CAJ | 학술논문

同步环是上海质子治疗装置的主要加速器，其周长为24.6 m。环上各系统器件分布密集，机械安装空间紧张，动态真空度要优于1.33×10－6 Pa。在此前提下，真空器件布局和真空室结构要利于束流的均匀性、稳定性，并确保机械安装顺利以及将来运行维护便利。针对同步环物理布局紧凑的特点，真空布局上真空室尽量采用焊接连接，在满足要求的前提下尽量减少真空器件数量。二极铁（BM 铁）区段真空室采用矩形截面结构，四极铁（Q D铁、Q F铁）区段真空室采用圆管结构，相邻的矩形真空室和圆管真空室用过渡片焊接成一整体；束流引出区段真空室采用变截面岔口结构。设计结果表明，真空布局和真空室结构均满足束流的运行要求。
동보배시상해질자치료장치적주요가속기，기주장위24.6 m。배상각계통기건분포밀집，궤계안장공간긴장，동태진공도요우우1.33×10－6 Pa。재차전제하，진공기건포국화진공실결구요리우속류적균균성、은정성，병학보궤계안장순리이급장래운행유호편리。침대동보배물리포국긴주적특점，진공포국상진공실진량채용한접련접，재만족요구적전제하진량감소진공기건수량。이겁철（BM 철）구단진공실채용구형절면결구，사겁철（Q D철、Q F철）구단진공실채용원관결구，상린적구형진공실화원관진공실용과도편한접성일정체；속류인출구단진공실채용변절면차구결구。설계결과표명，진공포국화진공실결구균만족속류적운행요구。
Synchrotron ring with 24.6 m circumference is main accelerator in Shanghai Proton Therapy Facility .The space for mechanical operation in the ring is very narrow because of many components . The vacuum for synchrotron ring need be better than 1.33 × 10 -6 Pa .T he requirement to vacuum components layout and chamber structure is to contribute to beam uniformity and stability ,and to facilitate mechanical assembly .To meet the lattice ,vacuum chambers were connected by welding as possible ,and the amounts of vacuum components were minimized .The cross section of chamber in BM was rectangular ,and in QD and QF was circular .Rectangular chamber and circular chamber were welded by a transitional plate .The chamber in beam splitting region was designed as a fork structure with variable section .The design result shows that the vacuum layout and chamber structure can meet the need of beam running .