SC200超导质子回旋加速器束流传输真空系统及控制设计

Design and Control of Vacuum System for SC200 Superconducting Proton Cyclotron Beam Transmission

束流传输系统真空是合肥超导质子医疗设备(SC200)的重要技术保障。研究束流传输系统真空对有效保证束流传输环境和束流最终品质,使束流在合理的偏差范围内到达治疗终端有着重要作用。SC200输运线上二极铁、四级铁、校正铁、束流阻断器和束测等部件分布密集,局部机械空间紧张。在此设计输入下,束流传输系统的真空部件和真空管结构既要有利于束流传输的品质,又要确保机械安装空间和后期设备维护的便利性。SC200超导质子回旋加速器束流传输真空系统总长约65 m,动态真空要求优于5×10^-4 Pa(局部可降低为5×10^-3 Pa)。研究结果表明,SC200超导质子回旋加速器束流传输系统真空设计满足设计输入要求。

The irregularly-shaped vacuum system was developed for the superconducting proton medical irradiation equipment(SC200),comprising the densely installed parts including the dipole/quadrupole/correction magnets and stopper/measurement/control subunits of proton-beam.The discussions focused on:i)The vacuum design of the four subunits,including the energy selectable section,constant energy section,transmission section and bending section of the proton beam;ii)The control/measurement subunits,such as the local/remote/manual/digital control algorithms;and iii)The fabrication,installation and maintenance of the vacuum system.The self-built vacuum system,65 m in total length and with a dynamic base pressure of below 5×10^-4 Pa,was tested.The results show that the self-developed SC200 transmission vacuum system satisfies well all the stringent requirements for the proton beam therapy.