14 MeV医用电子直线加速器上270°偏转磁铁系统  

270°Bending magnet system for 14 MeV medical electron LINAC

作　　者：李泉凤[1] 邹昀 刘耀红[1] 汪富生 刘渭滨 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》1996年第6期31-35,共5页Journal of Tsinghua University(Science and Technology)

摘　　要：２７０°偏转磁铁系统是 １４ ＭｅＶ医用电子驻波直线加速器上的关键部件。通过用 ＴＲＡＮＳＰＯＲＴ—ＥＭ／ＰＣ程序和ＰＯＩＳＳＯＮ程序计算，完成了偏转磁铁样机设计方案。２７０°偏转 磁铁样机与加速管联合进行了出束试验，测试结果表明，具有 ６～１４ ＭｅＶ能量范围、不同的初 始发射度的电子束流，通过２７０°偏转磁铁系统受到消色散和聚焦作用，传输到靶点在能量１５．１ ＭｅＶ时，束流强度为３．５ｍＡ，束流斑点直径约为２ｍｍ。上述结果证明２７０°偏转磁铁系统性能完 全满足 １４ ＭｅＶ医用直线加速器放射治疗条件要求。Beam tests (on table) of 14 MeV medical electron standing wave LINAC (linear accelerator) prototype have been fulfiled satisfactorily. The 270° bending magnet system is a key component of this machine which is designed by using TRANSPOR-EM/PC code and POISSON code. 270° bending magnet prototype combined with 14 MeV electron standing wave linear acceleration tube is under beam test. Experimental results show that electron beams in an energy range of 6 - 14 MeV and different initial emittances are exposed to achromatic and focus action. When transported into target position beam current intensity is 3. 5 mA at 15. 1 MeV. Beam fleck diameter is about 2 mm. These above results demonstrate that performances of bending manget system satisfy radiotherapy condition requirements of 14 MeV medical LINAC.

关 键 词：医用加速器 偏转磁铁系统 放射治疗 直线加速器 

分 类 号：R815.6[医药卫生—放射医学]