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随机冷却是一种基于带宽反馈系统对束流振荡进行衰减的冷却方法,更适合冷却较大发射度和动量分散的次级粒子束,与电子冷却互补,可以得到更高品质的束流。兰州重离子研究装置(HIRFL)目前处于冷却存储环的实验环随机冷却系统的设计和建造阶段。通过对横向Betatron振荡的模拟,得到了提高系统带宽、增加探测器(Pick-up)和冲击器(Kicker)的个数、降低系统噪声温度等对缩短冷却时间和减小冷却平衡值的重要作用。同时,分析了较大的动量分散或较大的放大器增益对Betatron振荡冷却过程产生的加热现象。
Stochastic cooling is a kind of cooling method based on the bandwidth feedback system to attenuate the beam oscillation. It is more suitable for cooling the secondary particle beam with larger emissivity and momentum dispersion, and complements the electron cooling to obtain a higher quality beam. The Lanzhou Heavy Ion Research Facility (HIRFL) is currently in the design and construction phase of a staged random cooling system for cooling storage loops. Through the simulation of transverse Betatron oscillation, the important effect of increasing the system bandwidth, increasing the number of Pick-up and Kicker, reducing the system noise temperature and so on to shorten the cooling time and reduce the cooling balance value . At the same time, the heating effect of Betatron oscillation cooling process due to large momentum dispersion or larger amplifier gain is analyzed.