摘要
为获得天鹅绒阴极加电运行时的放气信息,在加速器Torch-02(电压约300kV、脉宽约6ns、电阻约100Q、频率1~300Hz)上开展了单次及重复频率下的真空兼容性实验研究。对于发射面积为28cm^2、阴阳极间距50mm、有效抽速62L/s、容积为4.6L的真空二极管-天鹅绒阴极系统,根据不同电流发射密度时的气压历史曲线,确定了单位面积上天鹅绒表面中性气体释放数目与脉冲能量的关系。通过实时记录不同频率下的气压演化,在本底气压约5×10^-3Pa、单脉冲能量约6J条件下,得到了平衡压强与重复频率的变化关系:10~100Hz时,平衡压强与重复频率近似呈线性递增;超过100Hz时,真空恶化明显,气压随频率呈超线性增长,300Hz时平衡压强已升至Pa量级。最后,针对重复频率运行时的放气特点,讨论了一种“分布式”抽气思想以改善系统有效抽速。
Outgassing characteristics of a polymer velvet cathode under single shot and repetition rate (rep-rate) operation were experimemally investigated on a pulser, Torch-02, which has an about 300 kV, adout 6 ns and 1 to 300 Hz rep-rate output. For a 10 L vacuum diode-velvet cathode system with an emission area of 28 cm^2 , an A-K gap of 50 mm and an effective pumping speed of 62 L/s, the pulse desorption profiles with different emitting current densities were obtained. According to the pressure histories, the dependence of equilibrium pressure on pulse rep-rate was presented in the condition of about 5 × 10^-3 Pa base pressure and about 6 J single pulse energy. The diode pressure for burst mode test increased almost linearly with pulse rep-rate from 10 to 100 Hz, and increased hyper-linearly with pulse rep-rate above 100 Hz, exceeding 1 Pa for 300 Hz. Besides, a distributed pumping idea was discussed to improve the transient pumping ability for a velvet cathode operated in rep-rate mode.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第3期595-599,共5页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目