Performance of a volume H− ion source with a toroidal discharge chamber
Performance of a volume H− ion source with a toroidal discharge chamber
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具有环形放电室的体积 H− 离子源的性能
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
J. Alessi
中科院分区：
文献类型：
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作者：
K. Prelec;J. Alessi
设计了一种带有环形放电室的新型容量 H− 离子源。其主要特征是完全旋转对称，包括将主环形放电与中央提取室分开的圆锥形偶极场。对于这种旋转对称几何结构和标准线偶极几何结构，已经进行了 H− 产率和伴随的电子分量的测量。采用旋转对称几何结构，通过 1 cm2 孔径，H− 产量高达 30 mA，而 Ie /IH− 之比很大程度上取决于 IH− 的值，最高电流约为 20-30。测量了旋转对称几何结构的光束发射率，发现 21 mA 光束的发射率为 en (90%)≊0.094 π cm mrad。根据测得的发射度估算 H− 离子温度，得出的值约为 3.6 eV。
A new volume H− ion source with a toroidal discharge chamber has been designed. Its main feature is a full rotational symmetry, including a conically shaped dipole field separating the main toroidal discharge from the central extraction chamber. Measurements of the H− yield and the accompanying electron component have been performed, both for this rotationally symmetric geometry and for a standard line dipole geometry. With the rotationally symmetric geometry, the H− yield was up to 30 mA through an aperture of 1 cm2 , while the ratio Ie /IH− depended greatly on the value of IH− and was about 20–30 for the highest currents. The beam emittance was measured for the rotationally symmetric geometry, and was found to be en (90%)≊0.094 π cm mrad for a 21‐mA beam. An estimate of the H− ion temperature from the measured emittance gives a value of approximately 3.6 eV.