Measurement of the high energy component of the x-ray spectra in the VENUS electron cyclotron resonance ion source.
Measurement of the high energy component of the x-ray spectra in the VENUS electron cyclotron resonance ion source.
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DOI：
10.1063/1.2821137
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发表时间：
2008-02
期刊：
影响因子：
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通讯作者：
D. Leitner;J. Benitez;C. Lyneis;D. Todd;T. Ropponen;J. Ropponen;H. Koivisto;S. Gammino
中科院分区：
文献类型：
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作者：
D. Leitner;J. Benitez;C. Lyneis;D. Todd;T. Ropponen;J. Ropponen;H. Koivisto;S. Gammino
高性能电子回旋共振（ECR）离子源，如VENUS（核科学通用ECR），产生大量的x射线。通过研究它们的能谱，可以得出电子加热过程和电子约束的结论。此外，来自等离子体腔的轫致辐射部分被超导磁体的冷质量吸收，给低温恒温器增加了额外的热负荷。锗或NaI探测器通常用于x射线测量。由于来自ECR离子源的高x射线通量，测量来自ECR离子源的轫致辐射光谱的实验装置与这些探测器通常用于传统核物理测量的实验装置有所不同。特别是，准直和背景屏蔽可能会有问题。在本文中，我们将讨论这种测量的实验设置，能量校准和背景降低，探测器的屏蔽，以及x射线通量的准直。我们将给出x射线能谱和低温恒温加热速率取决于不同的离子源参数，如约束场、最小b场、射频功率和加热频率。
High performance electron cyclotron resonance (ECR) ion sources, such as VENUS (Versatile ECR for NUclear Science), produce large amounts of x-rays. By studying their energy spectra, conclusions can be drawn about the electron heating process and the electron confinement. In addition, the bremsstrahlung from the plasma chamber is partly absorbed by the cold mass of the superconducting magnet, adding an extra heat load to the cryostat. Germanium or NaI detectors are generally used for x-ray measurements. Due to the high x-ray flux from the source, the experimental setup to measure bremsstrahlung spectra from ECR ion sources is somewhat different from that for the traditional nuclear physics measurements these detectors are generally used for. In particular, the collimation and background shielding can be problematic. In this paper, we will discuss the experimental setup for such a measurement, the energy calibration and background reduction, the shielding of the detector, and collimation of the x-ray flux. We will present x-ray energy spectra and cryostat heating rates depending on various ion source parameters, such as confinement fields, minimum B-field, rf power, and heating frequency.