Ion cyclotron range of frequencies (ICRF) heating will be the sole auxiliary heating method on SPARC for both full-field (Bt0 ~ 12 T) D–T operation and reduced field (Bt0 ~ 8 T) D–D operation. Using the fast wave at ~120 MHz, good wave penetration and strong single-pass absorption is expected for D–T(3He), D(3He), D(H) and4He(H) heating scenarios. The dependences of wave absorption on${k_\parallel }$,3He concentration, resonance location, antenna poloidal location and losses on alpha particles and ash have been studied. The antenna loading has been assessed by comparison with the Alcator C-Mod antennae. An antenna spectrum of${k_\parallel }\sim 15\text{--}18\,{\textrm{m}^{ - 1}}$is shown to be good for both core absorption and edge coupling. For the control of impurity sources, the antenna straps are rotated ~10° to be perpendicular to the B field and the straps can run with different power levels in order to optimize the antenna spectrum and to minimize the image current on the antenna frame. Combining the physics constraints with the SPARC port design, maintenance requirement and contingency against antenna failure during D–T operation, we plan to mount on the inner wall of the vacuum vessel a total of 12 4-strap antennae in 6 ports while keeping 3-strap antennae that are insertable and removable on port plugs as the backup option.

中文翻译：

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SPARC托卡马克ICRF系统的物理基础

离子回旋加速器频率范围 (ICRF) 加热将是 SPARC 上唯一的辅助加热方法，适用于全场 (乙吨0~ 12 T) D–T 操作和缩小场 (乙吨0~ 8 T) D-D 操作。使用 ~120 MHz 的快波，预计 D-T 具有良好的波穿透性和强的单程吸收（3他), D(3他), D(H) 和4He(H) 加热场景。波吸收的依赖性${k_\平行}$,3研究了α粒子和灰烬的浓度、共振位置、天线极向位置和损耗。已通过与 Alcator C-Mod 天线的比较来评估天线负载。天线频谱${k_\parallel }\sim 15\text{--}18\,{\textrm{m}^{ - 1}}$被证明对核心吸收和边缘耦合都有好处。为了控制杂质源，天线带旋转约 10° 以垂直于 B 场，并且带可以以不同的功率水平运行，以优化天线频谱并最小化天线框架上的镜像电流。将物理限制与 SPARC 端口设计、维护要求和 D-T 操作期间天线故障的应急措施相结合，我们计划在真空容器的内壁上安装总共 12 个 4 带天线的 6 个端口，同时保持 3-作为备用选项，可在端口插头上插入和拆卸的带状天线。