Design of HITFL injection and extraction high-voltage electrostatic deflector
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摘要: 根据兰州重离子治疗专用装置（HITFL）物理设计的要求，采用三维电磁场程序ANSYS建立HITFL环上注入引出高压静电偏转板的物理模型。模型中高压电极的倒角半径为20 mm，电极半宽度为55 mm,计算出静电偏转板物理要求区域内电场的非均匀度为-0.24%～0.24%，区间的电场集中系数为1.37（小于2），满足物理设计的要求。同时，利用了HIRFL-CSR（兰州重离子冷却储存环）工程CSRm环上注入引出高压静电偏转板物理设计的经验，HITFL环上的静电偏转板采用表面经过氧化处理的锻铝板材以满足耐压性和机械强度的要求。Abstract: According to the main parameters of Heavy Ion Therapy Facility in Lanzhou (HITFL), the physical model of injection and extraction deflector is built by ANSYS code which is a 3D program for electromagnetic field calculation. In the calculation, the fillet radius and the half width of the high voltage electrode are set to 20 mm and 55 mm respectively. From the result, the non-uniformity of electric field is from -0.24 percent to 0.24 percent, and the coefficient of electric field is 1.37(less than 2), so the design of the deflector meets physical requirement. According to the experience of CSRm deflector in HIRFL-CSR project, the deflectors of HITFL are made of wrought aluminum with surface anodic oxidation in order to meet the requirement of the resist pressure and the mechanical strength.
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