A long pulse ( approximately 10 s) neutral beam injector with eight beam sources and one integrated beam-line system has been taken into operation on JET. The sources are arranged in two vertical groups. H0 beams were injected into D+ plasmas with particle energies (in the full energy fraction) of <or=65 keV. The neutral power fractions at this energy are 69%, 23% and 8% in the full, half and third energy components respectively, giving a total beam power of <or=5.5 MW injected into the torus. Most recently, D0 beam heating experiments were started with D+ plasmas. The beam particle energy was 75 keV, the injected power fractions 76%, 17% and 7% and the total power and energy into the torus 7.7 MW and 35 MJ, respectively. The data presented are mainly from the 65 keV H0 beam experiments. Experiments were performed over a wide range of plasma parameters, i.e. plasma current Ip=1-4 MA, toroidal fields Bt=1.7-3.4 T and safety factors qcyl=1.7-10.5. Beam power scans were performed by firing various numbers of beams. When possible, the density time evolution n(t) was maintained during power scans by adding gas fuelling to compensate the reduced beam fuelling at lower powers.
JET装置上已投入运行一套长脉冲（约10秒）中性束注入器，其包含八个束源和一个集成束线系统。这些束源分为两组垂直排列。H⁰束以D⁺等离子体为靶，粒子能量（全能量分量）≤65 keV。在该能量下，中性束功率在全能量、半能量和三分之一能量分量中的占比分别为69%、23%和8%，注入托卡马克的总束功率≤5.5 MW。最近，D⁰束加热实验已启动，同样以D⁺等离子体为靶。束粒子能量为75 keV，注入功率在全能量、半能量和三分之一能量分量中的占比分别为76%、17%和7%，注入托卡马克的总功率和总能量分别为7.7 MW和35 MJ。所呈现的数据主要来自65 keV H⁰束实验。实验在广泛的等离子体参数范围内进行，即等离子体电流Ip=1–4 MA，环向磁场Bt=1.7–3.4 T，安全因子qcyl=1.7–10.5。通过发射不同数量的束源来进行束功率扫描。在可能的情况下，通过增加气体加注以补偿较低功率下束流加注的减少，从而在功率扫描期间维持密度时间演化n(t)不变。