电子冷却装置阴极激活及阴极表面温度计算
Oxide-cathode activation and surface temperature calculation of electron cooler
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摘要: 电子冷却在重离子加速器冷却储存环中用于束流冷却和累积。实验发现，电子冷却装置电子枪高压绝缘陶瓷的绝缘电阻值下降影响到电子冷却装置的正常运行。介绍了电子冷却装置的阴极更换、真空烘烤、阴极碱土金属碳酸盐的分解和阴极激活过程；在60 W的加热功率下，得到了10.6 μA／V１.5的导流系数；用灰体辐射计算的典型工作状态下电子枪氧化物阴极发射面的温度为1108 K，与实际测量的1078 K相近；阴极首次激活不完全是电子枪使用中导流系数的增长原因。Abstract: The pollution on electron gun ceramic insulation of electron cooler restricted the operation of electron cooler at HIRFL-CSR main ring. To cool and accumulate ion beam well, the pollution was cleared and a new oxidecoated cathode was assembled. The processes of cathode replacement, vacuum chamber baking-out, and thermal decomposition of coating binders and alkaline earth metal carbonates, and cathode activation are presented. The electron gun perveance of 10.6 μＡ/V1.5 was attained under the heating power of 60 W. The typical surface temperature of oxide-coated cathode that is calculated through grey-body radiation is 1 108 K which shows a comparable result to the experimental measurement 1 078 K. The perveance growth of electron gun during the electron cooler operation is also explaine
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Key words:
- cathode activation /
- cathode temperature /
- grey-body radiation /
- electron cooler
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