comprising:
a stage of housing a predetermined number of permanent magnets in a magnet case;
a magnet housing stage of fitting the magnet case with the predetermined number of permanent magnets in a housing,
the housing having a through-hole at a center part and an annular magnet housing space on an outer circumferential side of the through-hole,
wherein the magnet case is fitting in the housing from an opening part of the annular magnet housing space into the magnet housing space; and
a welding stage of setting a lid for covering the opening part on the opening part, and welding the lid and the housing by laser beam welding,
wherein at least a surface of the housing and a surface of the lid are formed of copper.
2. The manufacturing method of a drift tube according to claim 1 , wherein
the housing includes the opening part at one end side of the through-hole, and
in the welding stage, at least an inner circumferential portion of the lid and a portion around the through-hole of the housing are welded by laser beam welding.
3. A drift tube installed in a drift-tube-type accelerator, the drift tube comprising:
a housing which has a through-hole at a center part, the housing being formed with an annular magnet housing space that has an opening part on one end side of the through-hole, the annular magnet housing space being located on an outer circumferential side of the through-hole;
a magnet case disposed in the annular magnet housing space;
a predetermined number of permanent magnets housed in the magnet case; and
a lid covering the opening part and welded to the housing,
wherein at least a surface of the housing and a surface of the lid are formed of copper, and the magnet case is fitted from the opening part into the magnet housing space.