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BEPCⅡ重大改造工程要求将对撞机的峰值亮度提高近百倍,并具有高积分亮度,为此必须对作为注入器的直线加速器进行重大改造,提供高能、强流、小发射度和小能散度的正负电子束,达到高注入速率(正电子50mA/min.)的要求.这对直线加速器各系统和束流调试是一个挑战.在成功建造了新电子源、新正电子源、新微波功率源、相位控制系统和束流轨道测量系统等的基础上,着重叙述了束流参数的调试结果,束流能量、能散度、发射度、传输效率均达到(或优于)设计指标.描述了束流参数稳定性的研究、改进和成功地达到稳定运行.最后简述了新建中的次谐波聚束系统,以进一步提高束流性能和注入速率.
BEPC II major renovation project requires the collider to increase the peak brightness of nearly a hundred times, and with high integral brightness, for which must be linear injector as a major transformation to provide high energy, high intensity, small emittance and small energy dispersion Of the positive and negative electron beams to achieve a high injection rate (positron 50mA / min.) This is a challenge for linear accelerator systems and beam conditioning. After the successful construction of a new electron source, a new positron source, a new microwave power Source, phase control system and beam orbit measurement system, the results of the beam parameter tuning are mainly described, and the beam energy, energy dispersion, emissivity and transmission efficiency meet (or exceed) the design specifications. The stability of the beam parameters is improved and the stable operation is successfully improved.At last, the sub-harmonic beam-forming system in the new construction is briefly introduced to further improve the beam performance and the injection rate.